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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: $(PHONY)
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 9
4SUBLEVEL = 0
5EXTRAVERSION =
6NAME = Kleptomaniac Octopus
7
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
14$(if $(filter __%, $(MAKECMDGOALS)), \
15 $(error targets prefixed with '__' are only for internal use))
16
17# That's our default target when none is given on the command line
18PHONY := __all
19__all:
20
21# We are using a recursive build, so we need to do a little thinking
22# to get the ordering right.
23#
24# Most importantly: sub-Makefiles should only ever modify files in
25# their own directory. If in some directory we have a dependency on
26# a file in another dir (which doesn't happen often, but it's often
27# unavoidable when linking the built-in.a targets which finally
28# turn into vmlinux), we will call a sub make in that other dir, and
29# after that we are sure that everything which is in that other dir
30# is now up to date.
31#
32# The only cases where we need to modify files which have global
33# effects are thus separated out and done before the recursive
34# descending is started. They are now explicitly listed as the
35# prepare rule.
36
37ifneq ($(sub_make_done),1)
38
39# Do not use make's built-in rules and variables
40# (this increases performance and avoids hard-to-debug behaviour)
41MAKEFLAGS += -rR
42
43# Avoid funny character set dependencies
44unexport LC_ALL
45LC_COLLATE=C
46LC_NUMERIC=C
47export LC_COLLATE LC_NUMERIC
48
49# Avoid interference with shell env settings
50unexport GREP_OPTIONS
51
52# Beautify output
53# ---------------------------------------------------------------------------
54#
55# Normally, we echo the whole command before executing it. By making
56# that echo $($(quiet)$(cmd)), we now have the possibility to set
57# $(quiet) to choose other forms of output instead, e.g.
58#
59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
61#
62# If $(quiet) is empty, the whole command will be printed.
63# If it is set to "quiet_", only the short version will be printed.
64# If it is set to "silent_", nothing will be printed at all, since
65# the variable $(silent_cmd_cc_o_c) doesn't exist.
66#
67# A simple variant is to prefix commands with $(Q) - that's useful
68# for commands that shall be hidden in non-verbose mode.
69#
70# $(Q)ln $@ :<
71#
72# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73# If KBUILD_VERBOSE equals 1 then the above command is displayed.
74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
75#
76# To put more focus on warnings, be less verbose as default
77# Use 'make V=1' to see the full commands
78
79ifeq ("$(origin V)", "command line")
80 KBUILD_VERBOSE = $(V)
81endif
82ifndef KBUILD_VERBOSE
83 KBUILD_VERBOSE = 0
84endif
85
86ifeq ($(KBUILD_VERBOSE),1)
87 quiet =
88 Q =
89else
90 quiet=quiet_
91 Q = @
92endif
93
94# If the user is running make -s (silent mode), suppress echoing of
95# commands
96
97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
98 quiet=silent_
99endif
100
101export quiet Q KBUILD_VERBOSE
102
103# Kbuild will save output files in the current working directory.
104# This does not need to match to the root of the kernel source tree.
105#
106# For example, you can do this:
107#
108# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
109#
110# If you want to save output files in a different location, there are
111# two syntaxes to specify it.
112#
113# 1) O=
114# Use "make O=dir/to/store/output/files/"
115#
116# 2) Set KBUILD_OUTPUT
117# Set the environment variable KBUILD_OUTPUT to point to the output directory.
118# export KBUILD_OUTPUT=dir/to/store/output/files/; make
119#
120# The O= assignment takes precedence over the KBUILD_OUTPUT environment
121# variable.
122
123# Do we want to change the working directory?
124ifeq ("$(origin O)", "command line")
125 KBUILD_OUTPUT := $(O)
126endif
127
128ifneq ($(KBUILD_OUTPUT),)
129# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
130# expand a shell special character '~'. We use a somewhat tedious way here.
131abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
132$(if $(abs_objtree),, \
133 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
134
135# $(realpath ...) resolves symlinks
136abs_objtree := $(realpath $(abs_objtree))
137else
138abs_objtree := $(CURDIR)
139endif # ifneq ($(KBUILD_OUTPUT),)
140
141ifeq ($(abs_objtree),$(CURDIR))
142# Suppress "Entering directory ..." unless we are changing the work directory.
143MAKEFLAGS += --no-print-directory
144else
145need-sub-make := 1
146endif
147
148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
149
150ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
151$(error source directory cannot contain spaces or colons)
152endif
153
154ifneq ($(abs_srctree),$(abs_objtree))
155# Look for make include files relative to root of kernel src
156#
157# This does not become effective immediately because MAKEFLAGS is re-parsed
158# once after the Makefile is read. We need to invoke sub-make.
159MAKEFLAGS += --include-dir=$(abs_srctree)
160need-sub-make := 1
161endif
162
163this-makefile := $(lastword $(MAKEFILE_LIST))
164
165ifneq ($(filter 3.%,$(MAKE_VERSION)),)
166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
167# We need to invoke sub-make to avoid implicit rules in the top Makefile.
168need-sub-make := 1
169# Cancel implicit rules for this Makefile.
170$(this-makefile): ;
171endif
172
173export abs_srctree abs_objtree
174export sub_make_done := 1
175
176ifeq ($(need-sub-make),1)
177
178PHONY += $(MAKECMDGOALS) __sub-make
179
180$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
181 @:
182
183# Invoke a second make in the output directory, passing relevant variables
184__sub-make:
185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
186
187endif # need-sub-make
188endif # sub_make_done
189
190# We process the rest of the Makefile if this is the final invocation of make
191ifeq ($(need-sub-make),)
192
193# Do not print "Entering directory ...",
194# but we want to display it when entering to the output directory
195# so that IDEs/editors are able to understand relative filenames.
196MAKEFLAGS += --no-print-directory
197
198# Call a source code checker (by default, "sparse") as part of the
199# C compilation.
