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v3.1
   1VERSION = 3
   2PATCHLEVEL = 1
 
   3SUBLEVEL = 0
   4EXTRAVERSION =
   5NAME = "Divemaster Edition"
   6
   7# *DOCUMENTATION*
   8# To see a list of typical targets execute "make help"
   9# More info can be located in ./README
  10# Comments in this file are targeted only to the developer, do not
  11# expect to learn how to build the kernel reading this file.
  12
  13# Do not:
  14# o  use make's built-in rules and variables
  15#    (this increases performance and avoids hard-to-debug behaviour);
  16# o  print "Entering directory ...";
  17MAKEFLAGS += -rR --no-print-directory
  18
  19# Avoid funny character set dependencies
  20unexport LC_ALL
  21LC_COLLATE=C
  22LC_NUMERIC=C
  23export LC_COLLATE LC_NUMERIC
 
  24
  25# We are using a recursive build, so we need to do a little thinking
  26# to get the ordering right.
  27#
  28# Most importantly: sub-Makefiles should only ever modify files in
  29# their own directory. If in some directory we have a dependency on
  30# a file in another dir (which doesn't happen often, but it's often
  31# unavoidable when linking the built-in.o targets which finally
  32# turn into vmlinux), we will call a sub make in that other dir, and
  33# after that we are sure that everything which is in that other dir
  34# is now up to date.
  35#
  36# The only cases where we need to modify files which have global
  37# effects are thus separated out and done before the recursive
  38# descending is started. They are now explicitly listed as the
  39# prepare rule.
  40
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  41# To put more focus on warnings, be less verbose as default
  42# Use 'make V=1' to see the full commands
  43
  44ifeq ("$(origin V)", "command line")
  45  KBUILD_VERBOSE = $(V)
  46endif
  47ifndef KBUILD_VERBOSE
  48  KBUILD_VERBOSE = 0
  49endif
  50
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  51# Call a source code checker (by default, "sparse") as part of the
  52# C compilation.
  53#
  54# Use 'make C=1' to enable checking of only re-compiled files.
  55# Use 'make C=2' to enable checking of *all* source files, regardless
  56# of whether they are re-compiled or not.
  57#
  58# See the file "Documentation/sparse.txt" for more details, including
  59# where to get the "sparse" utility.
  60
  61ifeq ("$(origin C)", "command line")
  62  KBUILD_CHECKSRC = $(C)
  63endif
  64ifndef KBUILD_CHECKSRC
  65  KBUILD_CHECKSRC = 0
  66endif
  67
  68# Use make M=dir to specify directory of external module to build
  69# Old syntax make ... SUBDIRS=$PWD is still supported
  70# Setting the environment variable KBUILD_EXTMOD take precedence
  71ifdef SUBDIRS
  72  KBUILD_EXTMOD ?= $(SUBDIRS)
 
 
  73endif
  74
 
 
 
 
  75ifeq ("$(origin M)", "command line")
  76  KBUILD_EXTMOD := $(M)
  77endif
  78
  79# kbuild supports saving output files in a separate directory.
  80# To locate output files in a separate directory two syntaxes are supported.
  81# In both cases the working directory must be the root of the kernel src.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  82# 1) O=
  83# Use "make O=dir/to/store/output/files/"
  84#
  85# 2) Set KBUILD_OUTPUT
  86# Set the environment variable KBUILD_OUTPUT to point to the directory
  87# where the output files shall be placed.
  88# export KBUILD_OUTPUT=dir/to/store/output/files/
  89# make
  90#
  91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
  92# variable.
  93
  94
  95# KBUILD_SRC is set on invocation of make in OBJ directory
  96# KBUILD_SRC is not intended to be used by the regular user (for now)
  97ifeq ($(KBUILD_SRC),)
  98
  99# OK, Make called in directory where kernel src resides
 100# Do we want to locate output files in a separate directory?
 101ifeq ("$(origin O)", "command line")
 102  KBUILD_OUTPUT := $(O)
 103endif
 104
 105ifeq ("$(origin W)", "command line")
 106  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 107endif
 108
 109# That's our default target when none is given on the command line
 110PHONY := _all
 111_all:
 112
 113# Cancel implicit rules on top Makefile
 114$(CURDIR)/Makefile Makefile: ;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 115
 116ifneq ($(KBUILD_OUTPUT),)
 117# Invoke a second make in the output directory, passing relevant variables
 118# check that the output directory actually exists
 119saved-output := $(KBUILD_OUTPUT)
 120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 121$(if $(KBUILD_OUTPUT),, \
 122     $(error output directory "$(saved-output)" does not exist))
 123
 124PHONY += $(MAKECMDGOALS) sub-make
 125
 126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 127	$(Q)@:
 128
 129sub-make: FORCE
 130	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 131	KBUILD_SRC=$(CURDIR) \
 132	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
 133	$(filter-out _all sub-make,$(MAKECMDGOALS))
 134
 135# Leave processing to above invocation of make
 136skip-makefile := 1
 137endif # ifneq ($(KBUILD_OUTPUT),)
 138endif # ifeq ($(KBUILD_SRC),)
 139
 140# We process the rest of the Makefile if this is the final invocation of make
 141ifeq ($(skip-makefile),)
 142
 143# If building an external module we do not care about the all: rule
 144# but instead _all depend on modules
 145PHONY += all
 146ifeq ($(KBUILD_EXTMOD),)
 147_all: all
 
 
 
 
 148else
 149_all: modules
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 150endif
 151
 152srctree		:= $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
 153objtree		:= $(CURDIR)
 154src		:= $(srctree)
 155obj		:= $(objtree)
 
 156
 157VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 
 
 
 
 158
 159export srctree objtree VPATH
 
 
 160
 
 
 
 
 
 
 
 
 161
 162# SUBARCH tells the usermode build what the underlying arch is.  That is set
 163# first, and if a usermode build is happening, the "ARCH=um" on the command
 164# line overrides the setting of ARCH below.  If a native build is happening,
 165# then ARCH is assigned, getting whatever value it gets normally, and 
 166# SUBARCH is subsequently ignored.
 
 
 167
 168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64 \
 169				  -e s/arm.*/arm/ -e s/sa110/arm/ \
 170				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 171				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 172				  -e s/sh[234].*/sh/ )
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 173
 174# Cross compiling and selecting different set of gcc/bin-utils
 175# ---------------------------------------------------------------------------
 176#
 177# When performing cross compilation for other architectures ARCH shall be set
 178# to the target architecture. (See arch/* for the possibilities).
 179# ARCH can be set during invocation of make:
 180# make ARCH=ia64
 181# Another way is to have ARCH set in the environment.
 182# The default ARCH is the host where make is executed.
 183
 184# CROSS_COMPILE specify the prefix used for all executables used
 185# during compilation. Only gcc and related bin-utils executables
 186# are prefixed with $(CROSS_COMPILE).
 187# CROSS_COMPILE can be set on the command line
 188# make CROSS_COMPILE=ia64-linux-
 189# Alternatively CROSS_COMPILE can be set in the environment.
 190# A third alternative is to store a setting in .config so that plain
 191# "make" in the configured kernel build directory always uses that.
 192# Default value for CROSS_COMPILE is not to prefix executables
 193# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 194export KBUILD_BUILDHOST := $(SUBARCH)
 195ARCH		?= $(SUBARCH)
 196CROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)
 197
 198# Architecture as present in compile.h
 199UTS_MACHINE 	:= $(ARCH)
 200SRCARCH 	:= $(ARCH)
 201
 202# Additional ARCH settings for x86
 203ifeq ($(ARCH),i386)
 204        SRCARCH := x86
 205endif
 206ifeq ($(ARCH),x86_64)
 207        SRCARCH := x86
 208endif
 209
 210# Additional ARCH settings for sparc
 211ifeq ($(ARCH),sparc32)
 212       SRCARCH := sparc
 213endif
 214ifeq ($(ARCH),sparc64)
 215       SRCARCH := sparc
 216endif
 217
 218# Additional ARCH settings for sh
 219ifeq ($(ARCH),sh64)
 220       SRCARCH := sh
 221endif
 222
 223# Additional ARCH settings for tile
 224ifeq ($(ARCH),tilepro)
 225       SRCARCH := tile
 226endif
 227ifeq ($(ARCH),tilegx)
 228       SRCARCH := tile
 229endif
 230
 231# Where to locate arch specific headers
 232hdr-arch  := $(SRCARCH)
 233
 234ifeq ($(ARCH),m68knommu)
 235       hdr-arch  := m68k
 236endif
 237
 238KCONFIG_CONFIG	?= .config
 239export KCONFIG_CONFIG
 240
 241# SHELL used by kbuild
 242CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 243	  else if [ -x /bin/bash ]; then echo /bin/bash; \
 244	  else echo sh; fi ; fi)
 245
 246HOSTCC       = gcc
 247HOSTCXX      = g++
 248HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
 249HOSTCXXFLAGS = -O2
 250
 251# Decide whether to build built-in, modular, or both.
 252# Normally, just do built-in.
 253
 254KBUILD_MODULES :=
 255KBUILD_BUILTIN := 1
 256
 257#	If we have only "make modules", don't compile built-in objects.
 258#	When we're building modules with modversions, we need to consider
 259#	the built-in objects during the descend as well, in order to
 260#	make sure the checksums are up to date before we record them.
 261
 262ifeq ($(MAKECMDGOALS),modules)
 263  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 264endif
 265
 266#	If we have "make <whatever> modules", compile modules
 267#	in addition to whatever we do anyway.
 268#	Just "make" or "make all" shall build modules as well
 269
 270ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 271  KBUILD_MODULES := 1
 272endif
 273
 274ifeq ($(MAKECMDGOALS),)
 275  KBUILD_MODULES := 1
 276endif
 277
 278export KBUILD_MODULES KBUILD_BUILTIN
 279export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 280
 281# Beautify output
 282# ---------------------------------------------------------------------------
 283#
 284# Normally, we echo the whole command before executing it. By making
 285# that echo $($(quiet)$(cmd)), we now have the possibility to set
 286# $(quiet) to choose other forms of output instead, e.g.
 287#
 288#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 289#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 290#
 291# If $(quiet) is empty, the whole command will be printed.
 292# If it is set to "quiet_", only the short version will be printed. 
 293# If it is set to "silent_", nothing will be printed at all, since
 294# the variable $(silent_cmd_cc_o_c) doesn't exist.
 295#
 296# A simple variant is to prefix commands with $(Q) - that's useful
 297# for commands that shall be hidden in non-verbose mode.
 298#
 299#	$(Q)ln $@ :<
 300#
 301# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 302# If KBUILD_VERBOSE equals 1 then the above command is displayed.
 303
 304ifeq ($(KBUILD_VERBOSE),1)
 305  quiet =
 306  Q =
 307else
 308  quiet=quiet_
 309  Q = @
 310endif
 
 
 311
 312# If the user is running make -s (silent mode), suppress echoing of
 313# commands
 314
 315ifneq ($(findstring s,$(MAKEFLAGS)),)
 316  quiet=silent_
 317endif
 318
 319export quiet Q KBUILD_VERBOSE
 320
 321
 322# Look for make include files relative to root of kernel src
 323MAKEFLAGS += --include-dir=$(srctree)
 324
 325# We need some generic definitions (do not try to remake the file).
 326$(srctree)/scripts/Kbuild.include: ;
 327include $(srctree)/scripts/Kbuild.include
 
 
 
 
 
 
 
 
 
 
 
 
 328
 329# Make variables (CC, etc...)
 330
 331AS		= $(CROSS_COMPILE)as
 332LD		= $(CROSS_COMPILE)ld
 333CC		= $(CROSS_COMPILE)gcc
 334CPP		= $(CC) -E
 
 
 
 
 
 
 
 
 
 
 
 
 335AR		= $(CROSS_COMPILE)ar
 336NM		= $(CROSS_COMPILE)nm
 337STRIP		= $(CROSS_COMPILE)strip
 338OBJCOPY		= $(CROSS_COMPILE)objcopy
 339OBJDUMP		= $(CROSS_COMPILE)objdump
 
 
 
 
 
 
 
 
 
 
 
 
 
 340AWK		= awk
 341GENKSYMS	= scripts/genksyms/genksyms
 342INSTALLKERNEL  := installkernel
 343DEPMOD		= /sbin/depmod
 344KALLSYMS	= scripts/kallsyms
 345PERL		= perl
 
 346CHECK		= sparse
 
 
 
 
 
 
 
 
 
 
 347
 348CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 349		  -Wbitwise -Wno-return-void $(CF)
 
 350CFLAGS_MODULE   =
 
 351AFLAGS_MODULE   =
 352LDFLAGS_MODULE  =
 353CFLAGS_KERNEL	=
 
 354AFLAGS_KERNEL	=
 355CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage
 356
 
 
 
 
 
 
 
 
 357
 358# Use LINUXINCLUDE when you must reference the include/ directory.
 359# Needed to be compatible with the O= option
 360LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include \
 361                   -Iarch/$(hdr-arch)/include/generated -Iinclude \
 362                   $(if $(KBUILD_SRC), -I$(srctree)/include) \
 363                   -include $(srctree)/include/linux/kconfig.h
 364
 
 
 
 
 
 
 
 
 365KBUILD_CPPFLAGS := -D__KERNEL__
 
 
 
 
 
 
 
 
 366
 367KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 368		   -fno-strict-aliasing -fno-common \
 369		   -Werror-implicit-function-declaration \
 370		   -Wno-format-security \
 371		   -fno-delete-null-pointer-checks
 372KBUILD_AFLAGS_KERNEL :=
 373KBUILD_CFLAGS_KERNEL :=
 374KBUILD_AFLAGS   := -D__ASSEMBLY__
 375KBUILD_AFLAGS_MODULE  := -DMODULE
 376KBUILD_CFLAGS_MODULE  := -DMODULE
 377KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 
 
 
 
 
 
 
 
 
 
 
 378
 379# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 380KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 381KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 382
 383export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 384export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 385export CPP AR NM STRIP OBJCOPY OBJDUMP
 386export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 387export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 388
 389export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 390export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 
 
 
 
 
 
 
 
 
 
 391export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 392export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 393export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 394export KBUILD_ARFLAGS
 395
 396# When compiling out-of-tree modules, put MODVERDIR in the module
 397# tree rather than in the kernel tree. The kernel tree might
 398# even be read-only.
 399export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 400
 401# Files to ignore in find ... statements
 402
 403RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
 404export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
 
 
 
 405
 406# ===========================================================================
 407# Rules shared between *config targets and build targets
 408
 409# Basic helpers built in scripts
 410PHONY += scripts_basic
 411scripts_basic:
 412	$(Q)$(MAKE) $(build)=scripts/basic
 413	$(Q)rm -f .tmp_quiet_recordmcount
 414
 415# To avoid any implicit rule to kick in, define an empty command.
 416scripts/basic/%: scripts_basic ;
 417
 418PHONY += outputmakefile
 
 
 419# outputmakefile generates a Makefile in the output directory, if using a
 420# separate output directory. This allows convenient use of make in the
 421# output directory.
 
