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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)
v5.4
   1# SPDX-License-Identifier: GPL-2.0
   2VERSION = 5
   3PATCHLEVEL = 4
   4SUBLEVEL = 0
   5EXTRAVERSION =
   6NAME = Kleptomaniac Octopus
   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
  14# That's our default target when none is given on the command line
  15PHONY := _all
  16_all:
 
 
 
 
 
 
 
 
  17
  18# We are using a recursive build, so we need to do a little thinking
  19# to get the ordering right.
  20#
  21# Most importantly: sub-Makefiles should only ever modify files in
  22# their own directory. If in some directory we have a dependency on
  23# a file in another dir (which doesn't happen often, but it's often
  24# unavoidable when linking the built-in.a targets which finally
  25# turn into vmlinux), we will call a sub make in that other dir, and
  26# after that we are sure that everything which is in that other dir
  27# is now up to date.
  28#
  29# The only cases where we need to modify files which have global
  30# effects are thus separated out and done before the recursive
  31# descending is started. They are now explicitly listed as the
  32# prepare rule.
  33
  34ifneq ($(sub_make_done),1)
  35
  36# Do not use make's built-in rules and variables
  37# (this increases performance and avoids hard-to-debug behaviour)
  38MAKEFLAGS += -rR
  39
  40# Avoid funny character set dependencies
  41unexport LC_ALL
  42LC_COLLATE=C
  43LC_NUMERIC=C
  44export LC_COLLATE LC_NUMERIC
  45
  46# Avoid interference with shell env settings
  47unexport GREP_OPTIONS
  48
  49# Beautify output
  50# ---------------------------------------------------------------------------
  51#
  52# Normally, we echo the whole command before executing it. By making
  53# that echo $($(quiet)$(cmd)), we now have the possibility to set
  54# $(quiet) to choose other forms of output instead, e.g.
  55#
  56#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  57#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  58#
  59# If $(quiet) is empty, the whole command will be printed.
  60# If it is set to "quiet_", only the short version will be printed.
  61# If it is set to "silent_", nothing will be printed at all, since
  62# the variable $(silent_cmd_cc_o_c) doesn't exist.
  63#
  64# A simple variant is to prefix commands with $(Q) - that's useful
  65# for commands that shall be hidden in non-verbose mode.
  66#
  67#	$(Q)ln $@ :<
  68#
  69# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70# If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71#
  72# To put more focus on warnings, be less verbose as default
  73# Use 'make V=1' to see the full commands
  74
  75ifeq ("$(origin V)", "command line")
  76  KBUILD_VERBOSE = $(V)
  77endif
  78ifndef KBUILD_VERBOSE
  79  KBUILD_VERBOSE = 0
  80endif
  81
  82ifeq ($(KBUILD_VERBOSE),1)
  83  quiet =
  84  Q =
  85else
  86  quiet=quiet_
  87  Q = @
  88endif
  89
  90# If the user is running make -s (silent mode), suppress echoing of
  91# commands
  92
  93ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  94  quiet=silent_
  95endif
  96
  97export quiet Q KBUILD_VERBOSE
  98
  99# Kbuild will save output files in the current working directory.
 100# This does not need to match to the root of the kernel source tree.
 101#
 102# For example, you can do this:
 103#
 104#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 105#
 106# If you want to save output files in a different location, there are
 107# two syntaxes to specify it.
 108#
 109# 1) O=
 110# Use "make O=dir/to/store/output/files/"
 111#
 112# 2) Set KBUILD_OUTPUT
 113# Set the environment variable KBUILD_OUTPUT to point to the output directory.
 114# export KBUILD_OUTPUT=dir/to/store/output/files/; make
 115#
 116# The O= assignment takes precedence over the KBUILD_OUTPUT environment
 117# variable.
 118
 119# Do we want to change the working directory?
 120ifeq ("$(origin O)", "command line")
 121  KBUILD_OUTPUT := $(O)
 122endif
 123
 124ifneq ($(KBUILD_OUTPUT),)
 125# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 126# expand a shell special character '~'. We use a somewhat tedious way here.
 127abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 128$(if $(abs_objtree),, \
 129     $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 130
 131# $(realpath ...) resolves symlinks
 132abs_objtree := $(realpath $(abs_objtree))
 133else
 134abs_objtree := $(CURDIR)
 135endif # ifneq ($(KBUILD_OUTPUT),)
 136
 137ifeq ($(abs_objtree),$(CURDIR))
 138# Suppress "Entering directory ..." unless we are changing the work directory.
 139MAKEFLAGS += --no-print-directory
 140else
 141need-sub-make := 1
 142endif
 143
 144abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 145
 146ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 147$(error source directory cannot contain spaces or colons)
 148endif
 149
 150ifneq ($(abs_srctree),$(abs_objtree))
 151# Look for make include files relative to root of kernel src
 152#
 153# This does not become effective immediately because MAKEFLAGS is re-parsed
 154# once after the Makefile is read. We need to invoke sub-make.
 155MAKEFLAGS += --include-dir=$(abs_srctree)
 156need-sub-make := 1
 157endif
 158
 159ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 160# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 161# We need to invoke sub-make to avoid implicit rules in the top Makefile.
 162need-sub-make := 1
 163# Cancel implicit rules for this Makefile.
 164$(lastword $(MAKEFILE_LIST)): ;
 165endif
 166
 167export abs_srctree abs_objtree
 168export sub_make_done := 1
 169
 170ifeq ($(need-sub-make),1)
 171
 172PHONY += $(MAKECMDGOALS) sub-make
 173
 174$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 175	@:
 176
 177# Invoke a second make in the output directory, passing relevant variables
 178sub-make:
 179	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 180
 181endif # need-sub-make
 182endif # sub_make_done
 183
 184# We process the rest of the Makefile if this is the final invocation of make
 185ifeq ($(need-sub-make),)
 186
 187# Do not print "Entering directory ...",
 188# but we want to display it when entering to the output directory
 189# so that IDEs/editors are able to understand relative filenames.
 190MAKEFLAGS += --no-print-directory
 191
 192# Call a source code checker (by default, "sparse") as part of the
 193# C compilation.
 194#
 195# Use 'make C=1' to enable checking of only re-compiled files.
 196# Use 'make C=2' to enable checking of *all* source files, regardless
 197# of whether they are re-compiled or not.
 198#
 199# See the file "Documentation/dev-tools/sparse.rst" for more details,
 200# including where to get the "sparse" utility.
 201
 202ifeq ("$(origin C)", "command line")
 203  KBUILD_CHECKSRC = $(C)
 204endif
 205ifndef KBUILD_CHECKSRC
 206  KBUILD_CHECKSRC = 0
 207endif
 208
 209# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 210# directory of external module to build. Setting M= takes precedence.
 