200#
201# Use 'make C=1' to enable checking of only re-compiled files.
202# Use 'make C=2' to enable checking of *all* source files, regardless
203# of whether they are re-compiled or not.
204#
205# See the file "Documentation/dev-tools/sparse.rst" for more details,
206# including where to get the "sparse" utility.
207
208ifeq ("$(origin C)", "command line")
209 KBUILD_CHECKSRC = $(C)
210endif
211ifndef KBUILD_CHECKSRC
212 KBUILD_CHECKSRC = 0
213endif
214
215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
216# directory of external module to build. Setting M= takes precedence.
217ifeq ("$(origin M)", "command line")
218 KBUILD_EXTMOD := $(M)
219endif
220
221$(if $(word 2, $(KBUILD_EXTMOD)), \
222 $(error building multiple external modules is not supported))
223
224export KBUILD_CHECKSRC KBUILD_EXTMOD
225
226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
227
228ifeq ($(abs_srctree),$(abs_objtree))
229 # building in the source tree
230 srctree := .
231 building_out_of_srctree :=
232else
233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
234 # building in a subdirectory of the source tree
235 srctree := ..
236 else
237 srctree := $(abs_srctree)
238 endif
239 building_out_of_srctree := 1
240endif
241
242ifneq ($(KBUILD_ABS_SRCTREE),)
243srctree := $(abs_srctree)
244endif
245
246objtree := .
247VPATH := $(srctree)
248
249export building_out_of_srctree srctree objtree VPATH
250
251# To make sure we do not include .config for any of the *config targets
252# catch them early, and hand them over to scripts/kconfig/Makefile
253# It is allowed to specify more targets when calling make, including
254# mixing *config targets and build targets.
255# For example 'make oldconfig all'.
256# Detect when mixed targets is specified, and make a second invocation
257# of make so .config is not included in this case either (for *config).
258
259version_h := include/generated/uapi/linux/version.h
260old_version_h := include/linux/version.h
261
262clean-targets := %clean mrproper cleandocs
263no-dot-config-targets := $(clean-targets) \
264 cscope gtags TAGS tags help% %docs check% coccicheck \
265 $(version_h) headers headers_% archheaders archscripts \
266 %asm-generic kernelversion %src-pkg dt_binding_check \
267 outputmakefile
268no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease
269single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
270
271config-build :=
272mixed-build :=
273need-config := 1
274may-sync-config := 1
275single-build :=
276
277ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
278 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
279 need-config :=
280 endif
281endif
282
283ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
284 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
285 may-sync-config :=
286 endif
287endif
288
289ifneq ($(KBUILD_EXTMOD),)
290 may-sync-config :=
291endif
292
293ifeq ($(KBUILD_EXTMOD),)
294 ifneq ($(filter %config,$(MAKECMDGOALS)),)
295 config-build := 1
296 ifneq ($(words $(MAKECMDGOALS)),1)
297 mixed-build := 1
298 endif
299 endif
300endif
301
302# We cannot build single targets and the others at the same time
303ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
304 single-build := 1
305 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
306 mixed-build := 1
307 endif
308endif
309
310# For "make -j clean all", "make -j mrproper defconfig all", etc.
311ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
312 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
313 mixed-build := 1
314 endif
315endif
316
317# install and modules_install need also be processed one by one
318ifneq ($(filter install,$(MAKECMDGOALS)),)
319 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
320 mixed-build := 1
321 endif
322endif
323
324ifdef mixed-build
325# ===========================================================================
326# We're called with mixed targets (*config and build targets).
327# Handle them one by one.
328
329PHONY += $(MAKECMDGOALS) __build_one_by_one
330
331$(MAKECMDGOALS): __build_one_by_one
332 @:
333
334__build_one_by_one:
335 $(Q)set -e; \
336 for i in $(MAKECMDGOALS); do \
337 $(MAKE) -f $(srctree)/Makefile $$i; \
338 done
339
340else # !mixed-build
341
342include scripts/Kbuild.include
343
344# Read KERNELRELEASE from include/config/kernel.release (if it exists)
345KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
346KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
347export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
348
349include scripts/subarch.include
350
351# Cross compiling and selecting different set of gcc/bin-utils
352# ---------------------------------------------------------------------------
353#
354# When performing cross compilation for other architectures ARCH shall be set
355# to the target architecture. (See arch/* for the possibilities).
356# ARCH can be set during invocation of make:
357# make ARCH=ia64
358# Another way is to have ARCH set in the environment.
359# The default ARCH is the host where make is executed.
360
361# CROSS_COMPILE specify the prefix used for all executables used
362# during compilation. Only gcc and related bin-utils executables
363# are prefixed with $(CROSS_COMPILE).
364# CROSS_COMPILE can be set on the command line
365# make CROSS_COMPILE=ia64-linux-
366# Alternatively CROSS_COMPILE can be set in the environment.
367# Default value for CROSS_COMPILE is not to prefix executables
368# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
369ARCH ?= $(SUBARCH)
370
371# Architecture as present in compile.h
372UTS_MACHINE := $(ARCH)
373SRCARCH := $(ARCH)
374
375# Additional ARCH settings for x86
376ifeq ($(ARCH),i386)
377 SRCARCH := x86
378endif
379ifeq ($(ARCH),x86_64)
380 SRCARCH := x86
381endif
382
383# Additional ARCH settings for sparc
384ifeq ($(ARCH),sparc32)
385 SRCARCH := sparc
386endif
387ifeq ($(ARCH),sparc64)
388 SRCARCH := sparc
389endif
390
391# Additional ARCH settings for sh
392ifeq ($(ARCH),sh64)
393 SRCARCH := sh
394endif
395
396KCONFIG_CONFIG ?= .config
397export KCONFIG_CONFIG
398
399# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
400export KBUILD_DEFCONFIG := defconfig
401
402# SHELL used by kbuild
403CONFIG_SHELL := sh
404
405HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
406HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
407HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
408
409ifneq ($(LLVM),)
410HOSTCC = clang
411HOSTCXX = clang++
412else
413HOSTCC = gcc
414HOSTCXX = g++
415endif
416
417export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
418 -O2 -fomit-frame-pointer -std=gnu89
419export KBUILD_USERLDFLAGS :=
420
421KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
422KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
423KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
424KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
425
426# Make variables (CC, etc...)