 
 
 
 
 
 
 
 
 422outputmakefile:
 423ifneq ($(KBUILD_SRC),)
 
 
 
 
 
 
 
 
 424	$(Q)ln -fsn $(srctree) source
 425	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 426	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 
 427endif
 428
 429# Support for using generic headers in asm-generic
 430PHONY += asm-generic
 431asm-generic:
 432	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
 433	            obj=arch/$(SRCARCH)/include/generated/asm
 434
 435# To make sure we do not include .config for any of the *config targets
 436# catch them early, and hand them over to scripts/kconfig/Makefile
 437# It is allowed to specify more targets when calling make, including
 438# mixing *config targets and build targets.
 439# For example 'make oldconfig all'.
 440# Detect when mixed targets is specified, and make a second invocation
 441# of make so .config is not included in this case either (for *config).
 442
 443no-dot-config-targets := clean mrproper distclean \
 444			 cscope gtags TAGS tags help %docs check% coccicheck \
 445			 include/linux/version.h headers_% \
 446			 kernelversion %src-pkg
 447
 448config-targets := 0
 449mixed-targets  := 0
 450dot-config     := 1
 451
 452ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 453	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 454		dot-config := 0
 455	endif
 456endif
 457
 458ifeq ($(KBUILD_EXTMOD),)
 459        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 460                config-targets := 1
 461                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
 462                        mixed-targets := 1
 463                endif
 464        endif
 465endif
 466
 467ifeq ($(mixed-targets),1)
 468# ===========================================================================
 469# We're called with mixed targets (*config and build targets).
 470# Handle them one by one.
 471
 472%:: FORCE
 473	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
 474
 475else
 476ifeq ($(config-targets),1)
 477# ===========================================================================
 478# *config targets only - make sure prerequisites are updated, and descend
 479# in scripts/kconfig to make the *config target
 480
 481# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 482# KBUILD_DEFCONFIG may point out an alternative default configuration
 483# used for 'make defconfig'
 484include $(srctree)/arch/$(SRCARCH)/Makefile
 485export KBUILD_DEFCONFIG KBUILD_KCONFIG
 486
 487config: scripts_basic outputmakefile FORCE
 488	$(Q)mkdir -p include/linux include/config
 489	$(Q)$(MAKE) $(build)=scripts/kconfig $@
 490
 491%config: scripts_basic outputmakefile FORCE
 492	$(Q)mkdir -p include/linux include/config
 493	$(Q)$(MAKE) $(build)=scripts/kconfig $@
 494
 495else
 496# ===========================================================================
 497# Build targets only - this includes vmlinux, arch specific targets, clean
 498# targets and others. In general all targets except *config targets.
 499
 
 
 
 500ifeq ($(KBUILD_EXTMOD),)
 501# Additional helpers built in scripts
 502# Carefully list dependencies so we do not try to build scripts twice
 503# in parallel
 504PHONY += scripts
 505scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
 506	$(Q)$(MAKE) $(build)=$(@)
 507
 508# Objects we will link into vmlinux / subdirs we need to visit
 509init-y		:= init
 510drivers-y	:= drivers sound firmware
 511net-y		:= net
 512libs-y		:= lib
 513core-y		:= usr
 514endif # KBUILD_EXTMOD
 515
 516ifeq ($(dot-config),1)
 517# Read in config
 518-include include/config/auto.conf
 519
 520ifeq ($(KBUILD_EXTMOD),)
 521# Read in dependencies to all Kconfig* files, make sure to run
 522# oldconfig if changes are detected.
 523-include include/config/auto.conf.cmd
 524
 525# To avoid any implicit rule to kick in, define an empty command
 526$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 527
 528# If .config is newer than include/config/auto.conf, someone tinkered
 529# with it and forgot to run make oldconfig.
 530# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 531# we execute the config step to be sure to catch updated Kconfig files
 532include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 533	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 534else
 535# external modules needs include/generated/autoconf.h and include/config/auto.conf
 536# but do not care if they are up-to-date. Use auto.conf to trigger the test
 537PHONY += include/config/auto.conf
 538
 539include/config/auto.conf:
 540	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
 541	echo;								\
 542	echo "  ERROR: Kernel configuration is invalid.";		\
 543	echo "         include/generated/autoconf.h or $@ are missing.";\
 544	echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
 545	echo;								\
 546	/bin/false)
 547
 548endif # KBUILD_EXTMOD
 
 
 549
 550else
 551# Dummy target needed, because used as prerequisite
 552include/config/auto.conf: ;
 553endif # $(dot-config)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 554
 555# The all: target is the default when no target is given on the
 556# command line.
 557# This allow a user to issue only 'make' to build a kernel including modules
 558# Defaults to vmlinux, but the arch makefile usually adds further targets
 559all: vmlinux
 560
 561ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 562KBUILD_CFLAGS	+= -Os
 563else
 564KBUILD_CFLAGS	+= -O2
 
 
 
 
 
 565endif
 566
 567include $(srctree)/arch/$(SRCARCH)/Makefile
 568
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 569ifneq ($(CONFIG_FRAME_WARN),0)
 570KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 571endif
 572
 573# Force gcc to behave correct even for buggy distributions
 574ifndef CONFIG_CC_STACKPROTECTOR
 575KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 576endif
 577
 578# This warning generated too much noise in a regular build.
 579# Use make W=1 to enable this warning (see scripts/Makefile.build)
 580KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 
 
 
 
 581
 582ifdef CONFIG_FRAME_POINTER
 583KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
 
 584else
 585# Some targets (ARM with Thumb2, for example), can't be built with frame
 586# pointers.  For those, we don't have FUNCTION_TRACER automatically
 587# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 588# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 589# -fomit-frame-pointer with FUNCTION_TRACER.
 
 
 590ifndef CONFIG_FUNCTION_TRACER
 591KBUILD_CFLAGS	+= -fomit-frame-pointer
 592endif
 593endif
 594
 595ifdef CONFIG_DEBUG_INFO
 596KBUILD_CFLAGS	+= -g
 597KBUILD_AFLAGS	+= -gdwarf-2
 598endif
 599
 600ifdef CONFIG_DEBUG_INFO_REDUCED
 601KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly)
 
 
 
 
 
 602endif
 603
 604ifdef CONFIG_FUNCTION_TRACER
 605KBUILD_CFLAGS	+= -pg
 606ifdef CONFIG_DYNAMIC_FTRACE
 607	ifdef CONFIG_HAVE_C_RECORDMCOUNT
 608		BUILD_C_RECORDMCOUNT := y
 609		export BUILD_C_RECORDMCOUNT
 610	endif
 611endif
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 612endif
 613
 614# We trigger additional mismatches with less inlining
 615ifdef CONFIG_DEBUG_SECTION_MISMATCH
 616KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 617endif
 618
 619# arch Makefile may override CC so keep this after arch Makefile is included
 620NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 621CHECKFLAGS     += $(NOSTDINC_FLAGS)
 622
 623# warn about C99 declaration after statement
 624KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 
 
 
 625
 626# disable pointer signed / unsigned warnings in gcc 4.0
 627KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 628
 629# disable invalid "can't wrap" optimizations for signed / pointers
 630KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
 
 
 
 631
 632# conserve stack if available
 633KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 
 
 634
 635# use the deterministic mode of AR if available
 636KBUILD_ARFLAGS := $(call ar-option,D)
 637
 638# check for 'asm goto'
 639ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 640	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 641endif
 642
 643# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 644# But warn user when we do so
 645warn-assign = \
 646$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
 647
 648ifneq ($(KCPPFLAGS),)
 649        $(call warn-assign,CPPFLAGS)
 650        KBUILD_CPPFLAGS += $(KCPPFLAGS)
 651endif
 652ifneq ($(KAFLAGS),)
 653        $(call warn-assign,AFLAGS)
 654        KBUILD_AFLAGS += $(KAFLAGS)
 655endif
 656ifneq ($(KCFLAGS),)
 657        $(call warn-assign,CFLAGS)
 658        KBUILD_CFLAGS += $(KCFLAGS)
 
 
 659endif
 660
 661# Use --build-id when available.
 662LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 663			      $(call cc-ldoption, -Wl$(comma)--build-id,))
 664KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 665LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 666
 667ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 668LDFLAGS_vmlinux	+= $(call ld-option, -X,)
 669endif
 
 
 
 
 
 670
 671# Default kernel image to build when no specific target is given.
 672# KBUILD_IMAGE may be overruled on the command line or
 673# set in the environment
 674# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 675# this default value
 676export KBUILD_IMAGE ?= vmlinux
 677
 678#
 679# INSTALL_PATH specifies where to place the updated kernel and system map
 680# images. Default is /boot, but you can set it to other values
 681export	INSTALL_PATH ?= /boot
 682
 683#
 
 
 
 
 
 
 
 684# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 685# relocations required by build roots.  This is not defined in the
 686# makefile but the argument can be passed to make if needed.
 687#
 688
 689MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 690export MODLIB
 691
 692#
 693#  INSTALL_MOD_STRIP, if defined, will cause modules to be
 694#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 695#  the default option --strip-debug will be used.  Otherwise,
 696#  INSTALL_MOD_STRIP value will be used as the options to the strip command.
 697
 698ifdef INSTALL_MOD_STRIP
 699ifeq ($(INSTALL_MOD_STRIP),1)
 700mod_strip_cmd = $(STRIP) --strip-debug
 701else
 702mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 703endif # INSTALL_MOD_STRIP=1
 704else
 705mod_strip_cmd = true
 706endif # INSTALL_MOD_STRIP
 707export mod_strip_cmd
 708
 
 
 
 709
 710ifeq ($(KBUILD_EXTMOD),)
 711core-y		+= kernel mm fs ipc security crypto block
 712
 713vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 714		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 715		     $(net-y) $(net-m) $(libs-y) $(libs-m)))
 716
 717vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 718		     $(init-n) $(init-) \
 719		     $(core-n) $(core-) $(drivers-n) $(drivers-) \
 720		     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
 721
 722init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
 723core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
 724drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
 725net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
 726libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
 727libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
 728libs-y		:= $(libs-y1) $(libs-y2)
 729
 730# Build vmlinux
 731# ---------------------------------------------------------------------------
 732# vmlinux is built from the objects selected by $(vmlinux-init) and
 733# $(vmlinux-main). Most are built-in.o files from top-level directories
 734# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
 735# Ordering when linking is important, and $(vmlinux-init) must be first.
 736#
 737# vmlinux
 738#   ^
 739#   |
 740#   +-< $(vmlinux-init)
 741#   |   +--< init/version.o + more
 742#   |
 743#   +--< $(vmlinux-main)
 744#   |    +--< driver/built-in.o mm/built-in.o + more
 745#   |
 746#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
 747#
 748# vmlinux version (uname -v) cannot be updated during normal
 749# descending-into-subdirs phase since we do not yet know if we need to
 750# update vmlinux.
 751# Therefore this step is delayed until just before final link of vmlinux -
 752# except in the kallsyms case where it is done just before adding the
 753# symbols to the kernel.
 754#
 755# System.map is generated to document addresses of all kernel symbols
 756
 757vmlinux-init := $(head-y) $(init-y)
 758vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 759vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
 760vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 761export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 762
 763# Rule to link vmlinux - also used during CONFIG_KALLSYMS
 764# May be overridden by arch/$(ARCH)/Makefile
 765quiet_cmd_vmlinux__ ?= LD      $@
 766      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
 767      -T $(vmlinux-lds) $(vmlinux-init)                          \
 768      --start-group $(vmlinux-main) --end-group                  \
 769      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
 770
 771# Generate new vmlinux version
 772quiet_cmd_vmlinux_version = GEN     .version
 773      cmd_vmlinux_version = set -e;                     \
 774	if [ ! -r .version ]; then			\
 775	  rm -f .version;				\
 776	  echo 1 >.version;				\
 777	else						\
 778	  mv .version .old_version;			\
 779	  expr 0$$(cat .old_version) + 1 >.version;	\
 780	fi;						\
 781	$(MAKE) $(build)=init
 782
 783# Generate System.map
 784quiet_cmd_sysmap = SYSMAP
 785      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
 786
 787# Link of vmlinux
 788# If CONFIG_KALLSYMS is set .version is already updated
 789# Generate System.map and verify that the content is consistent
 790# Use + in front of the vmlinux_version rule to silent warning with make -j2
 791# First command is ':' to allow us to use + in front of the rule
 792define rule_vmlinux__
 793	:
 794	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
 795
 796	$(call cmd,vmlinux__)
 797	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 798
 799	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
 800	  echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
 801	$(cmd_sysmap) $@ System.map;                                         \
 802	if [ $$? -ne 0 ]; then                                               \
 803		rm -f $@;                                                    \
 804		/bin/false;                                                  \
 805	fi;
 806	$(verify_kallsyms)
 807endef
 808
 
 
 
 
 
 
 
 
 
 809
 810ifdef CONFIG_KALLSYMS
 811# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
 812# It's a three stage process:
 813# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
 814#   empty
 815#   Running kallsyms on that gives us .tmp_kallsyms1.o with
 816#   the right size - vmlinux version (uname -v) is updated during this step
 817# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
 818#   but due to the added section, some addresses have shifted.
 819#   From here, we generate a correct .tmp_kallsyms2.o
 820# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 821# o Verify that the System.map from vmlinux matches the map from
 822#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
 823# o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
 824#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 825#   temporary bypass to allow the kernel to be built while the
 826#   maintainers work out what went wrong with kallsyms.
 827
 828last_kallsyms := 2
 829
 830ifdef KALLSYMS_EXTRA_PASS
 831ifneq ($(KALLSYMS_EXTRA_PASS),0)
 832last_kallsyms := 3
 833endif
 834endif
 835
 836kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
 837
 838define verify_kallsyms
 839	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
 840	  echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
 841	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 842	$(Q)cmp -s System.map .tmp_System.map ||                             \
 843		(echo Inconsistent kallsyms data;                            \
 844		 echo This is a bug - please report about it;                \
 845		 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround;      \
 846		 rm .tmp_kallsyms* ; /bin/false )
 847endef
 848
 849# Update vmlinux version before link
 850# Use + in front of this rule to silent warning about make -j1
 851# First command is ':' to allow us to use + in front of this rule
 852cmd_ksym_ld = $(cmd_vmlinux__)
 853define rule_ksym_ld
 854	: 
 855	+$(call cmd,vmlinux_version)
 856	$(call cmd,vmlinux__)
 857	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 858endef
 859
 860# Generate .S file with all kernel symbols
 861quiet_cmd_kallsyms = KSYM    $@
 862      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
 863                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
 864
 865.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
 866	$(call if_changed_dep,as_o_S)
 867
 868.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
 869	$(call cmd,kallsyms)
 870
 871# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
 872.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
 873	$(call if_changed_rule,ksym_ld)
 874
 875.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
 876	$(call if_changed,vmlinux__)
 877
 878.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
 879	$(call if_changed,vmlinux__)
 880
 881# Needs to visit scripts before $(KALLSYMS) can be used.
 882$(KALLSYMS): scripts ;
 883
 884# Generate some data for debugging strange kallsyms problems
 885debug_kallsyms: .tmp_map$(last_kallsyms)
 886
 887.tmp_map%: .tmp_vmlinux% FORCE
 888	($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
 889
 890.tmp_map3: .tmp_map2
 891
 892.tmp_map2: .tmp_map1
 893
 894endif # ifdef CONFIG_KALLSYMS
 895
 896# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
 897# relevant sections renamed as per the linker script.
 898quiet_cmd_vmlinux-modpost = LD      $@
 899      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
 900	 $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
 901	 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
 902define rule_vmlinux-modpost
 903	:
 904	+$(call cmd,vmlinux-modpost)
 905	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
 906	$(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
 907endef
 908
 909# vmlinux image - including updated kernel symbols
 910vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) __KEEPMAKEFILEO__I.o $(kallsyms.o) FORCE
 911ifdef CONFIG_HEADERS_CHECK
 912	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 913endif
 914ifdef CONFIG_SAMPLES
 915	$(Q)$(MAKE) $(build)=samples
 916endif
 917ifdef CONFIG_BUILD_DOCSRC
 918	$(Q)$(MAKE) $(build)=Documentation
 919endif
 920	$(call vmlinux-modpost)
 921	$(call if_changed_rule,vmlinux__)
 922	$(Q)rm -f .old_version
 923
 924# build vmlinux.o first to catch section mismatch errors early
 925ifdef CONFIG_KALLSYMS
 926.tmp_vmlinux1: __KEEPMAKEFILEO__BA.o
 927endif
 928
 929modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
 930vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
 931	$(call if_changed_rule,vmlinux-modpost)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 932
 933# The actual objects are generated when descending, 
 934# make sure no implicit rule kicks in
 935$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
 936
 937# Handle descending into subdirectories listed in $(vmlinux-dirs)
 938# Preset locale variables to speed up the build process. Limit locale
 939# tweaks to this spot to avoid wrong language settings when running
 940# make menuconfig etc.
 941# Error messages still appears in the original language
 942
 943PHONY += $(vmlinux-dirs)
 944$(vmlinux-dirs): prepare scripts
 945	$(Q)$(MAKE) $(build)=$@
 946
 947# Store (new) KERNELRELASE string in include/config/kernel.release
 948include/config/kernel.release: include/config/auto.conf FORCE
 949	$(Q)rm -f $@
 950	$(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
 951
 