 
 
 
 
 211ifeq ("$(origin M)", "command line")
 212  KBUILD_EXTMOD := $(M)
 213endif
 214
 215export KBUILD_CHECKSRC KBUILD_EXTMOD
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 216
 217extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
 
 
 218
 219ifeq ($(abs_srctree),$(abs_objtree))
 220        # building in the source tree
 221        srctree := .
 222	building_out_of_srctree :=
 223else
 224        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 225                # building in a subdirectory of the source tree
 226                srctree := ..
 227        else
 228                srctree := $(abs_srctree)
 229        endif
 230	building_out_of_srctree := 1
 231endif
 232
 233ifneq ($(KBUILD_ABS_SRCTREE),)
 234srctree := $(abs_srctree)
 235endif
 236
 237objtree		:= .
 238VPATH		:= $(srctree)
 
 239
 240export building_out_of_srctree srctree objtree VPATH
 
 241
 242# To make sure we do not include .config for any of the *config targets
 243# catch them early, and hand them over to scripts/kconfig/Makefile
 244# It is allowed to specify more targets when calling make, including
 245# mixing *config targets and build targets.
 246# For example 'make oldconfig all'.
 247# Detect when mixed targets is specified, and make a second invocation
 248# of make so .config is not included in this case either (for *config).
 249
 250version_h := include/generated/uapi/linux/version.h
 251old_version_h := include/linux/version.h
 252
 253clean-targets := %clean mrproper cleandocs
 254no-dot-config-targets := $(clean-targets) \
 255			 cscope gtags TAGS tags help% %docs check% coccicheck \
 256			 $(version_h) headers headers_% archheaders archscripts \
 257			 %asm-generic kernelversion %src-pkg
 258no-sync-config-targets := $(no-dot-config-targets) install %install \
 259			   kernelrelease
 260single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 261
 262config-build	:=
 263mixed-build	:=
 264need-config	:= 1
 265may-sync-config	:= 1
 266single-build	:=
 267
 268ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 269	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 270		need-config :=
 271	endif
 272endif
 273
 274ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 275	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 276		may-sync-config :=
 277	endif
 278endif
 279
 280ifneq ($(KBUILD_EXTMOD),)
 281	may-sync-config :=
 282endif
 283
 
 
 
 284ifeq ($(KBUILD_EXTMOD),)
 285        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 286		config-build := 1
 287                ifneq ($(words $(MAKECMDGOALS)),1)
 288			mixed-build := 1
 289                endif
 290        endif
 291endif
 292
 293# We cannot build single targets and the others at the same time
 294ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 295	single-build := 1
 296	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 297		mixed-build := 1
 298	endif
 299endif
 300
 301# For "make -j clean all", "make -j mrproper defconfig all", etc.
 302ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 303        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 304		mixed-build := 1
 305        endif
 306endif
 307
 308# install and modules_install need also be processed one by one
 309ifneq ($(filter install,$(MAKECMDGOALS)),)
 310        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 311		mixed-build := 1
 312        endif
 313endif
 314
 315ifdef mixed-build
 316# ===========================================================================
 317# We're called with mixed targets (*config and build targets).
 318# Handle them one by one.
 319
 320PHONY += $(MAKECMDGOALS) __build_one_by_one
 321
 322$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 323	@:
 324
 325__build_one_by_one:
 326	$(Q)set -e; \
 327	for i in $(MAKECMDGOALS); do \
 328		$(MAKE) -f $(srctree)/Makefile $$i; \
 329	done
 330
 331else # !mixed-build
 332
 333include scripts/Kbuild.include
 334
 335# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 336KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 337KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 338export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 339
 340include scripts/subarch.include
 341
 342# Cross compiling and selecting different set of gcc/bin-utils
 343# ---------------------------------------------------------------------------
 344#
 345# When performing cross compilation for other architectures ARCH shall be set
 346# to the target architecture. (See arch/* for the possibilities).
 347# ARCH can be set during invocation of make:
 348# make ARCH=ia64
 349# Another way is to have ARCH set in the environment.
 350# The default ARCH is the host where make is executed.
 351
 352# CROSS_COMPILE specify the prefix used for all executables used
 353# during compilation. Only gcc and related bin-utils executables
 354# are prefixed with $(CROSS_COMPILE).
 355# CROSS_COMPILE can be set on the command line
 356# make CROSS_COMPILE=ia64-linux-
 357# Alternatively CROSS_COMPILE can be set in the environment.
 
 
 358# Default value for CROSS_COMPILE is not to prefix executables
 359# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 
 360ARCH		?= $(SUBARCH)
 
 361
 362# Architecture as present in compile.h
 363UTS_MACHINE 	:= $(ARCH)
 364SRCARCH 	:= $(ARCH)
 365
 366# Additional ARCH settings for x86
 367ifeq ($(ARCH),i386)
 368        SRCARCH := x86
 369endif
 370ifeq ($(ARCH),x86_64)
 371        SRCARCH := x86
 372endif
 373
 374# Additional ARCH settings for sparc
 375ifeq ($(ARCH),sparc32)
 376       SRCARCH := sparc
 377endif
 378ifeq ($(ARCH),sparc64)
 379       SRCARCH := sparc
 380endif
 381
 382# Additional ARCH settings for sh
 383ifeq ($(ARCH),sh64)
 384       SRCARCH := sh
 385endif
 386
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 387KCONFIG_CONFIG	?= .config
 388export KCONFIG_CONFIG
 389
 390# SHELL used by kbuild
 391CONFIG_SHELL := sh
 392
 393HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 394HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 395HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 396
 397HOSTCC       = gcc
 398HOSTCXX      = g++
 399KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 400		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 401		$(HOSTCFLAGS)
 402KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 403KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 404KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 405
 406# Make variables (CC, etc...)
 
 407AS		= $(CROSS_COMPILE)as
 408LD		= $(CROSS_COMPILE)ld
 409CC		= $(CROSS_COMPILE)gcc
 410CPP		= $(CC) -E
 411AR		= $(CROSS_COMPILE)ar
 412NM		= $(CROSS_COMPILE)nm
 413STRIP		= $(CROSS_COMPILE)strip
 414OBJCOPY		= $(CROSS_COMPILE)objcopy
 415OBJDUMP		= $(CROSS_COMPILE)objdump
 416OBJSIZE		= $(CROSS_COMPILE)size
 417PAHOLE		= pahole
 418LEX		= flex
 419YACC		= bison
 420AWK		= awk
 
 421INSTALLKERNEL  := installkernel
 422DEPMOD		= /sbin/depmod
 
 423PERL		= perl
 424PYTHON		= python
 425PYTHON2		= python2
 426PYTHON3		= python3
 427CHECK		= sparse
 428BASH		= bash
 429
 430CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 431		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 432NOSTDINC_FLAGS :=
 433CFLAGS_MODULE   =
 434AFLAGS_MODULE   =
 435LDFLAGS_MODULE  =
 436CFLAGS_KERNEL	=
 437AFLAGS_KERNEL	=
 438LDFLAGS_vmlinux =
 439
 440# Use USERINCLUDE when you must reference the UAPI directories only.
 441USERINCLUDE    := \
 442		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
 443		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 444		-I$(srctree)/include/uapi \
 445		-I$(objtree)/include/generated/uapi \
 446                -include $(srctree)/include/linux/kconfig.h
 447
 448# Use LINUXINCLUDE when you must reference the include directory.
 449# Needed to be compatible with the O= option
 450LINUXINCLUDE    := \
 451		-I$(srctree)/arch/$(SRCARCH)/include \
 452		-I$(objtree)/arch/$(SRCARCH)/include/generated \
 453		$(if $(building_out_of_srctree),-I$(srctree)/include) \
 454		-I$(objtree)/include \
 455		$(USERINCLUDE)
 456
 457KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 458KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 459		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 460		   -Werror=implicit-function-declaration -Werror=implicit-int \
 461		   -Wno-format-security \
 462		   -std=gnu89
 463KBUILD_CPPFLAGS := -D__KERNEL__
 464KBUILD_AFLAGS_KERNEL :=
 465KBUILD_CFLAGS_KERNEL :=
 