427CPP = $(CC) -E
428ifneq ($(LLVM),)
429CC = clang
430LD = ld.lld
431AR = llvm-ar
432NM = llvm-nm
433OBJCOPY = llvm-objcopy
434OBJDUMP = llvm-objdump
435READELF = llvm-readelf
436OBJSIZE = llvm-size
437STRIP = llvm-strip
438else
439CC = $(CROSS_COMPILE)gcc
440LD = $(CROSS_COMPILE)ld
441AR = $(CROSS_COMPILE)ar
442NM = $(CROSS_COMPILE)nm
443OBJCOPY = $(CROSS_COMPILE)objcopy
444OBJDUMP = $(CROSS_COMPILE)objdump
445READELF = $(CROSS_COMPILE)readelf
446OBJSIZE = $(CROSS_COMPILE)size
447STRIP = $(CROSS_COMPILE)strip
448endif
449PAHOLE = pahole
450RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
451LEX = flex
452YACC = bison
453AWK = awk
454INSTALLKERNEL := installkernel
455DEPMOD = /sbin/depmod
456PERL = perl
457PYTHON = python
458PYTHON3 = python3
459CHECK = sparse
460BASH = bash
461KGZIP = gzip
462KBZIP2 = bzip2
463KLZOP = lzop
464LZMA = lzma
465LZ4 = lz4c
466XZ = xz
467ZSTD = zstd
468
469CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
470 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
471NOSTDINC_FLAGS :=
472CFLAGS_MODULE =
473AFLAGS_MODULE =
474LDFLAGS_MODULE =
475CFLAGS_KERNEL =
476AFLAGS_KERNEL =
477LDFLAGS_vmlinux =
478
479# Use USERINCLUDE when you must reference the UAPI directories only.
480USERINCLUDE := \
481 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
482 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
483 -I$(srctree)/include/uapi \
484 -I$(objtree)/include/generated/uapi \
485 -include $(srctree)/include/linux/kconfig.h
486
487# Use LINUXINCLUDE when you must reference the include directory.
488# Needed to be compatible with the O= option
489LINUXINCLUDE := \
490 -I$(srctree)/arch/$(SRCARCH)/include \
491 -I$(objtree)/arch/$(SRCARCH)/include/generated \
492 $(if $(building_out_of_srctree),-I$(srctree)/include) \
493 -I$(objtree)/include \
494 $(USERINCLUDE)
495
496KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
497KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
498 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
499 -Werror=implicit-function-declaration -Werror=implicit-int \
500 -Wno-format-security \
501 -std=gnu89
502KBUILD_CPPFLAGS := -D__KERNEL__
503KBUILD_AFLAGS_KERNEL :=
504KBUILD_CFLAGS_KERNEL :=
505KBUILD_AFLAGS_MODULE := -DMODULE
506KBUILD_CFLAGS_MODULE := -DMODULE
507KBUILD_LDFLAGS_MODULE :=
508export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
509KBUILD_LDFLAGS :=
510CLANG_FLAGS :=
511
512export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
513export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
514export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
515export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
516export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
517
518export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
519export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
520export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN
521export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
522export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
523export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
524
525# Files to ignore in find ... statements
526
527export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
528 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
529 -prune -o
530export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
531 --exclude CVS --exclude .pc --exclude .hg --exclude .git
532
533# ===========================================================================
534# Rules shared between *config targets and build targets
535
536# Basic helpers built in scripts/basic
537PHONY += scripts_basic
538scripts_basic:
539 $(Q)$(MAKE) $(build)=scripts/basic
540 $(Q)rm -f .tmp_quiet_recordmcount
541
542PHONY += outputmakefile
543# Before starting out-of-tree build, make sure the source tree is clean.
544# outputmakefile generates a Makefile in the output directory, if using a
545# separate output directory. This allows convenient use of make in the
546# output directory.
547# At the same time when output Makefile generated, generate .gitignore to
548# ignore whole output directory
549outputmakefile:
550ifdef building_out_of_srctree
551 $(Q)if [ -f $(srctree)/.config -o \
552 -d $(srctree)/include/config -o \
553 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
554 echo >&2 "***"; \
555 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
556 echo >&2 "*** in $(abs_srctree)";\
557 echo >&2 "***"; \
558 false; \
559 fi
560 $(Q)ln -fsn $(srctree) source
561 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
562 $(Q)test -e .gitignore || \
563 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
564endif
565
566ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
567ifneq ($(CROSS_COMPILE),)
568CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
569GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
570CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
571GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
572endif
573ifneq ($(GCC_TOOLCHAIN),)
574CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
575endif
576ifneq ($(LLVM_IAS),1)
577CLANG_FLAGS += -no-integrated-as
578endif
579CLANG_FLAGS += -Werror=unknown-warning-option
580KBUILD_CFLAGS += $(CLANG_FLAGS)
581KBUILD_AFLAGS += $(CLANG_FLAGS)
582export CLANG_FLAGS
583endif
584
585# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
586# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
587# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
588# and from include/config/auto.conf.cmd to detect the compiler upgrade.
589CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
590
591ifdef config-build
592# ===========================================================================
593# *config targets only - make sure prerequisites are updated, and descend
594# in scripts/kconfig to make the *config target
595
596# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
597# KBUILD_DEFCONFIG may point out an alternative default configuration
598# used for 'make defconfig'
599include arch/$(SRCARCH)/Makefile
600export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
601
602config: outputmakefile scripts_basic FORCE
603 $(Q)$(MAKE) $(build)=scripts/kconfig $@
604
605%config: outputmakefile scripts_basic FORCE
606 $(Q)$(MAKE) $(build)=scripts/kconfig $@
607
608else #!config-build
609# ===========================================================================
610# Build targets only - this includes vmlinux, arch specific targets, clean
611# targets and others. In general all targets except *config targets.
612
613# If building an external module we do not care about the all: rule
614# but instead __all depend on modules
615PHONY += all
616ifeq ($(KBUILD_EXTMOD),)
617__all: all
618else
619__all: modules
620endif
621
622# Decide whether to build built-in, modular, or both.
623# Normally, just do built-in.
624
625KBUILD_MODULES :=
626KBUILD_BUILTIN := 1
627
628# If we have only "make modules", don't compile built-in objects.
629ifeq ($(MAKECMDGOALS),modules)
630 KBUILD_BUILTIN :=
631endif
632
633# If we have "make <whatever> modules", compile modules
634# in addition to whatever we do anyway.
635# Just "make" or "make all" shall build modules as well
636
637ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),)
638 KBUILD_MODULES := 1
639endif
640
641ifeq ($(MAKECMDGOALS),)
642 KBUILD_MODULES := 1
643endif
644
645export KBUILD_MODULES KBUILD_BUILTIN
646
647ifdef need-config
648include include/config/auto.conf
649endif
650
651ifeq ($(KBUILD_EXTMOD),)
652# Objects we will link into vmlinux / subdirs we need to visit
653core-y := init usr
654drivers-y := drivers sound
655drivers-$(CONFIG_SAMPLES) += samples
656drivers-y += net virt
657libs-y := lib
658endif # KBUILD_EXTMOD
659
660# The all: target is the default when no target is given on the
661# command line.
662# This allow a user to issue only 'make' to build a kernel including modules
663# Defaults to vmlinux, but the arch makefile usually adds further targets
664all: vmlinux
665
666CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
667 $(call cc-option,-fno-tree-loop-im) \
668 $(call cc-disable-warning,maybe-uninitialized,)
669export CFLAGS_GCOV
670
671# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
672ifdef CONFIG_FUNCTION_TRACER
673 CC_FLAGS_FTRACE := -pg
674endif
675
676RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
677RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
678RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
679RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
680RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
681RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
682export RETPOLINE_CFLAGS
683export RETPOLINE_VDSO_CFLAGS
684
685include arch/$(SRCARCH)/Makefile
686
687ifdef need-config
688ifdef may-sync-config
689# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
690# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
691# because some architectures define CROSS_COMPILE there.
692include include/config/auto.conf.cmd
693
694$(KCONFIG_CONFIG):
695 @echo >&2 '***'
696 @echo >&2 '*** Configuration file "$@" not found!'
697 @echo >&2 '***'
698 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
699 @echo >&2 '*** "make menuconfig" or "make xconfig").'
700 @echo >&2 '***'
701 @/bin/false
702
703# The actual configuration files used during the build are stored in
704# include/generated/ and include/config/. Update them if .config is newer than
705# include/config/auto.conf (which mirrors .config).
706#
707# This exploits the 'multi-target pattern rule' trick.
708# The syncconfig should be executed only once to make all the targets.
709# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
710%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
711 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
712else # !may-sync-config
713# External modules and some install targets need include/generated/autoconf.h
714# and include/config/auto.conf but do not care if they are up-to-date.
715# Use auto.conf to trigger the test
716PHONY += include/config/auto.conf
717
718include/config/auto.conf:
719 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
720 echo >&2; \
721 echo >&2 " ERROR: Kernel configuration is invalid."; \
722 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
723 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
724 echo >&2 ; \
725 /bin/false)
726
727endif # may-sync-config
728endif # need-config
729
730KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
731KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
732KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
733KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
734KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
735
736ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
737KBUILD_CFLAGS += -O2
738else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
739KBUILD_CFLAGS += -O3
740else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
741KBUILD_CFLAGS += -Os
742endif
743
744# Tell gcc to never replace conditional load with a non-conditional one
745KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
746KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
747
748ifdef CONFIG_READABLE_ASM
749# Disable optimizations that make assembler listings hard to read.
750# reorder blocks reorders the control in the function
751# ipa clone creates specialized cloned functions
752# partial inlining inlines only parts of functions
753KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
754 $(call cc-option,-fno-ipa-cp-clone,) \
755 $(call cc-option,-fno-partial-inlining)
756endif
757
758ifneq ($(CONFIG_FRAME_WARN),0)
759KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
760endif
761
762stackp-flags-y := -fno-stack-protector
763stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
764stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
765
766KBUILD_CFLAGS += $(stackp-flags-y)
767
768ifdef CONFIG_CC_IS_CLANG
769KBUILD_CPPFLAGS += -Qunused-arguments
770KBUILD_CFLAGS += -Wno-format-invalid-specifier
771KBUILD_CFLAGS += -Wno-gnu
772# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
773# source of a reference will be _MergedGlobals and not on of the whitelisted names.
774# See modpost pattern 2
775KBUILD_CFLAGS += -mno-global-merge
776else
777
778# These warnings generated too much noise in a regular build.
779# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
780KBUILD_CFLAGS += -Wno-unused-but-set-variable
781
782# Warn about unmarked fall-throughs in switch statement.
783# Disabled for clang while comment to attribute conversion happens and
784# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
785KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
786endif
787
788KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
789ifdef CONFIG_FRAME_POINTER
790KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
791else
792# Some targets (ARM with Thumb2, for example), can't be built with frame
793# pointers. For those, we don't have FUNCTION_TRACER automatically
794# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
795# incompatible with -fomit-frame-pointer with current GCC, so we don't use
796# -fomit-frame-pointer with FUNCTION_TRACER.