 
 
 
 
 
 952
 953# Things we need to do before we recursively start building the kernel
 954# or the modules are listed in "prepare".
 955# A multi level approach is used. prepareN is processed before prepareN-1.
 956# archprepare is used in arch Makefiles and when processed asm symlink,
 957# version.h and scripts_basic is processed / created.
 958
 959# Listed in dependency order
 960PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
 961
 962# prepare3 is used to check if we are building in a separate output directory,
 963# and if so do:
 964# 1) Check that make has not been executed in the kernel src $(srctree)
 965prepare3: include/config/kernel.release
 966ifneq ($(KBUILD_SRC),)
 967	@$(kecho) '  Using $(srctree) as source for kernel'
 968	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
 969		echo "  $(srctree) is not clean, please run 'make mrproper'";\
 970		echo "  in the '$(srctree)' directory.";\
 971		/bin/false; \
 972	fi;
 973endif
 974
 975# prepare2 creates a makefile if using a separate output directory
 976prepare2: prepare3 outputmakefile asm-generic
 977
 978prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
 979                   include/config/auto.conf
 980	$(cmd_crmodverdir)
 981
 982archprepare: prepare1 scripts_basic
 983
 984prepare0: archprepare FORCE
 985	$(Q)$(MAKE) $(build)=.
 986	$(Q)$(MAKE) $(build)=. missing-syscalls
 987
 988# All the preparing..
 989prepare: prepare0
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 990
 991# Generate some files
 992# ---------------------------------------------------------------------------
 993
 994# KERNELRELEASE can change from a few different places, meaning version.h
 995# needs to be updated, so this check is forced on all builds
 996
 997uts_len := 64
 998define filechk_utsrelease.h
 999	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1000	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1001	  exit 1;                                                         \
1002	fi;                                                               \
1003	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1004endef
1005
1006define filechk_version.h
1007	(echo \#define LINUX_VERSION_CODE $(shell                             \
1008	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL));    \
1009	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 
 
 
 
 
 
 
 
 
1010endef
1011
1012include/linux/version.h: $(srctree)/Makefile FORCE
 
 
1013	$(call filechk,version.h)
1014
1015include/generated/utsrelease.h: include/config/kernel.release FORCE
1016	$(call filechk,utsrelease.h)
1017
 
 
 
 
 
 
1018PHONY += headerdep
1019headerdep:
1020	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1021	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1022
1023# ---------------------------------------------------------------------------
 
 
 
 
1024
1025PHONY += depend dep
1026depend dep:
1027	@echo '*** Warning: make $@ is unnecessary now.'
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1028
1029# ---------------------------------------------------------------------------
1030# Firmware install
1031INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1032export INSTALL_FW_PATH
1033
1034PHONY += firmware_install
1035firmware_install: FORCE
1036	@mkdir -p $(objtree)/firmware
1037	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
 
1038
1039# ---------------------------------------------------------------------------
1040# Kernel headers
1041
1042#Default location for installed headers
1043export INSTALL_HDR_PATH = $(objtree)/usr
 
1044
1045hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 
 
 
 
1046
1047# If we do an all arch process set dst to asm-$(hdr-arch)
1048hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1049
1050PHONY += __headers
1051__headers: include/linux/version.h scripts_basic asm-generic FORCE
1052	$(Q)$(MAKE) $(build)=scripts build_unifdef
1053
1054PHONY += headers_install_all
1055headers_install_all:
1056	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057
1058PHONY += headers_install
1059headers_install: __headers
1060	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1061	$(error Headers not exportable for the $(SRCARCH) architecture))
1062	$(Q)$(MAKE) $(hdr-inst)=include
1063	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1064
1065PHONY += headers_check_all
1066headers_check_all: headers_install_all
1067	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068
1069PHONY += headers_check
1070headers_check: headers_install
1071	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1072	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1073
1074# ---------------------------------------------------------------------------
1075# Modules
1076
1077ifdef CONFIG_MODULES
1078
1079# By default, build modules as well
1080
1081all: modules
1082
1083#	Build modules
1084#
1085#	A module can be listed more than once in obj-m resulting in
1086#	duplicate lines in modules.order files.  Those are removed
1087#	using awk while concatenating to the final file.
1088
1089PHONY += modules
1090modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1091	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1092	@$(kecho) '  Building modules, stage 2.';
1093	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1094	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1095
1096modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1097	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1098
1099%/modules.builtin: include/config/auto.conf
1100	$(Q)$(MAKE) $(modbuiltin)=$*
 
 
 
 
1101
 
1102
1103# Target to prepare building external modules
1104PHONY += modules_prepare
1105modules_prepare: prepare scripts
 
 
1106
1107# Target to install modules
1108PHONY += modules_install
1109modules_install: _modinst_ _modinst_post
 
1110
1111PHONY += _modinst_
1112_modinst_:
 
 
 
 
 
 
 
 
 
 
 
 
 
1113	@rm -rf $(MODLIB)/kernel
1114	@rm -f $(MODLIB)/source
1115	@mkdir -p $(MODLIB)/kernel
1116	@ln -s $(srctree) $(MODLIB)/source
1117	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1118		rm -f $(MODLIB)/build ; \
1119		ln -s $(objtree) $(MODLIB)/build ; \
1120	fi
1121	@cp -f $(objtree)/modules.order $(MODLIB)/
1122	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1123	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1124
1125# This depmod is only for convenience to give the initial
1126# boot a modules.dep even before / is mounted read-write.  However the
1127# boot script depmod is the master version.
1128PHONY += _modinst_post
1129_modinst_post: _modinst_
1130	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1131	$(call cmd,depmod)
1132
1133else # CONFIG_MODULES
1134
1135# Modules not configured
1136# ---------------------------------------------------------------------------
1137
1138modules modules_install: FORCE
1139	@echo
1140	@echo "The present kernel configuration has modules disabled."
1141	@echo "Type 'make config' and enable loadable module support."
1142	@echo "Then build a kernel with module support enabled."
1143	@echo
1144	@exit 1
1145
1146endif # CONFIG_MODULES
1147
1148###
1149# Cleaning is done on three levels.
1150# make clean     Delete most generated files
1151#                Leave enough to build external modules
1152# make mrproper  Delete the current configuration, and all generated files
1153# make distclean Remove editor backup files, patch leftover files and the like
1154
1155# Directories & files removed with 'make clean'
1156CLEAN_DIRS  += $(MODVERDIR)
1157CLEAN_FILES +=	vmlinux System.map \
1158                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 
1159
1160# Directories & files removed with 'make mrproper'
1161MRPROPER_DIRS  += include/config usr/include include/generated          \
1162                  arch/*/include/generated
1163MRPROPER_FILES += .config .config.old .version .old_version             \
1164                  include/linux/version.h                               \
1165		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
 
 
 
 
 
1166
1167# clean - Delete most, but leave enough to build external modules
1168#
1169clean: rm-dirs  := $(CLEAN_DIRS)
1170clean: rm-files := $(CLEAN_FILES)
1171clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1172
1173PHONY += $(clean-dirs) clean archclean
1174$(clean-dirs):
1175	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 
 
1176
1177clean: archclean
1178
1179# mrproper - Delete all generated files, including .config
1180#
1181mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1182mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1183mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1184
1185PHONY += $(mrproper-dirs) mrproper archmrproper
1186$(mrproper-dirs):
1187	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1188
1189mrproper: clean archmrproper $(mrproper-dirs)
1190	$(call cmd,rmdirs)
1191	$(call cmd,rmfiles)
 
 
 
1192
1193# distclean
1194#
1195PHONY += distclean
1196
1197distclean: mrproper
1198	@find $(srctree) $(RCS_FIND_IGNORE) \
1199		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1200		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1201		-o -name '.*.rej' -o -size 0 \
1202		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1203		-type f -print | xargs rm -f
1204
1205
1206# Packaging of the kernel to various formats
1207# ---------------------------------------------------------------------------
1208# rpm target kept for backward compatibility
1209package-dir	:= $(srctree)/scripts/package
1210
1211%src-pkg: FORCE
1212	$(Q)$(MAKE) $(build)=$(package-dir) $@
1213%pkg: include/config/kernel.release FORCE
1214	$(Q)$(MAKE) $(build)=$(package-dir) $@
1215rpm: include/config/kernel.release FORCE
1216	$(Q)$(MAKE) $(build)=$(package-dir) $@
1217
1218
1219# Brief documentation of the typical targets used
1220# ---------------------------------------------------------------------------
1221
1222boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1223boards := $(notdir $(boards))
1224board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1225board-dirs := $(sort $(notdir $(board-dirs:/=)))
1226
 
1227help:
1228	@echo  'Cleaning targets:'
1229	@echo  '  clean		  - Remove most generated files but keep the config and'
1230	@echo  '                    enough build support to build external modules'
1231	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1232	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1233	@echo  ''
1234	@echo  'Configuration targets:'
1235	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1236	@echo  ''
1237	@echo  'Other generic targets:'
1238	@echo  '  all		  - Build all targets marked with [*]'
1239	@echo  '* vmlinux	  - Build the bare kernel'
1240	@echo  '* modules	  - Build all modules'
1241	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1242	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1243	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1244	@echo  '  dir/            - Build all files in dir and below'
1245	@echo  '  dir/file.[oisS] - Build specified target only'
 
 
1246	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1247	@echo  '                    (requires a recent binutils and recent build (System.map))'
1248	@echo  '  dir/file.ko     - Build module including final link'
1249	@echo  '  modules_prepare - Set up for building external modules'
1250	@echo  '  tags/TAGS	  - Generate tags file for editors'
1251	@echo  '  cscope	  - Generate cscope index'
1252	@echo  '  gtags           - Generate GNU GLOBAL index'
1253	@echo  '  kernelrelease	  - Output the release version string'
1254	@echo  '  kernelversion	  - Output the version stored in Makefile'
 
1255	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1256	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1257	 echo  ''
1258	@echo  'Static analysers'
1259	@echo  '  checkstack      - Generate a list of stack hogs'
1260	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1261	@echo  '  versioncheck    - Sanity check on version.h usage'
1262	@echo  '  includecheck    - Check for duplicate included header files'
1263	@echo  '  export_report   - List the usages of all exported symbols'
1264	@echo  '  headers_check   - Sanity check on exported headers'
1265	@echo  '  headerdep       - Detect inclusion cycles in headers'
1266	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1267	@echo  ''
1268	@echo  'Kernel packaging:'
1269	@$(MAKE) $(build)=$(package-dir) help
1270	@echo  ''
1271	@echo  'Documentation targets:'
1272	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1273	@echo  ''
1274	@echo  'Architecture specific targets ($(SRCARCH)):'
1275	@$(if $(archhelp),$(archhelp),\
1276		echo '  No architecture specific help defined for $(SRCARCH)')
1277	@echo  ''
1278	@$(if $(boards), \
1279		$(foreach b, $(boards), \
1280		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1281		echo '')
1282	@$(if $(board-dirs), \
1283		$(foreach b, $(board-dirs), \
1284		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1285		printf "  %-16s - Show all of the above\\n" help-boards; \
1286		echo '')
1287
1288	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1289	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1290	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1291	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
 
1292	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1293	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1294	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1295	@echo  '		1: warnings which may be relevant and do not occur too often'
1296	@echo  '		2: warnings which occur quite often but may still be relevant'
1297	@echo  '		3: more obscure warnings, can most likely be ignored'
 
1298	@echo  '		Multiple levels can be combined with W=12 or W=123'
1299	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1300	@echo  ''
1301	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1302	@echo  'For further info see the ./README file'
1303
1304
1305help-board-dirs := $(addprefix help-,$(board-dirs))
1306
1307help-boards: $(help-board-dirs)
1308
1309boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1310
1311$(help-board-dirs): help-%:
1312	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1313	@$(if $(boards-per-dir), \
1314		$(foreach b, $(boards-per-dir), \
1315		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1316		echo '')
1317
1318
1319# Documentation targets
1320# ---------------------------------------------------------------------------
1321%docs: scripts_basic FORCE
1322	$(Q)$(MAKE) $(build)=scripts build_docproc
1323	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1324
1325else # KBUILD_EXTMOD
1326
1327###
1328# External module support.
1329# When building external modules the kernel used as basis is considered
1330# read-only, and no consistency checks are made and the make
1331# system is not used on the basis kernel. If updates are required
1332# in the basis kernel ordinary make commands (without M=...) must
1333# be used.
1334#
1335# The following are the only valid targets when building external
1336# modules.
1337# make M=dir clean     Delete all automatically generated files
1338# make M=dir modules   Make all modules in specified dir
1339# make M=dir	       Same as 'make M=dir modules'
1340# make M=dir modules_install
1341#                      Install the modules built in the module directory
1342#                      Assumes install directory is already created
1343
1344# We are always building modules
 