 466KBUILD_AFLAGS_MODULE  := -DMODULE
 467KBUILD_CFLAGS_MODULE  := -DMODULE
 468KBUILD_LDFLAGS_MODULE :=
 469export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 470KBUILD_LDFLAGS :=
 471GCC_PLUGINS_CFLAGS :=
 472CLANG_FLAGS :=
 473
 474export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 475export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
 476export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 477export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 478
 479export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 480export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 481export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 482export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 483export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 484export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 
 
 
 
 
 
 485
 486# Files to ignore in find ... statements
 487
 488export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 489			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 490			  -prune -o
 491export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 492			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
 493
 494# ===========================================================================
 495# Rules shared between *config targets and build targets
 496
 497# Basic helpers built in scripts/basic
 498PHONY += scripts_basic
 499scripts_basic:
 500	$(Q)$(MAKE) $(build)=scripts/basic
 501	$(Q)rm -f .tmp_quiet_recordmcount
 502
 
 
 
 503PHONY += outputmakefile
 504# Before starting out-of-tree build, make sure the source tree is clean.
 505# outputmakefile generates a Makefile in the output directory, if using a
 506# separate output directory. This allows convenient use of make in the
 507# output directory.
 508# At the same time when output Makefile generated, generate .gitignore to
 509# ignore whole output directory
 510outputmakefile:
 511ifdef building_out_of_srctree
 512	$(Q)if [ -f $(srctree)/.config -o \
 513		 -d $(srctree)/include/config -o \
 514		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 515		echo >&2 "***"; \
 516		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 517		echo >&2 "*** in $(abs_srctree)";\
 518		echo >&2 "***"; \
 519		false; \
 520	fi
 521	$(Q)ln -fsn $(srctree) source
 522	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 523	$(Q)test -e .gitignore || \
 524	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 525endif
 526
 527ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 528ifneq ($(CROSS_COMPILE),)
 529CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
 530GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 531CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
 532GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 533endif
 534ifneq ($(GCC_TOOLCHAIN),)
 535CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
 536endif
 537ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
 538CLANG_FLAGS	+= -no-integrated-as
 539endif
 540CLANG_FLAGS	+= -Werror=unknown-warning-option
 541KBUILD_CFLAGS	+= $(CLANG_FLAGS)
 542KBUILD_AFLAGS	+= $(CLANG_FLAGS)
 543export CLANG_FLAGS
 544endif
 545
 546# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 547# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 548# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 549# and from include/config/auto.conf.cmd to detect the compiler upgrade.
 550CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 
 
 551
 552ifdef config-build
 
 553# ===========================================================================
 554# *config targets only - make sure prerequisites are updated, and descend
 555# in scripts/kconfig to make the *config target
 556
 557# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 558# KBUILD_DEFCONFIG may point out an alternative default configuration
 559# used for 'make defconfig'
 560include arch/$(SRCARCH)/Makefile
 561export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 562
 563config: outputmakefile scripts_basic FORCE
 
 564	$(Q)$(MAKE) $(build)=scripts/kconfig $@
 565
 566%config: outputmakefile scripts_basic FORCE
 
 567	$(Q)$(MAKE) $(build)=scripts/kconfig $@
 568
 569else #!config-build
 570# ===========================================================================
 571# Build targets only - this includes vmlinux, arch specific targets, clean
 572# targets and others. In general all targets except *config targets.
 573
 574# If building an external module we do not care about the all: rule
 575# but instead _all depend on modules
 576PHONY += all
 577ifeq ($(KBUILD_EXTMOD),)
 578_all: all
 579else
 580_all: modules
 581endif
 
 
 582
 583# Decide whether to build built-in, modular, or both.
 584# Normally, just do built-in.
 585
 586KBUILD_MODULES :=
 587KBUILD_BUILTIN := 1
 588
 589# If we have only "make modules", don't compile built-in objects.
 590# When we're building modules with modversions, we need to consider
 591# the built-in objects during the descend as well, in order to
 592# make sure the checksums are up to date before we record them.
 593
 594ifeq ($(MAKECMDGOALS),modules)
 595  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 596endif
 597
 598# If we have "make <whatever> modules", compile modules
 599# in addition to whatever we do anyway.
 600# Just "make" or "make all" shall build modules as well
 601
 602ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
 603  KBUILD_MODULES := 1
 604endif
 605
 606ifeq ($(MAKECMDGOALS),)
 607  KBUILD_MODULES := 1
 608endif
 609
 610export KBUILD_MODULES KBUILD_BUILTIN
 611
 612ifdef need-config
 613include include/config/auto.conf
 614endif
 615
 616ifeq ($(KBUILD_EXTMOD),)
 617# Objects we will link into vmlinux / subdirs we need to visit
 618init-y		:= init
 619drivers-y	:= drivers sound
 620drivers-$(CONFIG_SAMPLES) += samples
 621drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
 622net-y		:= net
 623libs-y		:= lib
 624core-y		:= usr
 625virt-y		:= virt
 626endif # KBUILD_EXTMOD
 627
 628# The all: target is the default when no target is given on the
 629# command line.
 630# This allow a user to issue only 'make' to build a kernel including modules
 631# Defaults to vmlinux, but the arch makefile usually adds further targets
 632all: vmlinux
 633
 634CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
 635	$(call cc-option,-fno-tree-loop-im) \
 636	$(call cc-disable-warning,maybe-uninitialized,)
 637export CFLAGS_GCOV
 638
 639# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 640ifdef CONFIG_FUNCTION_TRACER
 641  CC_FLAGS_FTRACE := -pg
 642endif
 643
 644RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 645RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 646RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 647RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 648RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 649RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 650export RETPOLINE_CFLAGS
 651export RETPOLINE_VDSO_CFLAGS
 652
 653include arch/$(SRCARCH)/Makefile
 654
 655ifdef need-config
 656ifdef may-sync-config
 657# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 658# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 659# because some architectures define CROSS_COMPILE there.
 660include include/config/auto.conf.cmd
 661
 662$(KCONFIG_CONFIG):
 663	@echo >&2 '***'
 664	@echo >&2 '*** Configuration file "$@" not found!'
 665	@echo >&2 '***'
 666	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 667	@echo >&2 '*** "make menuconfig" or "make xconfig").'
 668	@echo >&2 '***'
 669	@/bin/false
 670
 671# The actual configuration files used during the build are stored in
 672# include/generated/ and include/config/. Update them if .config is newer than
 673# include/config/auto.conf (which mirrors .config).
 674#
 675# This exploits the 'multi-target pattern rule' trick.
 676# The syncconfig should be executed only once to make all the targets.
 677%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 678	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 679else # !may-sync-config
 680# External modules and some install targets need include/generated/autoconf.h
 681# and include/config/auto.conf but do not care if they are up-to-date.
 682# Use auto.conf to trigger the test
 683PHONY += include/config/auto.conf
 684
 685include/config/auto.conf:
 686	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
 687	echo >&2;							\
 688	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
 689	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 690	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
 691	echo >&2 ;							\
 692	/bin/false)
 693
 694endif # may-sync-config
 695endif # need-config
 