797ifndef CONFIG_FUNCTION_TRACER
798KBUILD_CFLAGS += -fomit-frame-pointer
799endif
800endif
801
802# Initialize all stack variables with a 0xAA pattern.
803ifdef CONFIG_INIT_STACK_ALL_PATTERN
804KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
805endif
806
807# Initialize all stack variables with a zero value.
808ifdef CONFIG_INIT_STACK_ALL_ZERO
809# Future support for zero initialization is still being debated, see
810# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
811# renamed or dropped.
812KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
813KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
814endif
815
816DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
817
818ifdef CONFIG_DEBUG_INFO
819ifdef CONFIG_DEBUG_INFO_SPLIT
820DEBUG_CFLAGS += -gsplit-dwarf
821else
822DEBUG_CFLAGS += -g
823endif
824KBUILD_AFLAGS += -Wa,-gdwarf-2
825endif
826ifdef CONFIG_DEBUG_INFO_DWARF4
827DEBUG_CFLAGS += -gdwarf-4
828endif
829
830ifdef CONFIG_DEBUG_INFO_REDUCED
831DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
832 $(call cc-option,-fno-var-tracking)
833endif
834
835ifdef CONFIG_DEBUG_INFO_COMPRESSED
836DEBUG_CFLAGS += -gz=zlib
837KBUILD_AFLAGS += -gz=zlib
838KBUILD_LDFLAGS += --compress-debug-sections=zlib
839endif
840
841KBUILD_CFLAGS += $(DEBUG_CFLAGS)
842export DEBUG_CFLAGS
843
844ifdef CONFIG_FUNCTION_TRACER
845ifdef CONFIG_FTRACE_MCOUNT_RECORD
846 # gcc 5 supports generating the mcount tables directly
847 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
848 CC_FLAGS_FTRACE += -mrecord-mcount
849 export CC_USING_RECORD_MCOUNT := 1
850 endif
851 ifdef CONFIG_HAVE_NOP_MCOUNT
852 ifeq ($(call cc-option-yn, -mnop-mcount),y)
853 CC_FLAGS_FTRACE += -mnop-mcount
854 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
855 endif
856 endif
857endif
858ifdef CONFIG_HAVE_FENTRY
859 ifeq ($(call cc-option-yn, -mfentry),y)
860 CC_FLAGS_FTRACE += -mfentry
861 CC_FLAGS_USING += -DCC_USING_FENTRY
862 endif
863endif
864export CC_FLAGS_FTRACE
865KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
866KBUILD_AFLAGS += $(CC_FLAGS_USING)
867ifdef CONFIG_DYNAMIC_FTRACE
868 ifdef CONFIG_HAVE_C_RECORDMCOUNT
869 BUILD_C_RECORDMCOUNT := y
870 export BUILD_C_RECORDMCOUNT
871 endif
872endif
873endif
874
875# We trigger additional mismatches with less inlining
876ifdef CONFIG_DEBUG_SECTION_MISMATCH
877KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
878endif
879
880ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
881KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
882LDFLAGS_vmlinux += --gc-sections
883endif
884
885ifdef CONFIG_SHADOW_CALL_STACK
886CC_FLAGS_SCS := -fsanitize=shadow-call-stack
887KBUILD_CFLAGS += $(CC_FLAGS_SCS)
888export CC_FLAGS_SCS
889endif
890
891ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
892KBUILD_CFLAGS += -falign-functions=32
893endif
894
895# arch Makefile may override CC so keep this after arch Makefile is included
896NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
897
898# warn about C99 declaration after statement
899KBUILD_CFLAGS += -Wdeclaration-after-statement
900
901# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
902KBUILD_CFLAGS += -Wvla
903
904# disable pointer signed / unsigned warnings in gcc 4.0
905KBUILD_CFLAGS += -Wno-pointer-sign
906
907# disable stringop warnings in gcc 8+
908KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
909
910# We'll want to enable this eventually, but it's not going away for 5.7 at least
911KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
912KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
913KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
914
915# Another good warning that we'll want to enable eventually
916KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
917
918# Enabled with W=2, disabled by default as noisy
919KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
920
921# disable invalid "can't wrap" optimizations for signed / pointers
922KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
923
924# clang sets -fmerge-all-constants by default as optimization, but this
925# is non-conforming behavior for C and in fact breaks the kernel, so we
926# need to disable it here generally.
927KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
928
929# for gcc -fno-merge-all-constants disables everything, but it is fine
930# to have actual conforming behavior enabled.
931KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
932
933# Make sure -fstack-check isn't enabled (like gentoo apparently did)
934KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
935
936# conserve stack if available
937KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
938
939# Prohibit date/time macros, which would make the build non-deterministic
940KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
941
942# enforce correct pointer usage
943KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
944
945# Require designated initializers for all marked structures
946KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
947
948# change __FILE__ to the relative path from the srctree
949KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
950
951# ensure -fcf-protection is disabled when using retpoline as it is
952# incompatible with -mindirect-branch=thunk-extern
953ifdef CONFIG_RETPOLINE
954KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
955endif
956
957# include additional Makefiles when needed
958include-y := scripts/Makefile.extrawarn
959include-$(CONFIG_KASAN) += scripts/Makefile.kasan
960include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
961include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
962include-$(CONFIG_KCOV) += scripts/Makefile.kcov
963include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
964
965include $(addprefix $(srctree)/, $(include-y))
966
967# scripts/Makefile.gcc-plugins is intentionally included last.
968# Do not add $(call cc-option,...) below this line. When you build the kernel
969# from the clean source tree, the GCC plugins do not exist at this point.