1345KBUILD_MODULES := 1
1346PHONY += crmodverdir
1347crmodverdir:
1348	$(cmd_crmodverdir)
1349
1350PHONY += $(objtree)/Module.symvers
1351$(objtree)/Module.symvers:
1352	@test -e $(objtree)/Module.symvers || ( \
1353	echo; \
1354	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1355	echo "           is missing; modules will have no dependencies and modversions."; \
1356	echo )
1357
1358module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1359PHONY += $(module-dirs) modules
1360$(module-dirs): crmodverdir $(objtree)/Module.symvers
1361	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1362
1363modules: $(module-dirs)
1364	@$(kecho) '  Building modules, stage 2.';
1365	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1366
1367PHONY += modules_install
1368modules_install: _emodinst_ _emodinst_post
1369
1370install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1371PHONY += _emodinst_
1372_emodinst_:
1373	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1374	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1375
1376PHONY += _emodinst_post
1377_emodinst_post: _emodinst_
1378	$(call cmd,depmod)
1379
1380clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1381
1382PHONY += $(clean-dirs) clean
1383$(clean-dirs):
1384	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1385
1386clean:	rm-dirs := $(MODVERDIR)
1387clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1388
 
1389help:
1390	@echo  '  Building external modules.'
1391	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1392	@echo  ''
1393	@echo  '  modules         - default target, build the module(s)'
1394	@echo  '  modules_install - install the module'
1395	@echo  '  clean           - remove generated files in module directory only'
1396	@echo  ''
1397
1398# Dummies...
1399PHONY += prepare scripts
1400prepare: ;
1401scripts: ;
1402endif # KBUILD_EXTMOD
1403
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1404clean: $(clean-dirs)
1405	$(call cmd,rmdirs)
1406	$(call cmd,rmfiles)
1407	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1408		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 
 
 
 
 
 
1409		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
 
 
1410		-o -name '*.symtypes' -o -name 'modules.order' \
1411		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1412		-o -name '*.gcno' \) -type f -print | xargs rm -f
 
 
 
1413
1414# Generate tags for editors
1415# ---------------------------------------------------------------------------
1416quiet_cmd_tags = GEN     $@
1417      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1418
1419tags TAGS cscope gtags: FORCE
1420	$(call cmd,tags)
1421
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1422# Scripts to check various things for consistency
1423# ---------------------------------------------------------------------------
1424
1425PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1426
1427includecheck:
1428	find $(srctree)/* $(RCS_FIND_IGNORE) \
1429		-name '*.[hcS]' -type f -print | sort \
1430		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1431
1432versioncheck:
1433	find $(srctree)/* $(RCS_FIND_IGNORE) \
1434		-name '*.[hcS]' -type f -print | sort \
1435		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1436
1437coccicheck:
1438	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1439
1440namespacecheck:
1441	$(PERL) $(srctree)/scripts/namespace.pl
1442
1443export_report:
1444	$(PERL) $(srctree)/scripts/export_report.pl
1445
1446endif #ifeq ($(config-targets),1)
1447endif #ifeq ($(mixed-targets),1)
1448
1449PHONY += checkstack kernelrelease kernelversion
1450
1451# UML needs a little special treatment here.  It wants to use the host
1452# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1453# else wants $(ARCH), including people doing cross-builds, which means
1454# that $(SUBARCH) doesn't work here.
1455ifeq ($(ARCH), um)
1456CHECKSTACK_ARCH := $(SUBARCH)
1457else
1458CHECKSTACK_ARCH := $(ARCH)
1459endif
1460checkstack:
1461	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1462	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1463
1464kernelrelease:
1465	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1466
1467kernelversion:
1468	@echo $(KERNELVERSION)
1469
1470# Single targets
1471# ---------------------------------------------------------------------------
1472# Single targets are compatible with:
1473# - build with mixed source and output
1474# - build with separate output dir 'make O=...'
1475# - external modules
1476#
1477#  target-dir => where to store outputfile
1478#  build-dir  => directory in kernel source tree to use
1479
1480ifeq ($(KBUILD_EXTMOD),)
1481        build-dir  = $(patsubst %/,%,$(dir $@))
1482        target-dir = $(dir $@)
1483else
1484        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1485        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1486        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1487endif
1488
1489%.s: %.c prepare scripts FORCE
1490	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1491%.i: %.c prepare scripts FORCE
1492	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493%.o: %.c prepare scripts FORCE
1494	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495%.lst: %.c prepare scripts FORCE
1496	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497%.s: %.S prepare scripts FORCE
1498	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499%.o: %.S prepare scripts FORCE
1500	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501%.symtypes: %.c prepare scripts FORCE
1502	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1503
1504# Modules
1505/: prepare scripts FORCE
1506	$(cmd_crmodverdir)
1507	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1508	$(build)=$(build-dir)
1509%/: prepare scripts FORCE
1510	$(cmd_crmodverdir)
1511	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1512	$(build)=$(build-dir)
1513%.ko: prepare scripts FORCE
1514	$(cmd_crmodverdir)
1515	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1516	$(build)=$(build-dir) $(@:.ko=.o)
1517	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1518
1519# FIXME Should go into a make.lib or something 
1520# ===========================================================================
1521
1522quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1523      cmd_rmdirs = rm -rf $(rm-dirs)
1524
1525quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1526      cmd_rmfiles = rm -f $(rm-files)
1527
1528# Run depmod only if we have System.map and depmod is executable
1529quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1530      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1531                   $(KERNELRELEASE)
1532
1533# Create temporary dir for module support files
1534# clean it up only when building all modules
1535cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1536                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1537
1538a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1539	  $(KBUILD_AFLAGS_KERNEL)                              \
1540	  $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1541	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1542
1543quiet_cmd_as_o_S = AS      $@
1544cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1545
1546# read all saved command lines
1547
1548targets := $(wildcard $(sort $(targets)))
1549cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1550
1551ifneq ($(cmd_files),)
1552  $(cmd_files): ;	# Do not try to update included dependency files
1553  include $(cmd_files)
1554endif
1555
1556# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1557# Usage:
1558# $(Q)$(MAKE) $(clean)=dir
1559clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1560
1561endif	# skip-makefile
 
 
1562
1563PHONY += FORCE
1564FORCE:
1565
1566# Declare the contents of the .PHONY variable as phony.  We keep that
1567# information in a variable so we can use it in if_changed and friends.
1568.PHONY: $(PHONY)
v6.2
   1# SPDX-License-Identifier: GPL-2.0
   2VERSION = 6
   3PATCHLEVEL = 2
   4SUBLEVEL = 0
   5EXTRAVERSION =
   6NAME = Hurr durr I'ma ninja sloth
   7
   8# *DOCUMENTATION*
   9# To see a list of typical targets execute "make help"
  10# More info can be located in ./README
  11# Comments in this file are targeted only to the developer, do not
  12# expect to learn how to build the kernel reading this file.
  13
  14ifeq ($(filter undefine,$(.FEATURES)),)
  15$(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
  16endif
 
 
  17
  18$(if $(filter __%, $(MAKECMDGOALS)), \
  19	$(error targets prefixed with '__' are only for internal use))
  20
  21# That's our default target when none is given on the command line
  22PHONY := __all
  23__all:
  24
  25# We are using a recursive build, so we need to do a little thinking
  26# to get the ordering right.
  27#
  28# Most importantly: sub-Makefiles should only ever modify files in
  29# their own directory. If in some directory we have a dependency on
  30# a file in another dir (which doesn't happen often, but it's often
  31# unavoidable when linking the built-in.a targets which finally
  32# turn into vmlinux), we will call a sub make in that other dir, and
  33# after that we are sure that everything which is in that other dir
  34# is now up to date.
  35#
  36# The only cases where we need to modify files which have global
  37# effects are thus separated out and done before the recursive
  38# descending is started. They are now explicitly listed as the
  39# prepare rule.
  40
  41ifneq ($(sub_make_done),1)
  42
  43# Do not use make's built-in rules and variables
  44# (this increases performance and avoids hard-to-debug behaviour)
  45MAKEFLAGS += -rR
  46
  47# Avoid funny character set dependencies
  48unexport LC_ALL
  49LC_COLLATE=C
  50LC_NUMERIC=C
  51export LC_COLLATE LC_NUMERIC
  52
  53# Avoid interference with shell env settings
  54unexport GREP_OPTIONS
  55
  56# Beautify output
  57# ---------------------------------------------------------------------------
  58#
  59# Normally, we echo the whole command before executing it. By making
  60# that echo $($(quiet)$(cmd)), we now have the possibility to set
  61# $(quiet) to choose other forms of output instead, e.g.
  62#
  63#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  64#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  65#
  66# If $(quiet) is empty, the whole command will be printed.
  67# If it is set to "quiet_", only the short version will be printed.
  68# If it is set to "silent_", nothing will be printed at all, since
  69# the variable $(silent_cmd_cc_o_c) doesn't exist.
  70#
  71# A simple variant is to prefix commands with $(Q) - that's useful
  72# for commands that shall be hidden in non-verbose mode.
  73#
  74#	$(Q)ln $@ :<
  75#
  76# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  77# If KBUILD_VERBOSE equals 1 then the above command is displayed.
  78# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
  79#
  80# To put more focus on warnings, be less verbose as default
  81# Use 'make V=1' to see the full commands
  82
  83ifeq ("$(origin V)", "command line")
  84  KBUILD_VERBOSE = $(V)
  85endif
  86ifndef KBUILD_VERBOSE
  87  KBUILD_VERBOSE = 0
  88endif
  89
  90ifeq ($(KBUILD_VERBOSE),1)
  91  quiet =
  92  Q =
  93else
  94  quiet=quiet_
  95  Q = @
  96endif
  97
  98# If the user is running make -s (silent mode), suppress echoing of
  99# commands
 100# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
 101
 102ifeq ($(filter 3.%,$(MAKE_VERSION)),)
 103silence:=$(findstring s,$(firstword -$(MAKEFLAGS)))
 104else
 105silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS)))
 106endif
 107
 108ifeq ($(silence),s)
 109quiet=silent_
 110KBUILD_VERBOSE = 0
 111endif
 112
 113export quiet Q KBUILD_VERBOSE
 114
 115# Call a source code checker (by default, "sparse") as part of the
 116# C compilation.
 117#
 118# Use 'make C=1' to enable checking of only re-compiled files.
 119# Use 'make C=2' to enable checking of *all* source files, regardless
 120# of whether they are re-compiled or not.
 121#
 122# See the file "Documentation/dev-tools/sparse.rst" for more details,
 123# including where to get the "sparse" utility.
 124
 125ifeq ("$(origin C)", "command line")
 126  KBUILD_CHECKSRC = $(C)
 127endif
 128ifndef KBUILD_CHECKSRC
 129  KBUILD_CHECKSRC = 0
 130endif
 131
 132export KBUILD_CHECKSRC
 133
 134# Enable "clippy" (a linter) as part of the Rust compilation.
 135#
 136# Use 'make CLIPPY=1' to enable it.
 137ifeq ("$(origin CLIPPY)", "command line")
 138  KBUILD_CLIPPY := $(CLIPPY)
 139endif
 140
 141export KBUILD_CLIPPY
 142
 143# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 144# directory of external module to build. Setting M= takes precedence.
 145ifeq ("$(origin M)", "command line")
 146  KBUILD_EXTMOD := $(M)
 147endif
 148
 149$(if $(word 2, $(KBUILD_EXTMOD)), \
 150	$(error building multiple external modules is not supported))
 151
 152$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
 153	$(error module directory path cannot contain '$x')))
 154
 155# Remove trailing slashes
 156ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
 157KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
 158endif
 159
 160export KBUILD_EXTMOD
 161
 162# Kbuild will save output files in the current working directory.
 163# This does not need to match to the root of the kernel source tree.
 164#
 165# For example, you can do this:
 166#
 167#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 168#
 169# If you want to save output files in a different location, there are
 170# two syntaxes to specify it.
 171#
 172# 1) O=
 173# Use "make O=dir/to/store/output/files/"
 174#
 175# 2) Set KBUILD_OUTPUT
 176# Set the environment variable KBUILD_OUTPUT to point to the output directory.
 177# export KBUILD_OUTPUT=dir/to/store/output/files/; make
 
 
 178#
 179# The O= assignment takes precedence over the KBUILD_OUTPUT environment
 180# variable.
 181
 182# Do we want to change the working directory?
 
 
 
 
 
 
 183ifeq ("$(origin O)", "command line")
 184  KBUILD_OUTPUT := $(O)
 185endif
 186
 187ifneq ($(KBUILD_OUTPUT),)
 188# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 189# expand a shell special character '~'. We use a somewhat tedious way here.
 190abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 191$(if $(abs_objtree),, \
 192     $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 193
 194# $(realpath ...) resolves symlinks
 195abs_objtree := $(realpath $(abs_objtree))
 196else
 197abs_objtree := $(CURDIR)
 198endif # ifneq ($(KBUILD_OUTPUT),)
 199
 200ifeq ($(abs_objtree),$(CURDIR))
 201# Suppress "Entering directory ..." unless we are changing the work directory.
 202MAKEFLAGS += --no-print-directory
 203else
 204need-sub-make := 1
 205endif
 206
 207this-makefile := $(lastword $(MAKEFILE_LIST))
 208abs_srctree := $(realpath $(dir $(this-makefile)))
 
 209
 210ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 211$(error source directory cannot contain spaces or colons)
 212endif
 213
 214ifneq ($(abs_srctree),$(abs_objtree))
 215# Look for make include files relative to root of kernel src
 216#
 217# --included-dir is added for backward compatibility, but you should not rely on
 218# it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
 219MAKEFLAGS += --include-dir=$(abs_srctree)
 220endif
 221
 222ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 223# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 224# We need to invoke sub-make to avoid implicit rules in the top Makefile.
 225need-sub-make := 1
 226# Cancel implicit rules for this Makefile.
 227$(this-makefile): ;
 228endif
 229
 230export abs_srctree abs_objtree
 231export sub_make_done := 1
 232
 233ifeq ($(need-sub-make),1)
 234
 235PHONY += $(MAKECMDGOALS) __sub-make
 236
 237$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 238	@:
 239
 
 240# Invoke a second make in the output directory, passing relevant variables
 241__sub-make:
 242	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 243
 244endif # need-sub-make
 245endif # sub_make_done
 