 
 
 
 696
 697KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
 698KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
 699KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
 700KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
 701KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
 702
 703ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 704KBUILD_CFLAGS += -O2
 705else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
 706KBUILD_CFLAGS += -O3
 707else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 708KBUILD_CFLAGS += -Os
 709endif
 710
 711ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 712KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 713endif
 714
 715# Tell gcc to never replace conditional load with a non-conditional one
 716KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
 717
 718include scripts/Makefile.kcov
 719include scripts/Makefile.gcc-plugins
 720
 721ifdef CONFIG_READABLE_ASM
 722# Disable optimizations that make assembler listings hard to read.
 723# reorder blocks reorders the control in the function
 724# ipa clone creates specialized cloned functions
 725# partial inlining inlines only parts of functions
 726KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 727                 $(call cc-option,-fno-ipa-cp-clone,) \
 728                 $(call cc-option,-fno-partial-inlining)
 729endif
 730
 
 
 731ifneq ($(CONFIG_FRAME_WARN),0)
 732KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 733endif
 734
 735stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 736stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 737stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 738
 739KBUILD_CFLAGS += $(stackp-flags-y)
 740
 741ifdef CONFIG_CC_IS_CLANG
 742KBUILD_CPPFLAGS += -Qunused-arguments
 743KBUILD_CFLAGS += -Wno-format-invalid-specifier
 744KBUILD_CFLAGS += -Wno-gnu
 745# Quiet clang warning: comparison of unsigned expression < 0 is always false
 746KBUILD_CFLAGS += -Wno-tautological-compare
 747# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 748# source of a reference will be _MergedGlobals and not on of the whitelisted names.
 749# See modpost pattern 2
 750KBUILD_CFLAGS += -mno-global-merge
 751else
 752
 753# These warnings generated too much noise in a regular build.
 754# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 755KBUILD_CFLAGS += -Wno-unused-but-set-variable
 756
 757# Warn about unmarked fall-throughs in switch statement.
 758# Disabled for clang while comment to attribute conversion happens and
 759# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 760KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 761endif
 762
 763KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 764ifdef CONFIG_FRAME_POINTER
 765KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
 766else
 767# Some targets (ARM with Thumb2, for example), can't be built with frame
 768# pointers.  For those, we don't have FUNCTION_TRACER automatically
 769# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 770# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 771# -fomit-frame-pointer with FUNCTION_TRACER.
 772ifndef CONFIG_FUNCTION_TRACER
 773KBUILD_CFLAGS	+= -fomit-frame-pointer
 774endif
 775endif
 776
 777# Initialize all stack variables with a pattern, if desired.
 778ifdef CONFIG_INIT_STACK_ALL
 779KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
 780endif
 781
 782DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
 783
 784ifdef CONFIG_DEBUG_INFO
 785ifdef CONFIG_DEBUG_INFO_SPLIT
 786DEBUG_CFLAGS	+= -gsplit-dwarf
 787else
 788DEBUG_CFLAGS	+= -g
 789endif
 790KBUILD_AFLAGS	+= -Wa,-gdwarf-2
 791endif
 792ifdef CONFIG_DEBUG_INFO_DWARF4
 793DEBUG_CFLAGS	+= -gdwarf-4
 794endif
 795
 796ifdef CONFIG_DEBUG_INFO_REDUCED
 797DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
 798		   $(call cc-option,-fno-var-tracking)
 799endif
 800
 801KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 802export DEBUG_CFLAGS
 803
 804ifdef CONFIG_FUNCTION_TRACER
 805ifdef CONFIG_FTRACE_MCOUNT_RECORD
 806  # gcc 5 supports generating the mcount tables directly
 807  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 808    CC_FLAGS_FTRACE	+= -mrecord-mcount
 809    export CC_USING_RECORD_MCOUNT := 1
 810  endif
 811  ifdef CONFIG_HAVE_NOP_MCOUNT
 812    ifeq ($(call cc-option-yn, -mnop-mcount),y)
 813      CC_FLAGS_FTRACE	+= -mnop-mcount
 814      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
 815    endif
 816  endif
 817endif
 818ifdef CONFIG_HAVE_FENTRY
 819  ifeq ($(call cc-option-yn, -mfentry),y)
 820    CC_FLAGS_FTRACE	+= -mfentry
 821    CC_FLAGS_USING	+= -DCC_USING_FENTRY
 822  endif
 823endif
 824export CC_FLAGS_FTRACE
 825KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 826KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
 827ifdef CONFIG_DYNAMIC_FTRACE
 828	ifdef CONFIG_HAVE_C_RECORDMCOUNT
 829		BUILD_C_RECORDMCOUNT := y
 830		export BUILD_C_RECORDMCOUNT
 831	endif
 832endif
 833endif
 834
 835# We trigger additional mismatches with less inlining
 836ifdef CONFIG_DEBUG_SECTION_MISMATCH
 837KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 838endif
 839
 840ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 841KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 842LDFLAGS_vmlinux += --gc-sections
 843endif
 844
 845ifdef CONFIG_LIVEPATCH
 846KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 847endif
 848
 849# arch Makefile may override CC so keep this after arch Makefile is included
 850NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 
 851
 852# warn about C99 declaration after statement
 853KBUILD_CFLAGS += -Wdeclaration-after-statement
 854
 855# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 856KBUILD_CFLAGS += -Wvla
 857
 858# disable pointer signed / unsigned warnings in gcc 4.0
 859KBUILD_CFLAGS += -Wno-pointer-sign
 860
 861# disable stringop warnings in gcc 8+
 862KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 863
 864# disable invalid "can't wrap" optimizations for signed / pointers
 865KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
 866
 867# clang sets -fmerge-all-constants by default as optimization, but this
 868# is non-conforming behavior for C and in fact breaks the kernel, so we
 869# need to disable it here generally.
 870KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)
 871
 872# for gcc -fno-merge-all-constants disables everything, but it is fine
 873# to have actual conforming behavior enabled.
 874KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)
 875
 876# Make sure -fstack-check isn't enabled (like gentoo apparently did)
 877KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 878
 879# conserve stack if available
 880KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 881
 882# Prohibit date/time macros, which would make the build non-deterministic
 883KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 884
 885# enforce correct pointer usage
 886KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 887
 888# Require designated initializers for all marked structures
 889KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 890
 891# change __FILE__ to the relative path from the srctree
 892KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 893
 894# ensure -fcf-protection is disabled when using retpoline as it is
 895# incompatible with -mindirect-branch=thunk-extern
 896ifdef CONFIG_RETPOLINE
 897KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 898endif
 899
 900include scripts/Makefile.kasan
 901include scripts/Makefile.extrawarn
 902include scripts/Makefile.ubsan
 903
 904# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 905KBUILD_CPPFLAGS += $(KCPPFLAGS)
 906KBUILD_AFLAGS   += $(KAFLAGS)
 907KBUILD_CFLAGS   += $(KCFLAGS)
 908
 909KBUILD_LDFLAGS_MODULE += --build-id
 910LDFLAGS_vmlinux += --build-id
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 911
 912ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 913LDFLAGS_vmlinux	+= $(call ld-option, -X,)
 914endif
 915
 916ifeq ($(CONFIG_RELR),y)
 917LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
 918endif
 919
 920# make the checker run with the right architecture
 921CHECKFLAGS += --arch=$(ARCH)
 922
 923# insure the checker run with the right endianness
 924CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 925
 926# the checker needs the correct machine size
 927CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 928
 929# Default kernel image to build when no specific target is given.
 930# KBUILD_IMAGE may be overruled on the command line or
 931# set in the environment
 932# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 933# this default value
 934export KBUILD_IMAGE ?= vmlinux
 935
 936#
 937# INSTALL_PATH specifies where to place the updated kernel and system map
 938# images. Default is /boot, but you can set it to other values
 939export	INSTALL_PATH ?= /boot
 940
 941#
 942# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 943# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 944# an argument if needed. Otherwise it defaults to the kernel install path
 945#
 946export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 947
 948#
 949# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 950# relocations required by build roots.  This is not defined in the
 951# makefile but the argument can be passed to make if needed.
 952#
 953
 954MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 955export MODLIB
 956
 957#
 958# INSTALL_MOD_STRIP, if defined, will cause modules to be
 959# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 960# the default option --strip-debug will be used.  Otherwise,
 961# INSTALL_MOD_STRIP value will be used as the options to the strip command.
 962
 963ifdef INSTALL_MOD_STRIP
 964ifeq ($(INSTALL_MOD_STRIP),1)
 965mod_strip_cmd = $(STRIP) --strip-debug
 966else
 967mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 968endif # INSTALL_MOD_STRIP=1
 969else
 970mod_strip_cmd = true
 971endif # INSTALL_MOD_STRIP
 972export mod_strip_cmd
 973
 974# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 975# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 976# or CONFIG_MODULE_COMPRESS_XZ.
 977
 978mod_compress_cmd = true
 979ifdef CONFIG_MODULE_COMPRESS
 980  ifdef CONFIG_MODULE_COMPRESS_GZIP
 981    mod_compress_cmd = gzip -n -f
 982  endif # CONFIG_MODULE_COMPRESS_GZIP
 983  ifdef CONFIG_MODULE_COMPRESS_XZ
 984    mod_compress_cmd = xz -f
 985  endif # CONFIG_MODULE_COMPRESS_XZ
 986endif # CONFIG_MODULE_COMPRESS
 987export mod_compress_cmd
 988
 989ifdef CONFIG_MODULE_SIG_ALL
 990$(eval $(call config_filename,MODULE_SIG_KEY))
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 991
 992mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 993else
 994mod_sign_cmd = true
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 995endif
 996export mod_sign_cmd
 997
 998HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 999
1000ifdef CONFIG_STACK_VALIDATION
1001  has_libelf := $(call try-run,\
1002		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1003  ifeq ($(has_libelf),1)
1004    objtool_target := tools/objtool FORCE
1005  else
1006    SKIP_STACK_VALIDATION := 1
1007    export SKIP_STACK_VALIDATION
1008  endif
1009endif
1010
1011PHONY += prepare0
 