970
971# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
972KBUILD_CPPFLAGS += $(KCPPFLAGS)
973KBUILD_AFLAGS += $(KAFLAGS)
974KBUILD_CFLAGS += $(KCFLAGS)
975
976KBUILD_LDFLAGS_MODULE += --build-id
977LDFLAGS_vmlinux += --build-id
978
979ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
980LDFLAGS_vmlinux += $(call ld-option, -X,)
981endif
982
983ifeq ($(CONFIG_RELR),y)
984LDFLAGS_vmlinux += --pack-dyn-relocs=relr
985endif
986
987# Align the bit size of userspace programs with the kernel
988KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
989KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
990
991# make the checker run with the right architecture
992CHECKFLAGS += --arch=$(ARCH)
993
994# insure the checker run with the right endianness
995CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
996
997# the checker needs the correct machine size
998CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
999
1000# Default kernel image to build when no specific target is given.
1001# KBUILD_IMAGE may be overruled on the command line or
1002# set in the environment
1003# Also any assignments in arch/$(ARCH)/Makefile take precedence over
1004# this default value
1005export KBUILD_IMAGE ?= vmlinux
1006
1007#
1008# INSTALL_PATH specifies where to place the updated kernel and system map
1009# images. Default is /boot, but you can set it to other values
1010export INSTALL_PATH ?= /boot
1011
1012#
1013# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1014# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1015# an argument if needed. Otherwise it defaults to the kernel install path
1016#
1017export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1018
1019#
1020# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1021# relocations required by build roots. This is not defined in the
1022# makefile but the argument can be passed to make if needed.
1023#
1024
1025MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1026export MODLIB
1027
1028#
1029# INSTALL_MOD_STRIP, if defined, will cause modules to be
1030# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1031# the default option --strip-debug will be used. Otherwise,
1032# INSTALL_MOD_STRIP value will be used as the options to the strip command.
1033
1034ifdef INSTALL_MOD_STRIP
1035ifeq ($(INSTALL_MOD_STRIP),1)
1036mod_strip_cmd = $(STRIP) --strip-debug
1037else
1038mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1039endif # INSTALL_MOD_STRIP=1
1040else
1041mod_strip_cmd = true
1042endif # INSTALL_MOD_STRIP
1043export mod_strip_cmd
1044
1045# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1046# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1047# or CONFIG_MODULE_COMPRESS_XZ.
1048
1049mod_compress_cmd = true
1050ifdef CONFIG_MODULE_COMPRESS
1051 ifdef CONFIG_MODULE_COMPRESS_GZIP
1052 mod_compress_cmd = $(KGZIP) -n -f
1053 endif # CONFIG_MODULE_COMPRESS_GZIP
1054 ifdef CONFIG_MODULE_COMPRESS_XZ
1055 mod_compress_cmd = $(XZ) -f
1056 endif # CONFIG_MODULE_COMPRESS_XZ
1057endif # CONFIG_MODULE_COMPRESS
1058export mod_compress_cmd
1059
1060ifdef CONFIG_MODULE_SIG_ALL
1061$(eval $(call config_filename,MODULE_SIG_KEY))
1062
1063mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1064else
1065mod_sign_cmd = true
1066endif
1067export mod_sign_cmd
1068
1069HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1070
1071has_libelf = $(call try-run,\
1072 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1073
1074ifdef CONFIG_STACK_VALIDATION
1075 ifeq ($(has_libelf),1)
1076 objtool_target := tools/objtool FORCE
1077 else
1078 SKIP_STACK_VALIDATION := 1
1079 export SKIP_STACK_VALIDATION
1080 endif
1081endif
1082
1083ifdef CONFIG_DEBUG_INFO_BTF
1084 ifeq ($(has_libelf),1)
1085 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1086 else
1087 ERROR_RESOLVE_BTFIDS := 1
1088 endif
1089endif
1090
1091PHONY += prepare0
1092
1093export MODORDER := $(extmod-prefix)modules.order
1094export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1095
1096ifeq ($(KBUILD_EXTMOD),)
1097core-y += kernel certs mm fs ipc security crypto block
1098
1099vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1100 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1101 $(libs-y) $(libs-m)))
1102
1103vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1104 $(patsubst %/,%,$(filter %/, $(core-) \
1105 $(drivers-) $(libs-))))
1106
1107subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1108 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1109 $(drivers-y) $(drivers-m)))
1110
1111build-dirs := $(vmlinux-dirs)
1112clean-dirs := $(vmlinux-alldirs)
1113
1114# Externally visible symbols (used by link-vmlinux.sh)
1115KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1116KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1117ifdef CONFIG_MODULES
1118KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1119KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1120else
1121KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1122endif
1123KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1124
1125export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1126export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1127# used by scripts/Makefile.package
1128export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1129
1130vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1131
1132# Recurse until adjust_autoksyms.sh is satisfied
1133PHONY += autoksyms_recursive
1134ifdef CONFIG_TRIM_UNUSED_KSYMS
1135# For the kernel to actually contain only the needed exported symbols,
1136# we have to build modules as well to determine what those symbols are.
1137# (this can be evaluated only once include/config/auto.conf has been included)
1138KBUILD_MODULES := 1
1139
1140autoksyms_recursive: descend modules.order
1141 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1142 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1143endif
1144
1145autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1146
1147quiet_cmd_autoksyms_h = GEN $@
1148 cmd_autoksyms_h = mkdir -p $(dir $@); \
1149 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1150
1151$(autoksyms_h):
1152 $(call cmd,autoksyms_h)
1153
1154ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1155
1156# Final link of vmlinux with optional arch pass after final link
1157cmd_link-vmlinux = \
1158 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1159 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1160
1161vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1162 +$(call if_changed,link-vmlinux)
1163
1164targets := vmlinux
1165
1166# The actual objects are generated when descending,
1167# make sure no implicit rule kicks in
1168$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1169
1170filechk_kernel.release = \
1171 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1172
1173# Store (new) KERNELRELEASE string in include/config/kernel.release
1174include/config/kernel.release: FORCE
1175 $(call filechk,kernel.release)
1176
1177# Additional helpers built in scripts
1178# Carefully list dependencies so we do not try to build scripts twice
1179# in parallel
1180PHONY += scripts
1181scripts: scripts_basic scripts_dtc
1182 $(Q)$(MAKE) $(build)=$(@)
1183
1184# Things we need to do before we recursively start building the kernel
1185# or the modules are listed in "prepare".