 
 246
 247# We process the rest of the Makefile if this is the final invocation of make
 248ifeq ($(need-sub-make),)
 249
 250# Do not print "Entering directory ...",
 251# but we want to display it when entering to the output directory
 252# so that IDEs/editors are able to understand relative filenames.
 253MAKEFLAGS += --no-print-directory
 254
 255ifeq ($(abs_srctree),$(abs_objtree))
 256        # building in the source tree
 257        srctree := .
 258	building_out_of_srctree :=
 259else
 260        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 261                # building in a subdirectory of the source tree
 262                srctree := ..
 263        else
 264                srctree := $(abs_srctree)
 265        endif
 266	building_out_of_srctree := 1
 267endif
 268
 269ifneq ($(KBUILD_ABS_SRCTREE),)
 270srctree := $(abs_srctree)
 271endif
 272
 273objtree		:= .
 274VPATH		:= $(srctree)
 275
 276export building_out_of_srctree srctree objtree VPATH
 277
 278# To make sure we do not include .config for any of the *config targets
 279# catch them early, and hand them over to scripts/kconfig/Makefile
 280# It is allowed to specify more targets when calling make, including
 281# mixing *config targets and build targets.
 282# For example 'make oldconfig all'.
 283# Detect when mixed targets is specified, and make a second invocation
 284# of make so .config is not included in this case either (for *config).
 285
 286version_h := include/generated/uapi/linux/version.h
 287
 288clean-targets := %clean mrproper cleandocs
 289no-dot-config-targets := $(clean-targets) \
 290			 cscope gtags TAGS tags help% %docs check% coccicheck \
 291			 $(version_h) headers headers_% archheaders archscripts \
 292			 %asm-generic kernelversion %src-pkg dt_binding_check \
 293			 outputmakefile rustavailable rustfmt rustfmtcheck
 294# Installation targets should not require compiler. Unfortunately, vdso_install
 295# is an exception where build artifacts may be updated. This must be fixed.
 296no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
 297			headers_install modules_install kernelrelease image_name
 298no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
 299			  image_name
 300single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
 301
 302config-build	:=
 303mixed-build	:=
 304need-config	:= 1
 305need-compiler	:= 1
 306may-sync-config	:= 1
 307single-build	:=
 308
 309ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 310	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 311		need-config :=
 312	endif
 313endif
 314
 315ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
 316	ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
 317		need-compiler :=
 318	endif
 319endif
 320
 321ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 322	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 323		may-sync-config :=
 324	endif
 325endif
 326
 327ifneq ($(KBUILD_EXTMOD),)
 328	may-sync-config :=
 329endif
 330
 331ifeq ($(KBUILD_EXTMOD),)
 332        ifneq ($(filter %config,$(MAKECMDGOALS)),)
 333		config-build := 1
 334                ifneq ($(words $(MAKECMDGOALS)),1)
 335			mixed-build := 1
 336                endif
 337        endif
 338endif
 339
 340# We cannot build single targets and the others at the same time
 341ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 342	single-build := 1
 343	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 344		mixed-build := 1
 345	endif
 346endif
 347
 348# For "make -j clean all", "make -j mrproper defconfig all", etc.
 349ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 350        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 351		mixed-build := 1
 352        endif
 353endif
 354
 355# install and modules_install need also be processed one by one
 356ifneq ($(filter install,$(MAKECMDGOALS)),)
 357        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 358		mixed-build := 1
 359        endif
 360endif
 361
 362ifdef mixed-build
 363# ===========================================================================
 364# We're called with mixed targets (*config and build targets).
 365# Handle them one by one.
 366
 367PHONY += $(MAKECMDGOALS) __build_one_by_one
 368
 369$(MAKECMDGOALS): __build_one_by_one
 370	@:
 371
 372__build_one_by_one:
 373	$(Q)set -e; \
 374	for i in $(MAKECMDGOALS); do \
 375		$(MAKE) -f $(srctree)/Makefile $$i; \
 376	done
 377
 378else # !mixed-build
 379
 380include $(srctree)/scripts/Kbuild.include
 381
 382# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 383KERNELRELEASE = $(call read-file, include/config/kernel.release)
 384KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 385export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 386
 387include $(srctree)/scripts/subarch.include
 388
 389# Cross compiling and selecting different set of gcc/bin-utils
 390# ---------------------------------------------------------------------------
 391#
 392# When performing cross compilation for other architectures ARCH shall be set
 393# to the target architecture. (See arch/* for the possibilities).
 394# ARCH can be set during invocation of make:
 395# make ARCH=ia64
 396# Another way is to have ARCH set in the environment.
 397# The default ARCH is the host where make is executed.
 398
 399# CROSS_COMPILE specify the prefix used for all executables used
 400# during compilation. Only gcc and related bin-utils executables
 401# are prefixed with $(CROSS_COMPILE).
 402# CROSS_COMPILE can be set on the command line
 403# make CROSS_COMPILE=ia64-linux-
 404# Alternatively CROSS_COMPILE can be set in the environment.
 
 
 405# Default value for CROSS_COMPILE is not to prefix executables
 406# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 
 407ARCH		?= $(SUBARCH)
 
 408
 409# Architecture as present in compile.h
 410UTS_MACHINE 	:= $(ARCH)
 411SRCARCH 	:= $(ARCH)
 412
 413# Additional ARCH settings for x86
 414ifeq ($(ARCH),i386)
 415        SRCARCH := x86
 416endif
 417ifeq ($(ARCH),x86_64)
 418        SRCARCH := x86
 419endif
 420
 421# Additional ARCH settings for sparc
 422ifeq ($(ARCH),sparc32)
 423       SRCARCH := sparc
 424endif
 425ifeq ($(ARCH),sparc64)
 426       SRCARCH := sparc
 427endif
 428
 429# Additional ARCH settings for parisc
 430ifeq ($(ARCH),parisc64)
 431       SRCARCH := parisc
 432endif
 433
 434export cross_compiling :=
 435ifneq ($(SRCARCH),$(SUBARCH))
 436cross_compiling := 1
 
 
 
 
 
 
 
 
 
 
 437endif
 438
 439KCONFIG_CONFIG	?= .config
 440export KCONFIG_CONFIG
 441
 442# SHELL used by kbuild
 443CONFIG_SHELL := sh
 
 
 
 
 
 
 
 444
 445HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 446HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 447HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 
 
 448
 449ifneq ($(LLVM),)
 450ifneq ($(filter %/,$(LLVM)),)
 451LLVM_PREFIX := $(LLVM)
 452else ifneq ($(filter -%,$(LLVM)),)
 453LLVM_SUFFIX := $(LLVM)
 
 
 454endif
 455
 456HOSTCC	= $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 457HOSTCXX	= $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 458else
 459HOSTCC	= gcc
 460HOSTCXX	= g++
 461endif
 462HOSTRUSTC = rustc
 463HOSTPKG_CONFIG	= pkg-config
 464
 465KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 466			 -O2 -fomit-frame-pointer -std=gnu11 \
 467			 -Wdeclaration-after-statement
 468KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
 469KBUILD_USERLDFLAGS := $(USERLDFLAGS)
 470
 471# These flags apply to all Rust code in the tree, including the kernel and
 472# host programs.
 473export rust_common_flags := --edition=2021 \
 474			    -Zbinary_dep_depinfo=y \
 475			    -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
 476			    -Dunreachable_pub -Dnon_ascii_idents \
 477			    -Wmissing_docs \
 478			    -Drustdoc::missing_crate_level_docs \
 479			    -Dclippy::correctness -Dclippy::style \
 480			    -Dclippy::suspicious -Dclippy::complexity \
 481			    -Dclippy::perf \
 482			    -Dclippy::let_unit_value -Dclippy::mut_mut \
 483			    -Dclippy::needless_bitwise_bool \
 484			    -Dclippy::needless_continue \
 485			    -Wclippy::dbg_macro
 486
 487KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
 488KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 489KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
 490			-Zallow-features= $(HOSTRUSTFLAGS)
 491KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 492KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 493
 494# Make variables (CC, etc...)
 
 
 
 
 495CPP		= $(CC) -E
 496ifneq ($(LLVM),)
 497CC		= $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 498LD		= $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
 499AR		= $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
 500NM		= $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
 501OBJCOPY		= $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
 502OBJDUMP		= $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
 503READELF		= $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
 504STRIP		= $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
 505else
 506CC		= $(CROSS_COMPILE)gcc
 507LD		= $(CROSS_COMPILE)ld
 508AR		= $(CROSS_COMPILE)ar
 509NM		= $(CROSS_COMPILE)nm
 
 510OBJCOPY		= $(CROSS_COMPILE)objcopy
 511OBJDUMP		= $(CROSS_COMPILE)objdump
 512READELF		= $(CROSS_COMPILE)readelf
 513STRIP		= $(CROSS_COMPILE)strip
 514endif
 515RUSTC		= rustc
 516RUSTDOC		= rustdoc
 517RUSTFMT		= rustfmt
 518CLIPPY_DRIVER	= clippy-driver
 519BINDGEN		= bindgen
 520CARGO		= cargo
 521PAHOLE		= pahole
 522RESOLVE_BTFIDS	= $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 523LEX		= flex
 524YACC		= bison
 525AWK		= awk
 
 526INSTALLKERNEL  := installkernel
 527DEPMOD		= depmod
 
 528PERL		= perl
 529PYTHON3		= python3
 530CHECK		= sparse
 531BASH		= bash
 532KGZIP		= gzip
 533KBZIP2		= bzip2
 534KLZOP		= lzop
 535LZMA		= lzma
 536LZ4		= lz4c
 537XZ		= xz
 538ZSTD		= zstd
 539
 540PAHOLE_FLAGS	= $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
 541
 542CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 543		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 544NOSTDINC_FLAGS :=
 545CFLAGS_MODULE   =
 546RUSTFLAGS_MODULE =
 547AFLAGS_MODULE   =
 548LDFLAGS_MODULE  =
 549CFLAGS_KERNEL	=
 550RUSTFLAGS_KERNEL =
 551AFLAGS_KERNEL	=
 552LDFLAGS_vmlinux =
 553
 554# Use USERINCLUDE when you must reference the UAPI directories only.
 555USERINCLUDE    := \
 556		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
 557		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 558		-I$(srctree)/include/uapi \
 559		-I$(objtree)/include/generated/uapi \
 560                -include $(srctree)/include/linux/compiler-version.h \
 561                -include $(srctree)/include/linux/kconfig.h
 562
 563# Use LINUXINCLUDE when you must reference the include directory.
 564# Needed to be compatible with the O= option
 565LINUXINCLUDE    := \
 566		-I$(srctree)/arch/$(SRCARCH)/include \
 567		-I$(objtree)/arch/$(SRCARCH)/include/generated \
 568		$(if $(building_out_of_srctree),-I$(srctree)/include) \
 569		-I$(objtree)/include \
 570		$(USERINCLUDE)
 571
 572KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 573KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 574		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 575		   -Werror=implicit-function-declaration -Werror=implicit-int \
 576		   -Werror=return-type -Wno-format-security -funsigned-char \
 577		   -std=gnu11
 578KBUILD_CPPFLAGS := -D__KERNEL__
 579KBUILD_RUSTFLAGS := $(rust_common_flags) \
 580		    --target=$(objtree)/rust/target.json \
 581		    -Cpanic=abort -Cembed-bitcode=n -Clto=n \
 582		    -Cforce-unwind-tables=n -Ccodegen-units=1 \
 583		    -Csymbol-mangling-version=v0 \
 584		    -Crelocation-model=static \
 585		    -Zfunction-sections=n \
 586		    -Dclippy::float_arithmetic
 587
 
 
 
 
 
 588KBUILD_AFLAGS_KERNEL :=
 589KBUILD_CFLAGS_KERNEL :=
 590KBUILD_RUSTFLAGS_KERNEL :=
 591KBUILD_AFLAGS_MODULE  := -DMODULE
 592KBUILD_CFLAGS_MODULE  := -DMODULE
 593KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
 594KBUILD_LDFLAGS_MODULE :=
 595KBUILD_LDFLAGS :=
 596CLANG_FLAGS :=
 597
 598ifeq ($(KBUILD_CLIPPY),1)
 599	RUSTC_OR_CLIPPY_QUIET := CLIPPY
 600	RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
 601else
 602	RUSTC_OR_CLIPPY_QUIET := RUSTC
 603	RUSTC_OR_CLIPPY = $(RUSTC)
 604endif
 605
 606ifdef RUST_LIB_SRC
 607	export RUST_LIB_SRC
 608endif
 609
 610# Allows the usage of unstable features in stable compilers.
 611export RUSTC_BOOTSTRAP := 1
 
 
 
 612
 613export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
 614export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
 615export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
 616export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 617export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 618export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 619export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 620export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
 621
 622export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 623export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 624export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
 625export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 626export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 627export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
 628export PAHOLE_FLAGS
 
 
 
 
 
 629
 630# Files to ignore in find ... statements
 631
 632export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 633			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 634			  -prune -o
 635export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 636			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
 637
 638# ===========================================================================
 639# Rules shared between *config targets and build targets
 640
 641# Basic helpers built in scripts/basic
 642PHONY += scripts_basic
 643scripts_basic:
 644	$(Q)$(MAKE) $(build)=scripts/basic
 
 
 
 
 645
 646PHONY += outputmakefile
 647ifdef building_out_of_srctree
 648# Before starting out-of-tree build, make sure the source tree is clean.
 649# outputmakefile generates a Makefile in the output directory, if using a
 650# separate output directory. This allows convenient use of make in the
 651# output directory.
 652# At the same time when output Makefile generated, generate .gitignore to
 653# ignore whole output directory
 654
 655quiet_cmd_makefile = GEN     Makefile
 656      cmd_makefile = { \
 657	echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
 658	echo "include $(srctree)/Makefile"; \
 659	} > Makefile
 660
 661outputmakefile:
 662	@if [ -f $(srctree)/.config -o \
 663		 -d $(srctree)/include/config -o \
 664		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 665		echo >&2 "***"; \
 666		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 667		echo >&2 "*** in $(abs_srctree)";\
 668		echo >&2 "***"; \
 669		false; \
 670	fi
 671	$(Q)ln -fsn $(srctree) source
 672	$(call cmd,makefile)
 673	$(Q)test -e .gitignore || \
 674	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 675endif
 676
 677# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 678# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 679# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 680# and from include/config/auto.conf.cmd to detect the compiler upgrade.
 681CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
 682
 683ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 684include $(srctree)/scripts/Makefile.clang
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 685endif
 686
 687# Include this also for config targets because some architectures need
 688# cc-cross-prefix to determine CROSS_COMPILE.
 689ifdef need-compiler
 690include $(srctree)/scripts/Makefile.compiler
 
 
 
 691endif
 692
 693ifdef config-build
 
 
 
 
 
 
 
 
 
 694# ===========================================================================
 695# *config targets only - make sure prerequisites are updated, and descend
 696# in scripts/kconfig to make the *config target
 697
 698# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 699# KBUILD_DEFCONFIG may point out an alternative default configuration
 700# used for 'make defconfig'
 701include $(srctree)/arch/$(SRCARCH)/Makefile
 702export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 703
 704config: outputmakefile scripts_basic FORCE
 
 705	$(Q)$(MAKE) $(build)=scripts/kconfig $@
 706
 707%config: outputmakefile scripts_basic FORCE
 
 708	$(Q)$(MAKE) $(build)=scripts/kconfig $@
 709
 710else #!config-build
 711# ===========================================================================
 712# Build targets only - this includes vmlinux, arch specific targets, clean
 713# targets and others. In general all targets except *config targets.
 714
 715# If building an external module we do not care about the all: rule
 716# but instead __all depend on modules
 717PHONY += all
 718ifeq ($(KBUILD_EXTMOD),)
 719__all: all
 720else
 721__all: modules
 722endif
 
 
 723
 724targets :=
 
 
 
 
 
 
 725
 726# Decide whether to build built-in, modular, or both.
 727# Normally, just do built-in.
 