1012
1013export MODORDER := $(extmod-prefix)modules.order
 
1014
1015ifeq ($(KBUILD_EXTMOD),)
1016core-y		+= kernel certs mm fs ipc security crypto block
1017
1018vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1019		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1020		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1021
1022vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1023		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1024			$(drivers-) $(net-) $(libs-) $(virt-))))
1025
1026build-dirs	:= $(vmlinux-dirs)
1027clean-dirs	:= $(vmlinux-alldirs)
1028
1029init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
1030core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
1031drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
1032net-y		:= $(patsubst %/, %/built-in.a, $(net-y))
1033libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
1034libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1035virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
1036
1037# Externally visible symbols (used by link-vmlinux.sh)
1038export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1039			      $(drivers-y) $(net-y) $(virt-y)
1040export KBUILD_VMLINUX_LIBS := $(libs-y1)
1041export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1042export LDFLAGS_vmlinux
1043# used by scripts/Makefile.package
1044export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1045
1046vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1047
1048# Recurse until adjust_autoksyms.sh is satisfied
1049PHONY += autoksyms_recursive
1050ifdef CONFIG_TRIM_UNUSED_KSYMS
1051autoksyms_recursive: descend modules.order
1052	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1053	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1054endif
1055
1056# For the kernel to actually contain only the needed exported symbols,
1057# we have to build modules as well to determine what those symbols are.
1058# (this can be evaluated only once include/config/auto.conf has been included)
1059ifdef CONFIG_TRIM_UNUSED_KSYMS
1060  KBUILD_MODULES := 1
1061endif
1062
1063autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1064
1065$(autoksyms_h):
1066	$(Q)mkdir -p $(dir $@)
1067	$(Q)touch $@
1068
1069ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 
 
 
 
 
 
 
 
 
 
 
1070
1071# Final link of vmlinux with optional arch pass after final link
1072cmd_link-vmlinux =                                                 \
1073	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1074	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 
 
 
 
 
 
 
 
 
 
1075
1076vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1077	+$(call if_changed,link-vmlinux)
 
 
1078
1079targets := vmlinux
 
 
1080
1081# The actual objects are generated when descending,
1082# make sure no implicit rule kicks in
1083$(sort $(vmlinux-deps)): descend ;
1084
1085filechk_kernel.release = \
1086	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 
 
 
1087
1088# Store (new) KERNELRELEASE string in include/config/kernel.release
1089include/config/kernel.release: FORCE
1090	$(call filechk,kernel.release)
 
 
 
 
 
1091
1092# Additional helpers built in scripts
1093# Carefully list dependencies so we do not try to build scripts twice
1094# in parallel
1095PHONY += scripts
1096scripts: scripts_basic scripts_dtc
1097	$(Q)$(MAKE) $(build)=$(@)
1098
1099# Things we need to do before we recursively start building the kernel
1100# or the modules are listed in "prepare".
1101# A multi level approach is used. prepareN is processed before prepareN-1.
1102# archprepare is used in arch Makefiles and when processed asm symlink,
1103# version.h and scripts_basic is processed / created.
1104
1105PHONY += prepare archprepare
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1106
1107archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1108	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1109
1110prepare0: archprepare
1111	$(Q)$(MAKE) $(build)=scripts/mod
1112	$(Q)$(MAKE) $(build)=.
 