1186# A multi level approach is used. prepareN is processed before prepareN-1.
1187# archprepare is used in arch Makefiles and when processed asm symlink,
1188# version.h and scripts_basic is processed / created.
1189
1190PHONY += prepare archprepare
1191
1192archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1193 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1194 include/generated/autoconf.h
1195
1196prepare0: archprepare
1197 $(Q)$(MAKE) $(build)=scripts/mod
1198 $(Q)$(MAKE) $(build)=.
1199
1200# All the preparing..
1201prepare: prepare0 prepare-objtool prepare-resolve_btfids
1202
1203# Support for using generic headers in asm-generic
1204asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1205
1206PHONY += asm-generic uapi-asm-generic
1207asm-generic: uapi-asm-generic
1208 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1209 generic=include/asm-generic
1210uapi-asm-generic:
1211 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1212 generic=include/uapi/asm-generic
1213
1214PHONY += prepare-objtool prepare-resolve_btfids
1215prepare-objtool: $(objtool_target)
1216ifeq ($(SKIP_STACK_VALIDATION),1)
1217ifdef CONFIG_UNWINDER_ORC
1218 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1219 @false
1220else
1221 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1222endif
1223endif
1224
1225prepare-resolve_btfids: $(resolve_btfids_target)
1226ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1227 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1228 @false
1229endif
1230# Generate some files
1231# ---------------------------------------------------------------------------
1232
1233# KERNELRELEASE can change from a few different places, meaning version.h
1234# needs to be updated, so this check is forced on all builds
1235
1236uts_len := 64
1237define filechk_utsrelease.h
1238 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1239 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1240 exit 1; \
1241 fi; \
1242 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1243endef
1244
1245define filechk_version.h
1246 echo \#define LINUX_VERSION_CODE $(shell \
1247 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1248 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1249endef
1250
1251$(version_h): FORCE
1252 $(call filechk,version.h)
1253 $(Q)rm -f $(old_version_h)
1254
1255include/generated/utsrelease.h: include/config/kernel.release FORCE
1256 $(call filechk,utsrelease.h)
1257
1258PHONY += headerdep
1259headerdep:
1260 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1261 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1262
1263# ---------------------------------------------------------------------------
1264# Kernel headers
1265
1266#Default location for installed headers
1267export INSTALL_HDR_PATH = $(objtree)/usr
1268
1269quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1270 cmd_headers_install = \
1271 mkdir -p $(INSTALL_HDR_PATH); \
1272 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1273 usr/include $(INSTALL_HDR_PATH)
1274
1275PHONY += headers_install
1276headers_install: headers
1277 $(call cmd,headers_install)
1278
1279PHONY += archheaders archscripts
1280
1281hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1282
1283PHONY += headers
1284headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1285 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1286 $(error Headers not exportable for the $(SRCARCH) architecture))
1287 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1288 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1289
1290# Deprecated. It is no-op now.
1291PHONY += headers_check
1292headers_check:
1293 @:
1294
1295ifdef CONFIG_HEADERS_INSTALL
1296prepare: headers
1297endif
1298
1299PHONY += scripts_unifdef
1300scripts_unifdef: scripts_basic
1301 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1302
1303# ---------------------------------------------------------------------------
1304# Kernel selftest
1305
1306PHONY += kselftest
1307kselftest:
1308 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1309
1310kselftest-%: FORCE
1311 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1312
1313PHONY += kselftest-merge
1314kselftest-merge:
1315 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1316 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1317 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1318 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1319
1320# ---------------------------------------------------------------------------
1321# Devicetree files
1322
1323ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1324dtstree := arch/$(SRCARCH)/boot/dts
1325endif
1326
1327ifneq ($(dtstree),)
1328
1329%.dtb: include/config/kernel.release scripts_dtc
1330 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1331
1332PHONY += dtbs dtbs_install dtbs_check
1333dtbs: include/config/kernel.release scripts_dtc
1334 $(Q)$(MAKE) $(build)=$(dtstree)
1335
1336ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1337export CHECK_DTBS=y
1338dtbs: dt_binding_check
1339endif
1340
1341dtbs_check: dtbs
1342
1343dtbs_install:
1344 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1345
1346ifdef CONFIG_OF_EARLY_FLATTREE
1347all: dtbs
1348endif
1349
1350endif
1351
1352PHONY += scripts_dtc
1353scripts_dtc: scripts_basic
1354 $(Q)$(MAKE) $(build)=scripts/dtc
1355
1356ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1357export CHECK_DT_BINDING=y
1358endif
1359
1360PHONY += dt_binding_check
1361dt_binding_check: scripts_dtc
1362 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1363
1364# ---------------------------------------------------------------------------
1365# Modules
1366
1367ifdef CONFIG_MODULES
1368
1369# By default, build modules as well
1370
1371all: modules
1372
1373# When we're building modules with modversions, we need to consider
1374# the built-in objects during the descend as well, in order to
1375# make sure the checksums are up to date before we record them.
1376ifdef CONFIG_MODVERSIONS
1377 KBUILD_BUILTIN := 1
1378endif
1379
1380# Build modules
1381#
1382# A module can be listed more than once in obj-m resulting in
1383# duplicate lines in modules.order files. Those are removed
1384# using awk while concatenating to the final file.