 728
 729KBUILD_MODULES :=
 730KBUILD_BUILTIN := 1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 731
 732# If we have only "make modules", don't compile built-in objects.
 733ifeq ($(MAKECMDGOALS),modules)
 734  KBUILD_BUILTIN :=
 735endif
 
 
 
 
 736
 737# If we have "make <whatever> modules", compile modules
 738# in addition to whatever we do anyway.
 739# Just "make" or "make all" shall build modules as well
 740
 741ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
 742  KBUILD_MODULES := 1
 743endif
 744
 745ifeq ($(MAKECMDGOALS),)
 746  KBUILD_MODULES := 1
 747endif
 748
 749export KBUILD_MODULES KBUILD_BUILTIN
 750
 751ifdef need-config
 752include include/config/auto.conf
 753endif
 754
 755ifeq ($(KBUILD_EXTMOD),)
 756# Objects we will link into vmlinux / subdirs we need to visit
 757core-y		:=
 758drivers-y	:=
 759libs-y		:= lib
 760endif # KBUILD_EXTMOD
 761
 762# The all: target is the default when no target is given on the
 763# command line.
 764# This allow a user to issue only 'make' to build a kernel including modules
 765# Defaults to vmlinux, but the arch makefile usually adds further targets
 766all: vmlinux
 767
 768CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage
 769ifdef CONFIG_CC_IS_GCC
 770CFLAGS_GCOV	+= -fno-tree-loop-im
 771endif
 772export CFLAGS_GCOV
 773
 774# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 775ifdef CONFIG_FUNCTION_TRACER
 776  CC_FLAGS_FTRACE := -pg
 777endif
 778
 779include $(srctree)/arch/$(SRCARCH)/Makefile
 780
 781ifdef need-config
 782ifdef may-sync-config
 783# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 784# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 785# because some architectures define CROSS_COMPILE there.
 786include include/config/auto.conf.cmd
 787
 788$(KCONFIG_CONFIG):
 789	@echo >&2 '***'
 790	@echo >&2 '*** Configuration file "$@" not found!'
 791	@echo >&2 '***'
 792	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 793	@echo >&2 '*** "make menuconfig" or "make xconfig").'
 794	@echo >&2 '***'
 795	@/bin/false
 796
 797# The actual configuration files used during the build are stored in
 798# include/generated/ and include/config/. Update them if .config is newer than
 799# include/config/auto.conf (which mirrors .config).
 800#
 801# This exploits the 'multi-target pattern rule' trick.
 802# The syncconfig should be executed only once to make all the targets.
 803# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 804#
 805# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
 806# so you cannot notice that Kconfig is waiting for the user input.
 807%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
 808	$(Q)$(kecho) "  SYNC    $@"
 809	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 810else # !may-sync-config
 811# External modules and some install targets need include/generated/autoconf.h
 812# and include/config/auto.conf but do not care if they are up-to-date.
 813# Use auto.conf to trigger the test
 814PHONY += include/config/auto.conf
 815
 816include/config/auto.conf:
 817	@test -e include/generated/autoconf.h -a -e $@ || (		\
 818	echo >&2;							\
 819	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
 820	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 821	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
 822	echo >&2 ;							\
 823	/bin/false)
 824
 825endif # may-sync-config
 826endif # need-config
 827
 828KBUILD_CFLAGS	+= -fno-delete-null-pointer-checks
 829KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
 830KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
 831KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
 832KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
 833
 834ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 835KBUILD_CFLAGS += -O2
 836KBUILD_RUSTFLAGS += -Copt-level=2
 837else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 838KBUILD_CFLAGS += -Os
 839KBUILD_RUSTFLAGS += -Copt-level=s
 840endif
 841
 842# Always set `debug-assertions` and `overflow-checks` because their default
 843# depends on `opt-level` and `debug-assertions`, respectively.
 844KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
 845KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
 846
 847# Tell gcc to never replace conditional load with a non-conditional one
 848ifdef CONFIG_CC_IS_GCC
 849# gcc-10 renamed --param=allow-store-data-races=0 to
 850# -fno-allow-store-data-races.
 851KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
 852KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
 853endif
 854
 855ifdef CONFIG_READABLE_ASM
 856# Disable optimizations that make assembler listings hard to read.
 857# reorder blocks reorders the control in the function
 858# ipa clone creates specialized cloned functions
 859# partial inlining inlines only parts of functions
 860KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
 861endif
 862
 863ifneq ($(CONFIG_FRAME_WARN),0)
 864KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 865endif
 866
 867stackp-flags-y                                    := -fno-stack-protector
 868stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 869stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 870
 871KBUILD_CFLAGS += $(stackp-flags-y)
 872
 873KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
 874KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
 875KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
 876
 877KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
 878KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
 879
 880ifdef CONFIG_CC_IS_CLANG
 881KBUILD_CPPFLAGS += -Qunused-arguments
 882# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
 883KBUILD_CFLAGS += -Wno-gnu
 884else
 885
 886# gcc inanely warns about local variables called 'main'
 887KBUILD_CFLAGS += -Wno-main
 888endif
 889
 890# These warnings generated too much noise in a regular build.
 891# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 892KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 893KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 894
 895# These result in bogus false positives
 896KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
 897
 898ifdef CONFIG_FRAME_POINTER
 899KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
 900KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
 901else
 902# Some targets (ARM with Thumb2, for example), can't be built with frame
 903# pointers.  For those, we don't have FUNCTION_TRACER automatically
 904# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 905# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 906# -fomit-frame-pointer with FUNCTION_TRACER.
 907# In the Rust target specification, "frame-pointer" is set explicitly
 908# to "may-omit".
 909ifndef CONFIG_FUNCTION_TRACER
 910KBUILD_CFLAGS	+= -fomit-frame-pointer
 911endif
 912endif
 913
 914# Initialize all stack variables with a 0xAA pattern.
 915ifdef CONFIG_INIT_STACK_ALL_PATTERN
 916KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
 917endif
 918
 919# Initialize all stack variables with a zero value.
 920ifdef CONFIG_INIT_STACK_ALL_ZERO
 921KBUILD_CFLAGS	+= -ftrivial-auto-var-init=zero
 922ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
 923# https://github.com/llvm/llvm-project/issues/44842
 924KBUILD_CFLAGS	+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 925endif
 926endif
 927
 928# While VLAs have been removed, GCC produces unreachable stack probes
 929# for the randomize_kstack_offset feature. Disable it for all compilers.
 930KBUILD_CFLAGS	+= $(call cc-option, -fno-stack-clash-protection)
 931
 932# Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
 933ifdef CONFIG_ZERO_CALL_USED_REGS
 934KBUILD_CFLAGS	+= -fzero-call-used-regs=used-gpr
 935endif
 936
 937ifdef CONFIG_FUNCTION_TRACER
 938ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 939  CC_FLAGS_FTRACE	+= -mrecord-mcount
 940  ifdef CONFIG_HAVE_NOP_MCOUNT
 941    ifeq ($(call cc-option-yn, -mnop-mcount),y)
 942      CC_FLAGS_FTRACE	+= -mnop-mcount
 943      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
 944    endif
 945  endif
 946endif
 947ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 948  ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
 949    CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
 950  endif
 951endif
 952ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 953  ifdef CONFIG_HAVE_C_RECORDMCOUNT
 954    BUILD_C_RECORDMCOUNT := y
 955    export BUILD_C_RECORDMCOUNT
 956  endif
 957endif
 958ifdef CONFIG_HAVE_FENTRY
 959  # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
 960  ifeq ($(call cc-option-yn, -mfentry),y)
 961    CC_FLAGS_FTRACE	+= -mfentry
 962    CC_FLAGS_USING	+= -DCC_USING_FENTRY
 963  endif
 964endif
 965export CC_FLAGS_FTRACE
 966KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 967KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
 968endif
 969
 970# We trigger additional mismatches with less inlining
 971ifdef CONFIG_DEBUG_SECTION_MISMATCH
 972KBUILD_CFLAGS += -fno-inline-functions-called-once
 973endif
 974
 975# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
 976ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 977KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 978KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
 979LDFLAGS_vmlinux += --gc-sections
 980endif
 981
 982ifdef CONFIG_SHADOW_CALL_STACK
 983ifndef CONFIG_DYNAMIC_SCS
 984CC_FLAGS_SCS	:= -fsanitize=shadow-call-stack
 985KBUILD_CFLAGS	+= $(CC_FLAGS_SCS)
 986endif
 987export CC_FLAGS_SCS
 988endif
 989
 990ifdef CONFIG_LTO_CLANG
 991ifdef CONFIG_LTO_CLANG_THIN
 992CC_FLAGS_LTO	:= -flto=thin -fsplit-lto-unit
 993KBUILD_LDFLAGS	+= --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
 994else
 995CC_FLAGS_LTO	:= -flto
 996endif
 997CC_FLAGS_LTO	+= -fvisibility=hidden
 998
 999# Limit inlining across translation units to reduce binary size
1000KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
1001
1002# Check for frame size exceeding threshold during prolog/epilog insertion
1003# when using lld < 13.0.0.
1004ifneq ($(CONFIG_FRAME_WARN),0)
1005ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
1006KBUILD_LDFLAGS	+= -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
1007endif
1008endif
1009endif
1010
1011ifdef CONFIG_LTO
1012KBUILD_CFLAGS	+= -fno-lto $(CC_FLAGS_LTO)
1013KBUILD_AFLAGS	+= -fno-lto
1014export CC_FLAGS_LTO
1015endif
1016
1017ifdef CONFIG_CFI_CLANG
1018CC_FLAGS_CFI	:= -fsanitize=kcfi
1019KBUILD_CFLAGS	+= $(CC_FLAGS_CFI)
1020export CC_FLAGS_CFI
1021endif
1022
1023ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
1024KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
1025endif
1026
1027# arch Makefile may override CC so keep this after arch Makefile is included
1028NOSTDINC_FLAGS += -nostdinc
 
1029
1030# warn about C99 declaration after statement
1031KBUILD_CFLAGS += -Wdeclaration-after-statement
1032
1033# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1034KBUILD_CFLAGS += -Wvla
1035
1036# disable pointer signed / unsigned warnings in gcc 4.0
1037KBUILD_CFLAGS += -Wno-pointer-sign
1038
1039# In order to make sure new function cast mismatches are not introduced
1040# in the kernel (to avoid tripping CFI checking), the kernel should be
1041# globally built with -Wcast-function-type.
1042KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
1043
1044# disable stringop warnings in gcc 8+
1045KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
1046
1047# We'll want to enable this eventually, but it's not going away for 5.7 at least
1048KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1049
1050# Another good warning that we'll want to enable eventually
1051KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1052
1053# Enabled with W=2, disabled by default as noisy
1054ifdef CONFIG_CC_IS_GCC
1055KBUILD_CFLAGS += -Wno-maybe-uninitialized
1056endif
1057
1058# The allocators already balk at large sizes, so silence the compiler
1059# warnings for bounds checks involving those possible values. While
1060# -Wno-alloc-size-larger-than would normally be used here, earlier versions
1061# of gcc (<9.1) weirdly don't handle the option correctly when _other_
1062# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1063# doesn't work (as it is documented to), silently resolving to "0" prior to
1064# version 9.1 (and producing an error more recently). Numeric values larger
1065# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1066# ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1067# choice, we must perform a versioned check to disable this warning.
1068# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1069KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
1070KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
1071
1072# disable invalid "can't wrap" optimizations for signed / pointers
1073KBUILD_CFLAGS	+= -fno-strict-overflow
1074
1075# Make sure -fstack-check isn't enabled (like gentoo apparently did)
1076KBUILD_CFLAGS  += -fno-stack-check
1077
1078# conserve stack if available
1079ifdef CONFIG_CC_IS_GCC
1080KBUILD_CFLAGS   += -fconserve-stack
1081endif
1082
1083# Prohibit date/time macros, which would make the build non-deterministic
1084KBUILD_CFLAGS   += -Werror=date-time
1085
1086# enforce correct pointer usage
1087KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
1088
1089# Require designated initializers for all marked structures
1090KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
1091
1092# change __FILE__ to the relative path from the srctree
1093KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1094
1095# include additional Makefiles when needed
1096include-y			:= scripts/Makefile.extrawarn
1097include-$(CONFIG_DEBUG_INFO)	+= scripts/Makefile.debug
1098include-$(CONFIG_KASAN)		+= scripts/Makefile.kasan
1099include-$(CONFIG_KCSAN)		+= scripts/Makefile.kcsan
1100include-$(CONFIG_KMSAN)		+= scripts/Makefile.kmsan
1101include-$(CONFIG_UBSAN)		+= scripts/Makefile.ubsan
1102include-$(CONFIG_KCOV)		+= scripts/Makefile.kcov
1103include-$(CONFIG_RANDSTRUCT)	+= scripts/Makefile.randstruct
1104include-$(CONFIG_GCC_PLUGINS)	+= scripts/Makefile.gcc-plugins
1105
1106include $(addprefix $(srctree)/, $(include-y))
1107
1108# scripts/Makefile.gcc-plugins is intentionally included last.
1109# Do not add $(call cc-option,...) below this line. When you build the kernel
1110# from the clean source tree, the GCC plugins do not exist at this point.
1111
1112# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1113KBUILD_CPPFLAGS += $(KCPPFLAGS)
1114KBUILD_AFLAGS   += $(KAFLAGS)
1115KBUILD_CFLAGS   += $(KCFLAGS)
1116KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1117
1118KBUILD_LDFLAGS_MODULE += --build-id=sha1
1119LDFLAGS_vmlinux += --build-id=sha1
1120
1121KBUILD_LDFLAGS	+= -z noexecstack
1122ifeq ($(CONFIG_LD_IS_BFD),y)
1123KBUILD_LDFLAGS	+= $(call ld-option,--no-warn-rwx-segments)
1124endif
1125
1126ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1127LDFLAGS_vmlinux	+= -X
 
 
 
 
 
 
1128endif
1129
1130ifeq ($(CONFIG_RELR),y)
1131LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr --use-android-relr-tags
1132endif
1133
1134# We never want expected sections to be placed heuristically by the
1135# linker. All sections should be explicitly named in the linker script.
1136ifdef CONFIG_LD_ORPHAN_WARN
1137LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1138endif
1139
1140# Align the bit size of userspace programs with the kernel
1141KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1142KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
 