1113
1114# All the preparing..
1115prepare: prepare0 prepare-objtool
1116
1117# Support for using generic headers in asm-generic
1118asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1119
1120PHONY += asm-generic uapi-asm-generic
1121asm-generic: uapi-asm-generic
1122	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1123	generic=include/asm-generic
1124uapi-asm-generic:
1125	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1126	generic=include/uapi/asm-generic
1127
1128PHONY += prepare-objtool
1129prepare-objtool: $(objtool_target)
1130ifeq ($(SKIP_STACK_VALIDATION),1)
1131ifdef CONFIG_UNWINDER_ORC
1132	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1133	@false
1134else
1135	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1136endif
1137endif
1138
1139# Generate some files
1140# ---------------------------------------------------------------------------
1141
1142# KERNELRELEASE can change from a few different places, meaning version.h
1143# needs to be updated, so this check is forced on all builds
1144
1145uts_len := 64
1146define filechk_utsrelease.h
1147	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1148	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1149	  exit 1;                                                         \
1150	fi;                                                               \
1151	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1152endef
1153
1154define filechk_version.h
1155	echo \#define LINUX_VERSION_CODE $(shell                         \
1156	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1157	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1158endef
1159
1160$(version_h): FORCE
1161	$(call filechk,version.h)
1162	$(Q)rm -f $(old_version_h)
1163
1164include/generated/utsrelease.h: include/config/kernel.release FORCE
1165	$(call filechk,utsrelease.h)
1166
1167PHONY += headerdep
1168headerdep:
1169	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1170	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1171
1172# ---------------------------------------------------------------------------
1173# Kernel headers
1174
1175#Default location for installed headers
1176export INSTALL_HDR_PATH = $(objtree)/usr
1177
1178quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1179      cmd_headers_install = \
1180	mkdir -p $(INSTALL_HDR_PATH); \
1181	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1182	usr/include $(INSTALL_HDR_PATH)
1183
1184PHONY += headers_install
1185headers_install: headers
1186	$(call cmd,headers_install)
1187
1188PHONY += archheaders archscripts
1189
1190hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1191
1192PHONY += headers
1193headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1194	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1195	  $(error Headers not exportable for the $(SRCARCH) architecture))
1196	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1197	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1198
1199PHONY += headers_check
1200headers_check: headers
1201	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1202	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1203
1204ifdef CONFIG_HEADERS_INSTALL
1205prepare: headers
1206endif
1207
1208ifdef CONFIG_HEADERS_CHECK
1209all: headers_check
1210endif
1211
1212PHONY += scripts_unifdef
1213scripts_unifdef: scripts_basic
1214	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1215
1216# ---------------------------------------------------------------------------
1217# Kernel selftest
1218
1219PHONY += kselftest
1220kselftest:
1221	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1222
1223kselftest-%: FORCE
1224	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1225
1226PHONY += kselftest-merge
1227kselftest-merge:
1228	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1229	$(Q)find $(srctree)/tools/testing/selftests -name config | \
1230		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1231	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1232
1233# ---------------------------------------------------------------------------
1234# Devicetree files
1235
1236ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1237dtstree := arch/$(SRCARCH)/boot/dts
1238endif
1239
1240ifneq ($(dtstree),)
1241
1242%.dtb: include/config/kernel.release scripts_dtc
1243	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1244
1245PHONY += dtbs dtbs_install dt_binding_check
1246dtbs dtbs_check: include/config/kernel.release scripts_dtc
1247	$(Q)$(MAKE) $(build)=$(dtstree)
 
 
 
 
1248
1249dtbs_check: export CHECK_DTBS=1
1250dtbs_check: dt_binding_check
 
 
 
 
 
 
 
 
1251
1252dtbs_install:
1253	$(Q)$(MAKE) $(dtbinst)=$(dtstree)
1254
1255ifdef CONFIG_OF_EARLY_FLATTREE
1256all: dtbs
1257endif
1258
1259endif
1260
1261PHONY += scripts_dtc
1262scripts_dtc: scripts_basic
1263	$(Q)$(MAKE) $(build)=scripts/dtc
1264
1265dt_binding_check: scripts_dtc
1266	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1267
1268# ---------------------------------------------------------------------------
1269# Modules
1270
1271ifdef CONFIG_MODULES
1272
1273# By default, build modules as well
1274
1275all: modules
1276
1277# Build modules
1278#
1279# A module can be listed more than once in obj-m resulting in
1280# duplicate lines in modules.order files.  Those are removed
1281# using awk while concatenating to the final file.
1282
1283PHONY += modules
1284modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
 
 
1285	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1286	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1287
1288modules.order: descend
1289	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1290
1291modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
 
1292
1293modules.builtin: $(modbuiltin-dirs)
1294	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1295
1296PHONY += $(modbuiltin-dirs)
1297# tristate.conf is not included from this Makefile. Add it as a prerequisite
1298# here to make it self-healing in case somebody accidentally removes it.
1299$(modbuiltin-dirs): include/config/tristate.conf
1300	$(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1301
1302# Target to prepare building external modules
1303PHONY += modules_prepare
1304modules_prepare: prepare
1305
1306# Target to install modules
1307PHONY += modules_install
1308modules_install: _modinst_ _modinst_post
1309
1310PHONY += _modinst_
1311_modinst_:
1312	@rm -rf $(MODLIB)/kernel
1313	@rm -f $(MODLIB)/source
1314	@mkdir -p $(MODLIB)/kernel
1315	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1316	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1317		rm -f $(MODLIB)/build ; \
1318		ln -s $(CURDIR) $(MODLIB)/build ; \
1319	fi
1320	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1321	@sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1322	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1323	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1324
1325# This depmod is only for convenience to give the initial
1326# boot a modules.dep even before / is mounted read-write.  However the
1327# boot script depmod is the master version.
1328PHONY += _modinst_post
1329_modinst_post: _modinst_
 
1330	$(call cmd,depmod)
1331
1332ifeq ($(CONFIG_MODULE_SIG), y)
1333PHONY += modules_sign
1334modules_sign:
1335	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1336endif
1337
1338else # CONFIG_MODULES
1339
1340# Modules not configured
1341# ---------------------------------------------------------------------------
1342
1343PHONY += modules modules_install
1344modules modules_install:
1345	@echo >&2
1346	@echo >&2 "The present kernel configuration has modules disabled."
1347	@echo >&2 "Type 'make config' and enable loadable module support."
1348	@echo >&2 "Then build a kernel with module support enabled."
1349	@echo >&2
1350	@exit 1
1351
1352endif # CONFIG_MODULES
1353
1354###
1355# Cleaning is done on three levels.
1356# make clean     Delete most generated files
1357#                Leave enough to build external modules
1358# make mrproper  Delete the current configuration, and all generated files
1359# make distclean Remove editor backup files, patch leftover files and the like
1360
1361# Directories & files removed with 'make clean'
1362CLEAN_DIRS  += include/ksym
1363CLEAN_FILES += modules.builtin.modinfo
 
1364
1365# Directories & files removed with 'make mrproper'
1366MRPROPER_DIRS  += include/config include/generated          \
1367		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
1368		  debian/ snap/ tar-install/
1369MRPROPER_FILES += .config .config.old .version \
1370		  Module.symvers \
1371		  signing_key.pem signing_key.priv signing_key.x509	\
1372		  x509.genkey extra_certificates signing_key.x509.keyid	\
1373		  signing_key.x509.signer vmlinux-gdb.py \
1374		  *.spec
1375
1376# Directories & files removed with 'make distclean'
1377DISTCLEAN_DIRS  +=
1378DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1379
1380# clean - Delete most, but leave enough to build external modules
1381#
1382clean: rm-dirs  := $(CLEAN_DIRS)
1383clean: rm-files := $(CLEAN_FILES)
 