 
1143
1144# make the checker run with the right architecture
1145CHECKFLAGS += --arch=$(ARCH)
1146
1147# insure the checker run with the right endianness
1148CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1149
1150# the checker needs the correct machine size
1151CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1152
1153# Default kernel image to build when no specific target is given.
1154# KBUILD_IMAGE may be overruled on the command line or
1155# set in the environment
1156# Also any assignments in arch/$(ARCH)/Makefile take precedence over
1157# this default value
1158export KBUILD_IMAGE ?= vmlinux
1159
1160#
1161# INSTALL_PATH specifies where to place the updated kernel and system map
1162# images. Default is /boot, but you can set it to other values
1163export	INSTALL_PATH ?= /boot
1164
1165#
1166# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1167# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1168# an argument if needed. Otherwise it defaults to the kernel install path
1169#
1170export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1171
1172#
1173# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1174# relocations required by build roots.  This is not defined in the
1175# makefile but the argument can be passed to make if needed.
1176#
1177
1178MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1179export MODLIB
1180
1181PHONY += prepare0
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1182
1183export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1184export MODORDER := $(extmod_prefix)modules.order
1185export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1186
1187ifeq ($(KBUILD_EXTMOD),)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1188
1189build-dir	:= .
1190clean-dirs	:= $(sort . Documentation \
1191		     $(patsubst %/,%,$(filter %/, $(core-) \
1192			$(drivers-) $(libs-))))
1193
1194export ARCH_CORE	:= $(core-y)
1195export ARCH_LIB		:= $(filter %/, $(libs-y))
1196export ARCH_DRIVERS	:= $(drivers-y) $(drivers-m)
1197# Externally visible symbols (used by link-vmlinux.sh)
1198
1199KBUILD_VMLINUX_OBJS := ./built-in.a
1200ifdef CONFIG_MODULES
1201KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1202KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1203else
1204KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1205endif
1206
1207export KBUILD_VMLINUX_LIBS
1208export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1209
1210# Recurse until adjust_autoksyms.sh is satisfied
1211PHONY += autoksyms_recursive
1212ifdef CONFIG_TRIM_UNUSED_KSYMS
1213# For the kernel to actually contain only the needed exported symbols,
1214# we have to build modules as well to determine what those symbols are.
1215# (this can be evaluated only once include/config/auto.conf has been included)
1216KBUILD_MODULES := 1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1217
1218autoksyms_recursive: $(build-dir) modules.order
1219	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1220	  "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1221endif
1222
1223autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1224
1225quiet_cmd_autoksyms_h = GEN     $@
1226      cmd_autoksyms_h = mkdir -p $(dir $@); \
1227			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1228
1229$(autoksyms_h):
1230	$(call cmd,autoksyms_h)
1231
1232# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1233quiet_cmd_ar_vmlinux.a = AR      $@
1234      cmd_ar_vmlinux.a = \
1235	rm -f $@; \
1236	$(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1237	$(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1238
1239targets += vmlinux.a
1240vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE
1241	$(call if_changed,ar_vmlinux.a)
1242
1243PHONY += vmlinux_o
1244vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1245	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1246
1247vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1248	@:
1249
1250PHONY += vmlinux
1251# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1252# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1253# unrelated; the decompressors just happen to have the same base name,
1254# arch/*/boot/compressed/vmlinux.
1255# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1256#
1257# _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1258#   https://savannah.gnu.org/bugs/?61463
1259# For Make > 4.4, the following simple code will work:
1260#  vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1261vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1262vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1263vmlinux: __KEEPMAKEFILEO__C.o $(KBUILD_LDS) modpost
1264	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1265
1266# The actual objects are generated when descending,
1267# make sure no implicit rule kicks in
1268$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1269
1270filechk_kernel.release = \
1271	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 
 
 
1272
1273# Store (new) KERNELRELEASE string in include/config/kernel.release
1274include/config/kernel.release: FORCE
1275	$(call filechk,kernel.release)
 
 
 
 
 
1276
1277# Additional helpers built in scripts
1278# Carefully list dependencies so we do not try to build scripts twice
1279# in parallel
1280PHONY += scripts
1281scripts: scripts_basic scripts_dtc
1282	$(Q)$(MAKE) $(build)=$(@)
1283
1284# Things we need to do before we recursively start building the kernel
1285# or the modules are listed in "prepare".
1286# A multi level approach is used. prepareN is processed before prepareN-1.
1287# archprepare is used in arch Makefiles and when processed asm symlink,
1288# version.h and scripts_basic is processed / created.
1289
1290PHONY += prepare archprepare
 
1291
1292archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1293	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1294	include/generated/compile.h include/generated/autoconf.h remove-stale-files
1295
1296prepare0: archprepare
1297	$(Q)$(MAKE) $(build)=scripts/mod
1298	$(Q)$(MAKE) $(build)=. prepare
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1299
1300# All the preparing..
1301prepare: prepare0
1302ifdef CONFIG_RUST
1303	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v
1304	$(Q)$(MAKE) $(build)=rust
1305endif
1306
1307PHONY += remove-stale-files
1308remove-stale-files:
1309	$(Q)$(srctree)/scripts/remove-stale-files
1310
1311# Support for using generic headers in asm-generic
1312asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1313
1314PHONY += asm-generic uapi-asm-generic
1315asm-generic: uapi-asm-generic
1316	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1317	generic=include/asm-generic
1318uapi-asm-generic:
1319	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1320	generic=include/uapi/asm-generic
1321
1322# Generate some files
1323# ---------------------------------------------------------------------------
1324
1325# KERNELRELEASE can change from a few different places, meaning version.h
1326# needs to be updated, so this check is forced on all builds
1327
1328uts_len := 64
1329define filechk_utsrelease.h
1330	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1331	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1332	  exit 1;                                                         \
1333	fi;                                                               \
1334	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1335endef
1336
1337define filechk_version.h
1338	if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1339		echo \#define LINUX_VERSION_CODE $(shell                 \
1340		expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1341	else                                                             \
1342		echo \#define LINUX_VERSION_CODE $(shell                 \
1343		expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1344	fi;                                                              \
1345	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1346	((c) > 255 ? 255 : (c)))';                                       \
1347	echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1348	echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1349	echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1350endef
1351
1352$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1353$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1354$(version_h): FORCE
1355	$(call filechk,version.h)
1356
1357include/generated/utsrelease.h: include/config/kernel.release FORCE
1358	$(call filechk,utsrelease.h)
1359
1360filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1361	"$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1362
1363include/generated/compile.h: FORCE
1364	$(call filechk,compile.h)
1365
1366PHONY += headerdep
1367headerdep:
1368	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1369	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1370
1371# ---------------------------------------------------------------------------
1372# Kernel headers
1373
1374#Default location for installed headers
1375export INSTALL_HDR_PATH = $(objtree)/usr
1376
1377quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1378      cmd_headers_install = \
1379	mkdir -p $(INSTALL_HDR_PATH); \
1380	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1381	usr/include $(INSTALL_HDR_PATH)
1382
1383PHONY += headers_install
1384headers_install: headers
1385	$(call cmd,headers_install)
1386
1387PHONY += archheaders archscripts
1388
1389hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1390
1391PHONY += headers
1392headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1393	$(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1394	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1395	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1396
1397ifdef CONFIG_HEADERS_INSTALL
1398prepare: headers
1399endif
1400
1401PHONY += scripts_unifdef
1402scripts_unifdef: scripts_basic
1403	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1404
1405# ---------------------------------------------------------------------------
1406# Install
1407
1408# Many distributions have the custom install script, /sbin/installkernel.
1409# If DKMS is installed, 'make install' will eventually recurse back
1410# to this Makefile to build and install external modules.
1411# Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1412
1413quiet_cmd_install = INSTALL $(INSTALL_PATH)
1414      cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1415
1416# ---------------------------------------------------------------------------
1417# Tools
1418
1419ifdef CONFIG_OBJTOOL
1420prepare: tools/objtool
1421endif
1422
1423ifdef CONFIG_BPF
1424ifdef CONFIG_DEBUG_INFO_BTF
1425prepare: tools/bpf/resolve_btfids
1426endif
1427endif
1428
1429PHONY += resolve_btfids_clean
 
1430
1431resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
 
 
 
 
 
 
1432
1433# tools/bpf/resolve_btfids directory might not exist
1434# in output directory, skip its clean in that case
1435resolve_btfids_clean:
1436ifneq ($(wildcard $(resolve_btfids_O)),)
1437	$(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1438endif
1439
1440# Clear a bunch of variables before executing the submake
1441ifeq ($(quiet),silent_)
1442tools_silent=s
1443endif
1444
1445tools/: FORCE
1446	$(Q)mkdir -p $(objtree)/tools
1447	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1448
1449tools/%: FORCE
1450	$(Q)mkdir -p $(objtree)/tools
1451	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1452
1453# ---------------------------------------------------------------------------
1454# Kernel selftest
1455
1456PHONY += kselftest
1457kselftest: headers
1458	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1459
1460kselftest-%: headers FORCE
1461	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1462
1463PHONY += kselftest-merge
1464kselftest-merge:
1465	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1466	$(Q)find $(srctree)/tools/testing/selftests -name config | \
1467		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1468	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1469
1470# ---------------------------------------------------------------------------
1471# Devicetree files
1472
1473ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1474dtstree := arch/$(SRCARCH)/boot/dts
1475endif
1476
1477ifneq ($(dtstree),)
1478
1479%.dtb: dtbs_prepare
1480	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1481
1482%.dtbo: dtbs_prepare
1483	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1484
1485PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1486dtbs: dtbs_prepare
1487	$(Q)$(MAKE) $(build)=$(dtstree)
1488
1489# include/config/kernel.release is actually needed when installing DTBs because
1490# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1491# dtbs_install depend on it as dtbs_install may run as root.
1492dtbs_prepare: include/config/kernel.release scripts_dtc
1493
1494ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1495export CHECK_DTBS=y
1496dtbs: dt_binding_check
1497endif
1498
1499dtbs_check: dtbs
1500
1501dtbs_install:
1502	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1503
1504ifdef CONFIG_OF_EARLY_FLATTREE
1505all: dtbs
1506endif
1507
1508endif
1509
1510PHONY += scripts_dtc
1511scripts_dtc: scripts_basic
1512	$(Q)$(MAKE) $(build)=scripts/dtc
1513
1514ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1515export CHECK_DT_BINDING=y
1516endif
1517
1518PHONY += dt_binding_check
1519dt_binding_check: scripts_dtc
1520	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1521
1522PHONY += dt_compatible_check
1523dt_compatible_check: dt_binding_check
1524	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1525
1526# ---------------------------------------------------------------------------
1527# Modules
1528
1529ifdef CONFIG_MODULES
1530
1531# By default, build modules as well
1532
1533all: modules
1534
1535# When we're building modules with modversions, we need to consider
1536# the built-in objects during the descend as well, in order to
1537# make sure the checksums are up to date before we record them.
1538ifdef CONFIG_MODVERSIONS
1539  KBUILD_BUILTIN := 1
1540endif
 
 
 
 
 
 
1541
1542# Build modules
1543#
1544
1545# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES
1546# is an exception.
1547ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1548KBUILD_BUILTIN := 1
1549modules: vmlinux
1550endif
1551
1552modules: modules_prepare
1553
1554# Target to prepare building external modules
1555modules_prepare: prepare
1556	$(Q)$(MAKE) $(build)=scripts scripts/module.lds
1557
1558export modules_sign_only :=
1559
1560ifeq ($(CONFIG_MODULE_SIG),y)
1561PHONY += modules_sign
1562modules_sign: modules_install
1563	@:
1564
1565# modules_sign is a subset of modules_install.
1566# 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1567ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1568modules_sign_only := y
1569endif
1570endif
1571
1572modinst_pre :=
1573ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1574modinst_pre := __modinst_pre
1575endif
1576
1577modules_install: $(modinst_pre)
1578PHONY += __modinst_pre
1579__modinst_pre:
1580	@rm -rf $(MODLIB)/kernel
1581	@rm -f $(MODLIB)/source
1582	@mkdir -p $(MODLIB)/kernel
1583	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1584	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1585		rm -f $(MODLIB)/build ; \
1586		ln -s $(CURDIR) $(MODLIB)/build ; \
1587	fi
1588	@sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order
1589	@cp -f modules.builtin $(MODLIB)/
1590	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1591
1592endif # CONFIG_MODULES
1593
1594###
1595# Cleaning is done on three levels.
1596# make clean     Delete most generated files
1597#                Leave enough to build external modules
1598# make mrproper  Delete the current configuration, and all generated files
1599# make distclean Remove editor backup files, patch leftover files and the like
1600
1601# Directories & files removed with 'make clean'
1602CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1603	       modules.builtin modules.builtin.modinfo modules.nsdeps \
1604	       compile_commands.json .thinlto-cache rust/test rust/doc \
1605	       .vmlinux.objs .vmlinux.export.c
1606
1607# Directories & files removed with 'make mrproper'
1608MRPROPER_FILES += include/config include/generated          \
1609		  arch/$(SRCARCH)/include/generated .objdiff \
1610		  debian snap tar-install \
1611		  .config .config.old .version \
1612		  Module.symvers \
1613		  certs/signing_key.pem \
1614		  certs/x509.genkey \
1615		  vmlinux-gdb.py \
1616		  *.spec \
1617		  rust/target.json rust/libmacros.so
1618
1619# clean - Delete most, but leave enough to build external modules
1620#
 
1621clean: rm-files := $(CLEAN_FILES)
 
1622
1623PHONY += archclean vmlinuxclean
1624
1625vmlinuxclean:
1626	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1627	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1628
1629clean: archclean vmlinuxclean resolve_btfids_clean
1630
1631# mrproper - Delete all generated files, including .config
1632#
 
1633mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1634mrproper-dirs      := $(addprefix _mrproper_,scripts)
1635
1636PHONY += $(mrproper-dirs) mrproper
1637$(mrproper-dirs):
1638	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1639
1640mrproper: clean $(mrproper-dirs)
 
1641	$(call cmd,rmfiles)
1642	@find . $(RCS_FIND_IGNORE) \
1643		\( -name '*.rmeta' \) \
1644		-type f -print | xargs rm -f
1645
1646# distclean
1647#
1648PHONY += distclean
1649
1650distclean: mrproper
1651	@find . $(RCS_FIND_IGNORE) \
1652		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1653		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1654		-o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1655		-o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1656		-type f -print | xargs rm -f
1657
1658
1659# Packaging of the kernel to various formats
1660# ---------------------------------------------------------------------------
 
 
1661
1662%src-pkg: FORCE
1663	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1664%pkg: include/config/kernel.release FORCE
1665	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
 
 
 
1666
1667# Brief documentation of the typical targets used
1668# ---------------------------------------------------------------------------
1669
1670boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1671boards := $(sort $(notdir $(boards)))
1672board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1673board-dirs := $(sort $(notdir $(board-dirs:/=)))
1674
1675PHONY += help
1676help:
1677	@echo  'Cleaning targets:'
1678	@echo  '  clean		  - Remove most generated files but keep the config and'
1679	@echo  '                    enough build support to build external modules'
1680	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1681	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1682	@echo  ''
1683	@echo  'Configuration targets:'
1684	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1685	@echo  ''
1686	@echo  'Other generic targets:'
1687	@echo  '  all		  - Build all targets marked with [*]'
1688	@echo  '* vmlinux	  - Build the bare kernel'
1689	@echo  '* modules	  - Build all modules'
1690	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
 
 
1691	@echo  '  dir/            - Build all files in dir and below'
1692	@echo  '  dir/file.[ois]  - Build specified target only'
1693	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1694	@echo  '                    (requires compiler support for LLVM assembly generation)'
1695	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1696	@echo  '                    (requires a recent binutils and recent build (System.map))'
1697	@echo  '  dir/file.ko     - Build module including final link'
1698	@echo  '  modules_prepare - Set up for building external modules'
1699	@echo  '  tags/TAGS	  - Generate tags file for editors'
1700	@echo  '  cscope	  - Generate cscope index'
1701	@echo  '  gtags           - Generate GNU GLOBAL index'
1702	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1703	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1704	@echo  '  image_name	  - Output the image name (use with make -s)'
1705	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1706	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1707	 echo  ''
1708	@echo  'Static analysers:'
1709	@echo  '  checkstack      - Generate a list of stack hogs'
 