1384
1385PHONY += archclean vmlinuxclean
1386
1387vmlinuxclean:
1388	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1389	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1390
1391clean: archclean vmlinuxclean
1392
1393# mrproper - Delete all generated files, including .config
1394#
1395mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1396mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1397mrproper-dirs      := $(addprefix _mrproper_,scripts)
1398
1399PHONY += $(mrproper-dirs) mrproper
1400$(mrproper-dirs):
1401	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1402
1403mrproper: clean $(mrproper-dirs)
1404	$(call cmd,rmdirs)
1405	$(call cmd,rmfiles)
1406
1407# distclean
1408#
1409distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1410distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1411
1412PHONY += distclean
1413
1414distclean: mrproper
1415	$(call cmd,rmdirs)
1416	$(call cmd,rmfiles)
1417	@find $(srctree) $(RCS_FIND_IGNORE) \
1418		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1419		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1420		-o -name 'core' \) \
 
1421		-type f -print | xargs rm -f
1422
1423
1424# Packaging of the kernel to various formats
1425# ---------------------------------------------------------------------------
 
 
1426
1427%src-pkg: FORCE
1428	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1429%pkg: include/config/kernel.release FORCE
1430	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
 
 
 
1431
1432# Brief documentation of the typical targets used
1433# ---------------------------------------------------------------------------
1434
1435boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1436boards := $(sort $(notdir $(boards)))
1437board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1438board-dirs := $(sort $(notdir $(board-dirs:/=)))
1439
1440PHONY += help
1441help:
1442	@echo  'Cleaning targets:'
1443	@echo  '  clean		  - Remove most generated files but keep the config and'
1444	@echo  '                    enough build support to build external modules'
1445	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1446	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1447	@echo  ''
1448	@echo  'Configuration targets:'
1449	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1450	@echo  ''
1451	@echo  'Other generic targets:'
1452	@echo  '  all		  - Build all targets marked with [*]'
1453	@echo  '* vmlinux	  - Build the bare kernel'
1454	@echo  '* modules	  - Build all modules'
1455	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
 
 
1456	@echo  '  dir/            - Build all files in dir and below'
1457	@echo  '  dir/file.[ois]  - Build specified target only'
1458	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1459	@echo  '                    (requires compiler support for LLVM assembly generation)'
1460	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1461	@echo  '                    (requires a recent binutils and recent build (System.map))'
1462	@echo  '  dir/file.ko     - Build module including final link'
1463	@echo  '  modules_prepare - Set up for building external modules'
1464	@echo  '  tags/TAGS	  - Generate tags file for editors'
1465	@echo  '  cscope	  - Generate cscope index'
1466	@echo  '  gtags           - Generate GNU GLOBAL index'
1467	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1468	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1469	@echo  '  image_name	  - Output the image name (use with make -s)'
1470	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1471	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1472	 echo  ''
1473	@echo  'Static analysers:'
1474	@echo  '  checkstack      - Generate a list of stack hogs'
1475	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1476	@echo  '  versioncheck    - Sanity check on version.h usage'
1477	@echo  '  includecheck    - Check for duplicate included header files'
1478	@echo  '  export_report   - List the usages of all exported symbols'
1479	@echo  '  headers_check   - Sanity check on exported headers'
1480	@echo  '  headerdep       - Detect inclusion cycles in headers'
1481	@echo  '  coccicheck      - Check with Coccinelle'
1482	@echo  ''
1483	@echo  'Tools:'
1484	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1485	@echo  ''
1486	@echo  'Kernel selftest:'
1487	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1488	@echo  '                    Build, install, and boot kernel before'
1489	@echo  '                    running kselftest on it'
1490	@echo  '  kselftest-clean - Remove all generated kselftest files'
1491	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1492	@echo  '                    .config.'
1493	@echo  ''
1494	@$(if $(dtstree), \
1495		echo 'Devicetree:'; \
1496		echo '* dtbs             - Build device tree blobs for enabled boards'; \
1497		echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1498		echo '  dt_binding_check - Validate device tree binding documents'; \
1499		echo '  dtbs_check       - Validate device tree source files';\
1500		echo '')
1501
1502	@echo 'Userspace tools targets:'
1503	@echo '  use "make tools/help"'
1504	@echo '  or  "cd tools; make help"'
1505	@echo  ''
1506	@echo  'Kernel packaging:'
1507	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
1508	@echo  ''
1509	@echo  'Documentation targets:'
1510	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1511	@echo  ''
1512	@echo  'Architecture specific targets ($(SRCARCH)):'
1513	@$(if $(archhelp),$(archhelp),\
1514		echo '  No architecture specific help defined for $(SRCARCH)')
1515	@echo  ''
1516	@$(if $(boards), \
1517		$(foreach b, $(boards), \
1518		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1519		echo '')
1520	@$(if $(board-dirs), \
1521		$(foreach b, $(board-dirs), \
1522		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1523		printf "  %-16s - Show all of the above\\n" help-boards; \
1524		echo '')
1525
1526	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1527	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1528	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1529	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1530	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1531	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1532	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1533	@echo  '		1: warnings which may be relevant and do not occur too often'
1534	@echo  '		2: warnings which occur quite often but may still be relevant'
1535	@echo  '		3: more obscure warnings, can most likely be ignored'
1536	@echo  '		Multiple levels can be combined with W=12 or W=123'
 
1537	@echo  ''
1538	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1539	@echo  'For further info see the ./README file'
1540
1541
1542help-board-dirs := $(addprefix help-,$(board-dirs))
1543
1544help-boards: $(help-board-dirs)
1545
1546boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1547
1548$(help-board-dirs): help-%:
1549	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1550	@$(if $(boards-per-dir), \
1551		$(foreach b, $(boards-per-dir), \
1552		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1553		echo '')
1554
1555
1556# Documentation targets
1557# ---------------------------------------------------------------------------
1558DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1559	       linkcheckdocs dochelp refcheckdocs
1560PHONY += $(DOC_TARGETS)
1561$(DOC_TARGETS):
1562	$(Q)$(MAKE) $(build)=Documentation $@
1563
1564# Misc
1565# ---------------------------------------------------------------------------
1566
1567PHONY += scripts_gdb
1568scripts_gdb: prepare0
1569	$(Q)$(MAKE) $(build)=scripts/gdb
1570	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1571
1572ifdef CONFIG_GDB_SCRIPTS
1573all: scripts_gdb
1574endif
1575
1576else # KBUILD_EXTMOD
1577
1578###
1579# External module support.
1580# When building external modules the kernel used as basis is considered
1581# read-only, and no consistency checks are made and the make
1582# system is not used on the basis kernel. If updates are required
1583# in the basis kernel ordinary make commands (without M=...) must
1584# be used.
1585#
1586# The following are the only valid targets when building external
1587# modules.
1588# make M=dir clean     Delete all automatically generated files
1589# make M=dir modules   Make all modules in specified dir
1590# make M=dir	       Same as 'make M=dir modules'
1591# make M=dir modules_install
1592#                      Install the modules built in the module directory
1593#                      Assumes install directory is already created
1594
1595# We are always building modules
1596KBUILD_MODULES := 1
 
 
 
1597
1598PHONY += $(objtree)/Module.symvers
1599$(objtree)/Module.symvers:
1600	@test -e $(objtree)/Module.symvers || ( \
1601	echo; \
1602	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1603	echo "           is missing; modules will have no dependencies and modversions."; \
1604	echo )
1605
1606build-dirs := $(KBUILD_EXTMOD)
1607PHONY += modules
1608modules: descend $(objtree)/Module.symvers
 
 
 
 
1609	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1610
1611PHONY += modules_install
1612modules_install: _emodinst_ _emodinst_post
1613
1614install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1615PHONY += _emodinst_
1616_emodinst_:
1617	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1618	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1619
1620PHONY += _emodinst_post
1621_emodinst_post: _emodinst_
1622	$(call cmd,depmod)
1623
1624clean-dirs := $(KBUILD_EXTMOD)
 
 
 
 
 
 
1625clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1626
1627PHONY += /
1628/:
1629	@echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1630
1631PHONY += help
1632help:
1633	@echo  '  Building external modules.'
1634	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1635	@echo  ''
1636	@echo  '  modules         - default target, build the module(s)'
1637	@echo  '  modules_install - install the module'
1638	@echo  '  clean           - remove generated files in module directory only'
1639	@echo  ''
1640
1641PHONY += prepare
 
 
 
1642endif # KBUILD_EXTMOD
1643
1644# Handle descending into subdirectories listed in $(build-dirs)
1645# Preset locale variables to speed up the build process. Limit locale
1646# tweaks to this spot to avoid wrong language settings when running
1647# make menuconfig etc.
1648# Error messages still appears in the original language
1649PHONY += descend $(build-dirs)
1650descend: $(build-dirs)
1651$(build-dirs): prepare
1652	$(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1
1653
1654clean-dirs := $(addprefix _clean_, $(clean-dirs))
1655PHONY += $(clean-dirs) clean
1656$(clean-dirs):
1657	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1658
1659clean: $(clean-dirs)
1660	$(call cmd,rmdirs)
1661	$(call cmd,rmfiles)
1662	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1663		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1664		-o -name '*.ko.*' \
1665		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1666		-o -name '*.dwo' -o -name '*.lst' \
1667		-o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \
1668		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1669		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1670		-o -name '*.asn1.[ch]' \
1671		-o -name '*.symtypes' -o -name 'modules.order' \
1672		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1673		-o -name '*.c.[012]*.*' \
1674		-o -name '*.ll' \
1675		-o -name '*.gcno' \) -type f -print | xargs rm -f
1676
1677# Generate tags for editors
1678# ---------------------------------------------------------------------------
1679quiet_cmd_tags = GEN     $@
1680      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1681
1682tags TAGS cscope gtags: FORCE
1683	$(call cmd,tags)
1684
1685# Script to generate missing namespace dependencies
1686# ---------------------------------------------------------------------------
1687
1688PHONY += nsdeps
1689
1690nsdeps: modules
1691	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps
1692	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1693
1694# Scripts to check various things for consistency
1695# ---------------------------------------------------------------------------
1696
1697PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1698
1699includecheck:
1700	find $(srctree)/* $(RCS_FIND_IGNORE) \
1701		-name '*.[hcS]' -type f -print | sort \
1702		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1703
1704versioncheck:
1705	find $(srctree)/* $(RCS_FIND_IGNORE) \
1706		-name '*.[hcS]' -type f -print | sort \
1707		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1708
1709coccicheck:
1710	$(Q)$(BASH) $(srctree)/scripts/$@
1711
1712namespacecheck:
1713	$(PERL) $(srctree)/scripts/namespace.pl
1714
1715export_report:
1716	$(PERL) $(srctree)/scripts/export_report.pl
1717
1718PHONY += checkstack kernelrelease kernelversion image_name
 
 
 
1719
1720# UML needs a little special treatment here.  It wants to use the host
1721# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1722# else wants $(ARCH), including people doing cross-builds, which means
1723# that $(SUBARCH) doesn't work here.
1724ifeq ($(ARCH), um)
1725CHECKSTACK_ARCH := $(SUBARCH)
1726else
1727CHECKSTACK_ARCH := $(ARCH)
1728endif
1729checkstack:
1730	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1731	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1732
1733kernelrelease:
1734	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1735
1736kernelversion:
1737	@echo $(KERNELVERSION)
1738
1739image_name:
1740	@echo $(KBUILD_IMAGE)
1741
1742# Clear a bunch of variables before executing the submake
1743
1744ifeq ($(quiet),silent_)
1745tools_silent=s
1746endif
1747
1748tools/: FORCE
1749	$(Q)mkdir -p $(objtree)/tools
1750	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1751
1752tools/%: FORCE
1753	$(Q)mkdir -p $(objtree)/tools
1754	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1755
1756# Single targets
1757# ---------------------------------------------------------------------------
1758# To build individual files in subdirectories, you can do like this:
1759#
1760#   make foo/bar/baz.s
1761#
1762# The supported suffixes for single-target are listed in 'single-targets'
1763#
1764# To build only under specific subdirectories, you can do like this:
1765#
1766#   make foo/bar/baz/
1767
1768ifdef single-build
1769
1770single-all := $(filter $(single-targets), $(MAKECMDGOALS))
1771
1772# .ko is special because modpost is needed
1773single-ko := $(sort $(filter %.ko, $(single-all)))
1774single-no-ko := $(sort $(patsubst %.ko,%.mod, $(single-all)))
1775
1776$(single-ko): single_modpost
1777	@:
1778$(single-no-ko): descend
1779	@:
1780
1781ifeq ($(KBUILD_EXTMOD),)
1782# For the single build of in-tree modules, use a temporary file to avoid
1783# the situation of modules_install installing an invalid modules.order.
1784MODORDER := .modules.tmp
1785endif
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1786
1787PHONY += single_modpost
1788single_modpost: $(single-no-ko)
1789	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
 
 
 
 
 
 
 
 
 
 
1790	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1791
1792KBUILD_MODULES := 1
1793
1794export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1795
1796single-build = $(if $(filter-out $@/, $(single-no-ko)),1)
1797
1798endif
1799
1800# FIXME Should go into a make.lib or something
1801# ===========================================================================
1802
1803quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1804      cmd_rmdirs = rm -rf $(rm-dirs)
1805
1806quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1807      cmd_rmfiles = rm -f $(rm-files)
1808
1809# Run depmod only if we have System.map and depmod is executable
1810quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1811      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1812                   $(KERNELRELEASE)
1813
1814# read saved command lines for existing targets
1815existing-targets := $(wildcard $(sort $(targets)))
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1816
1817-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
 
 
 
1818
1819endif # config-targets
1820endif # mixed-build
1821endif # need-sub-make
1822
1823PHONY += FORCE
1824FORCE:
1825
1826# Declare the contents of the PHONY variable as phony.  We keep that
1827# information in a variable so we can use it in if_changed and friends.
1828.PHONY: $(PHONY)