1710	@echo  '  versioncheck    - Sanity check on version.h usage'
1711	@echo  '  includecheck    - Check for duplicate included header files'
1712	@echo  '  export_report   - List the usages of all exported symbols'
 
1713	@echo  '  headerdep       - Detect inclusion cycles in headers'
1714	@echo  '  coccicheck      - Check with Coccinelle'
1715	@echo  '  clang-analyzer  - Check with clang static analyzer'
1716	@echo  '  clang-tidy      - Check with clang-tidy'
1717	@echo  ''
1718	@echo  'Tools:'
1719	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1720	@echo  ''
1721	@echo  'Kernel selftest:'
1722	@echo  '  kselftest         - Build and run kernel selftest'
1723	@echo  '                      Build, install, and boot kernel before'
1724	@echo  '                      running kselftest on it'
1725	@echo  '                      Run as root for full coverage'
1726	@echo  '  kselftest-all     - Build kernel selftest'
1727	@echo  '  kselftest-install - Build and install kernel selftest'
1728	@echo  '  kselftest-clean   - Remove all generated kselftest files'
1729	@echo  '  kselftest-merge   - Merge all the config dependencies of'
1730	@echo  '		      kselftest to existing .config.'
1731	@echo  ''
1732	@echo  'Rust targets:'
1733	@echo  '  rustavailable   - Checks whether the Rust toolchain is'
1734	@echo  '		    available and, if not, explains why.'
1735	@echo  '  rustfmt	  - Reformat all the Rust code in the kernel'
1736	@echo  '  rustfmtcheck	  - Checks if all the Rust code in the kernel'
1737	@echo  '		    is formatted, printing a diff otherwise.'
1738	@echo  '  rustdoc	  - Generate Rust documentation'
1739	@echo  '		    (requires kernel .config)'
1740	@echo  '  rusttest        - Runs the Rust tests'
1741	@echo  '                    (requires kernel .config; downloads external repos)'
1742	@echo  '  rust-analyzer	  - Generate rust-project.json rust-analyzer support file'
1743	@echo  '		    (requires kernel .config)'
1744	@echo  '  dir/file.[os]   - Build specified target only'
1745	@echo  '  dir/file.rsi    - Build macro expanded source, similar to C preprocessing.'
1746	@echo  '                    Run with RUSTFMT=n to skip reformatting if needed.'
1747	@echo  '                    The output is not intended to be compilable.'
1748	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1749	@echo  ''
1750	@$(if $(dtstree), \
1751		echo 'Devicetree:'; \
1752		echo '* dtbs             - Build device tree blobs for enabled boards'; \
1753		echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1754		echo '  dt_binding_check - Validate device tree binding documents'; \
1755		echo '  dtbs_check       - Validate device tree source files';\
1756		echo '')
1757
1758	@echo 'Userspace tools targets:'
1759	@echo '  use "make tools/help"'
1760	@echo '  or  "cd tools; make help"'
1761	@echo  ''
1762	@echo  'Kernel packaging:'
1763	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
1764	@echo  ''
1765	@echo  'Documentation targets:'
1766	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1767	@echo  ''
1768	@echo  'Architecture specific targets ($(SRCARCH)):'
1769	@$(or $(archhelp),\
1770		echo '  No architecture specific help defined for $(SRCARCH)')
1771	@echo  ''
1772	@$(if $(boards), \
1773		$(foreach b, $(boards), \
1774		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1775		echo '')
1776	@$(if $(board-dirs), \
1777		$(foreach b, $(board-dirs), \
1778		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1779		printf "  %-16s - Show all of the above\\n" help-boards; \
1780		echo '')
1781
1782	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1783	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1784	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1785	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1786	@echo  '                       (sparse by default)'
1787	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1788	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1789	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1790	@echo  '		1: warnings which may be relevant and do not occur too often'
1791	@echo  '		2: warnings which occur quite often but may still be relevant'
1792	@echo  '		3: more obscure warnings, can most likely be ignored'
1793	@echo  '		e: warnings are being treated as errors'
1794	@echo  '		Multiple levels can be combined with W=12 or W=123'
 
1795	@echo  ''
1796	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1797	@echo  'For further info see the ./README file'
1798
1799
1800help-board-dirs := $(addprefix help-,$(board-dirs))
1801
1802help-boards: $(help-board-dirs)
1803
1804boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1805
1806$(help-board-dirs): help-%:
1807	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1808	@$(if $(boards-per-dir), \
1809		$(foreach b, $(boards-per-dir), \
1810		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1811		echo '')
1812
1813
1814# Documentation targets
1815# ---------------------------------------------------------------------------
1816DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1817	       linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1818PHONY += $(DOC_TARGETS)
1819$(DOC_TARGETS):
1820	$(Q)$(MAKE) $(build)=Documentation $@
1821
1822
1823# Rust targets
1824# ---------------------------------------------------------------------------
1825
1826# "Is Rust available?" target
1827PHONY += rustavailable
1828rustavailable:
1829	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!"
1830
1831# Documentation target
1832#
1833# Using the singular to avoid running afoul of `no-dot-config-targets`.
1834PHONY += rustdoc
1835rustdoc: prepare
1836	$(Q)$(MAKE) $(build)=rust $@
1837
1838# Testing target
1839PHONY += rusttest
1840rusttest: prepare
1841	$(Q)$(MAKE) $(build)=rust $@
1842
1843# Formatting targets
1844PHONY += rustfmt rustfmtcheck
1845
1846# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1847#
1848# We match using absolute paths since `find` does not resolve them
1849# when matching, which is a problem when e.g. `srctree` is `..`.
1850# We `grep` afterwards in order to remove the directory entry itself.
1851rustfmt:
1852	$(Q)find $(abs_srctree) -type f -name '*.rs' \
1853		-o -path $(abs_srctree)/rust/alloc -prune \
1854		-o -path $(abs_objtree)/rust/test -prune \
1855		| grep -Fv $(abs_srctree)/rust/alloc \
1856		| grep -Fv $(abs_objtree)/rust/test \
1857		| grep -Fv generated \
1858		| xargs $(RUSTFMT) $(rustfmt_flags)
1859
1860rustfmtcheck: rustfmt_flags = --check
1861rustfmtcheck: rustfmt
1862
1863# IDE support targets
1864PHONY += rust-analyzer
1865rust-analyzer:
1866	$(Q)$(MAKE) $(build)=rust $@
1867
1868# Misc
1869# ---------------------------------------------------------------------------
1870
1871PHONY += scripts_gdb
1872scripts_gdb: prepare0
1873	$(Q)$(MAKE) $(build)=scripts/gdb
1874	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1875
1876ifdef CONFIG_GDB_SCRIPTS
1877all: scripts_gdb
1878endif
1879
1880else # KBUILD_EXTMOD
1881
1882###
1883# External module support.
1884# When building external modules the kernel used as basis is considered
1885# read-only, and no consistency checks are made and the make
1886# system is not used on the basis kernel. If updates are required
1887# in the basis kernel ordinary make commands (without M=...) must be used.
 
 
 
 
 
 
 
 
 
 
1888
1889# We are always building only modules.
1890KBUILD_BUILTIN :=
1891KBUILD_MODULES := 1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1892
1893build-dir := $(KBUILD_EXTMOD)
 
 
1894
1895compile_commands.json: $(extmod_prefix)compile_commands.json
1896PHONY += compile_commands.json
1897
1898clean-dirs := $(KBUILD_EXTMOD)
1899clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1900	$(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1901
1902PHONY += prepare
1903# now expand this into a simple variable to reduce the cost of shell evaluations
1904prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1905prepare:
1906	@if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1907		echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1908		echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1909		echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1910	fi
 
 
 
 
 
1911
1912PHONY += help
1913help:
1914	@echo  '  Building external modules.'
1915	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1916	@echo  ''
1917	@echo  '  modules         - default target, build the module(s)'
1918	@echo  '  modules_install - install the module'
1919	@echo  '  clean           - remove generated files in module directory only'
1920	@echo  ''
1921
 
 
 
 
1922endif # KBUILD_EXTMOD
1923
1924# ---------------------------------------------------------------------------
1925# Modules
1926
1927PHONY += modules modules_install modules_prepare
1928
1929ifdef CONFIG_MODULES
1930
1931$(MODORDER): $(build-dir)
1932	@:
1933
1934# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1935# This is solely useful to speed up test compiles.
1936modules: modpost
1937ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1938	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1939endif
1940
1941PHONY += modules_check
1942modules_check: $(MODORDER)
1943	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1944
1945quiet_cmd_depmod = DEPMOD  $(MODLIB)
1946      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1947                   $(KERNELRELEASE)
1948
1949modules_install:
1950	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1951	$(call cmd,depmod)
1952
1953else # CONFIG_MODULES
1954
1955# Modules not configured
1956# ---------------------------------------------------------------------------
1957
1958modules modules_install:
1959	@echo >&2 '***'
1960	@echo >&2 '*** The present kernel configuration has modules disabled.'
1961	@echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1962	@echo >&2 '*** to enable CONFIG_MODULES.'
1963	@echo >&2 '***'
1964	@exit 1
1965
1966KBUILD_MODULES :=
1967
1968endif # CONFIG_MODULES
1969
1970PHONY += modpost
1971modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1972	 $(if $(KBUILD_MODULES), modules_check)
1973	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1974
1975# Single targets
1976# ---------------------------------------------------------------------------
1977# To build individual files in subdirectories, you can do like this:
1978#
1979#   make foo/bar/baz.s
1980#
1981# The supported suffixes for single-target are listed in 'single-targets'
1982#
1983# To build only under specific subdirectories, you can do like this:
1984#
1985#   make foo/bar/baz/
1986
1987ifdef single-build
1988
1989# .ko is special because modpost is needed
1990single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1991single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1992		$(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1993
1994$(single-ko): single_modules
1995	@:
1996$(single-no-ko): $(build-dir)
1997	@:
1998
1999# Remove MODORDER when done because it is not the real one.
2000PHONY += single_modules
2001single_modules: $(single-no-ko) modules_prepare
2002	$(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
2003	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
2004ifneq ($(KBUILD_MODPOST_NOFINAL),1)
2005	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
2006endif
2007	$(Q)rm -f $(MODORDER)
2008
2009single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
2010
2011KBUILD_MODULES := 1
2012
2013endif
2014
2015# Preset locale variables to speed up the build process. Limit locale
2016# tweaks to this spot to avoid wrong language settings when running
2017# make menuconfig etc.
2018# Error messages still appears in the original language
2019PHONY += $(build-dir)
2020$(build-dir): prepare
2021	$(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
2022
2023clean-dirs := $(addprefix _clean_, $(clean-dirs))
2024PHONY += $(clean-dirs) clean
2025$(clean-dirs):
2026	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
2027
2028clean: $(clean-dirs)
 
2029	$(call cmd,rmfiles)
2030	@find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
2031		\( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2032		-o -name '*.ko.*' \
2033		-o -name '*.dtb' -o -name '*.dtbo' \
2034		-o -name '*.dtb.S' -o -name '*.dtbo.S' \
2035		-o -name '*.dt.yaml' \
2036		-o -name '*.dwo' -o -name '*.lst' \
2037		-o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \
2038		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2039		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
2040		-o -name '*.asn1.[ch]' \
2041		-o -name '*.symtypes' -o -name 'modules.order' \
2042		-o -name '.tmp_*' \
2043		-o -name '*.c.[012]*.*' \
2044		-o -name '*.ll' \
2045		-o -name '*.gcno' \
2046		-o -name '*.*.symversions' \) -type f -print | xargs rm -f
2047
2048# Generate tags for editors
2049# ---------------------------------------------------------------------------
2050quiet_cmd_tags = GEN     $@
2051      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
2052
2053tags TAGS cscope gtags: FORCE
2054	$(call cmd,tags)
2055
2056# Script to generate missing namespace dependencies
2057# ---------------------------------------------------------------------------
2058
2059PHONY += nsdeps
2060nsdeps: export KBUILD_NSDEPS=1
2061nsdeps: modules
2062	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2063
2064# Clang Tooling
2065# ---------------------------------------------------------------------------
2066
2067quiet_cmd_gen_compile_commands = GEN     $@
2068      cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2069
2070$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
2071	$(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2072	$(if $(CONFIG_MODULES), $(MODORDER)) FORCE
2073	$(call if_changed,gen_compile_commands)
2074
2075targets += $(extmod_prefix)compile_commands.json
2076
2077PHONY += clang-tidy clang-analyzer
2078
2079ifdef CONFIG_CC_IS_CLANG
2080quiet_cmd_clang_tools = CHECK   $<
2081      cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2082
2083clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
2084	$(call cmd,clang_tools)
2085else
2086clang-tidy clang-analyzer:
2087	@echo "$@ requires CC=clang" >&2
2088	@false
2089endif
2090
2091# Scripts to check various things for consistency
2092# ---------------------------------------------------------------------------
2093
2094PHONY += includecheck versioncheck coccicheck export_report
2095
2096includecheck:
2097	find $(srctree)/* $(RCS_FIND_IGNORE) \
2098		-name '*.[hcS]' -type f -print | sort \
2099		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2100
2101versioncheck:
2102	find $(srctree)/* $(RCS_FIND_IGNORE) \
2103		-name '*.[hcS]' -type f -print | sort \
2104		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2105
2106coccicheck:
2107	$(Q)$(BASH) $(srctree)/scripts/$@
 
 
 
2108
2109export_report:
2110	$(PERL) $(srctree)/scripts/export_report.pl
2111
2112PHONY += checkstack kernelrelease kernelversion image_name
 
 
 
2113
2114# UML needs a little special treatment here.  It wants to use the host
2115# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
2116# else wants $(ARCH), including people doing cross-builds, which means
2117# that $(SUBARCH) doesn't work here.
2118ifeq ($(ARCH), um)
2119CHECKSTACK_ARCH := $(SUBARCH)
2120else
2121CHECKSTACK_ARCH := $(ARCH)
2122endif
2123checkstack:
2124	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2125	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2126
2127kernelrelease:
2128	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
2129
2130kernelversion:
2131	@echo $(KERNELVERSION)
2132
2133image_name:
2134	@echo $(KBUILD_IMAGE)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2135
2136quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
2137      cmd_rmfiles = rm -rf $(rm-files)
2138
2139# read saved command lines for existing targets
2140existing-targets := $(wildcard $(sort $(targets)))
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2141
2142-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
 
 
 
2143
2144endif # config-build
2145endif # mixed-build
2146endif # need-sub-make
2147
2148PHONY += FORCE
2149FORCE:
2150
2151# Declare the contents of the PHONY variable as phony.  We keep that
2152# information in a variable so we can use it in if_changed and friends.
2153.PHONY: $(PHONY)