1385
1386PHONY += modules
1387modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
1388 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1389
1390PHONY += modules_check
1391modules_check: modules.order
1392 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1393
1394cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1395
1396modules.order: $(subdir-modorder) FORCE
1397 $(call if_changed,modules_order)
1398
1399targets += modules.order
1400
1401# Target to prepare building external modules
1402PHONY += modules_prepare
1403modules_prepare: prepare
1404
1405# Target to install modules
1406PHONY += modules_install
1407modules_install: _modinst_ _modinst_post
1408
1409PHONY += _modinst_
1410_modinst_:
1411 @rm -rf $(MODLIB)/kernel
1412 @rm -f $(MODLIB)/source
1413 @mkdir -p $(MODLIB)/kernel
1414 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1415 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1416 rm -f $(MODLIB)/build ; \
1417 ln -s $(CURDIR) $(MODLIB)/build ; \
1418 fi
1419 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1420 @cp -f modules.builtin $(MODLIB)/
1421 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1422 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1423
1424# This depmod is only for convenience to give the initial
1425# boot a modules.dep even before / is mounted read-write. However the
1426# boot script depmod is the master version.
1427PHONY += _modinst_post
1428_modinst_post: _modinst_
1429 $(call cmd,depmod)
1430
1431ifeq ($(CONFIG_MODULE_SIG), y)
1432PHONY += modules_sign
1433modules_sign:
1434 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1435endif
1436
1437else # CONFIG_MODULES
1438
1439# Modules not configured
1440# ---------------------------------------------------------------------------
1441
1442PHONY += modules modules_install
1443modules modules_install:
1444 @echo >&2
1445 @echo >&2 "The present kernel configuration has modules disabled."
1446 @echo >&2 "Type 'make config' and enable loadable module support."
1447 @echo >&2 "Then build a kernel with module support enabled."
1448 @echo >&2
1449 @exit 1
1450
1451endif # CONFIG_MODULES
1452
1453###
1454# Cleaning is done on three levels.
1455# make clean Delete most generated files
1456# Leave enough to build external modules
1457# make mrproper Delete the current configuration, and all generated files
1458# make distclean Remove editor backup files, patch leftover files and the like
1459
1460# Directories & files removed with 'make clean'
1461CLEAN_FILES += include/ksym vmlinux.symvers \
1462 modules.builtin modules.builtin.modinfo modules.nsdeps
1463
1464# Directories & files removed with 'make mrproper'
1465MRPROPER_FILES += include/config include/generated \
1466 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1467 debian snap tar-install \
1468 .config .config.old .version \
1469 Module.symvers \
1470 signing_key.pem signing_key.priv signing_key.x509 \
1471 x509.genkey extra_certificates signing_key.x509.keyid \
1472 signing_key.x509.signer vmlinux-gdb.py \
1473 *.spec
1474
1475# Directories & files removed with 'make distclean'
1476DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1477
1478# clean - Delete most, but leave enough to build external modules
1479#
1480clean: rm-files := $(CLEAN_FILES)
1481
1482PHONY += archclean vmlinuxclean
1483
1484vmlinuxclean:
1485 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1486 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1487
1488clean: archclean vmlinuxclean
1489
1490# mrproper - Delete all generated files, including .config
1491#
1492mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1493mrproper-dirs := $(addprefix _mrproper_,scripts)
1494
1495PHONY += $(mrproper-dirs) mrproper
1496$(mrproper-dirs):
1497 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1498
1499mrproper: clean $(mrproper-dirs)
1500 $(call cmd,rmfiles)
1501
1502# distclean
1503#
1504distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1505
1506PHONY += distclean
1507
1508distclean: mrproper
1509 $(call cmd,rmfiles)
1510 @find $(srctree) $(RCS_FIND_IGNORE) \
1511 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1512 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1513 -o -name 'core' \) \
1514 -type f -print | xargs rm -f
1515
1516
1517# Packaging of the kernel to various formats
1518# ---------------------------------------------------------------------------
1519
1520%src-pkg: FORCE
1521 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1522%pkg: include/config/kernel.release FORCE
1523 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1524
1525# Brief documentation of the typical targets used
1526# ---------------------------------------------------------------------------
1527
1528boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1529boards := $(sort $(notdir $(boards)))
1530board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1531board-dirs := $(sort $(notdir $(board-dirs:/=)))
1532
1533PHONY += help
1534help:
1535 @echo 'Cleaning targets:'
1536 @echo ' clean - Remove most generated files but keep the config and'
1537 @echo ' enough build support to build external modules'
1538 @echo ' mrproper - Remove all generated files + config + various backup files'
1539 @echo ' distclean - mrproper + remove editor backup and patch files'
1540 @echo ''
1541 @echo 'Configuration targets:'
1542 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1543 @echo ''
1544 @echo 'Other generic targets:'
1545 @echo ' all - Build all targets marked with [*]'
1546 @echo '* vmlinux - Build the bare kernel'
1547 @echo '* modules - Build all modules'
1548 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1549 @echo ' dir/ - Build all files in dir and below'
1550 @echo ' dir/file.[ois] - Build specified target only'
1551 @echo ' dir/file.ll - Build the LLVM assembly file'
1552 @echo ' (requires compiler support for LLVM assembly generation)'
1553 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1554 @echo ' (requires a recent binutils and recent build (System.map))'
1555 @echo ' dir/file.ko - Build module including final link'
1556 @echo ' modules_prepare - Set up for building external modules'
1557 @echo ' tags/TAGS - Generate tags file for editors'
1558 @echo ' cscope - Generate cscope index'
1559 @echo ' gtags - Generate GNU GLOBAL index'
1560 @echo ' kernelrelease - Output the release version string (use with make -s)'
1561 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1562 @echo ' image_name - Output the image name (use with make -s)'
1563 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1564 echo ' (default: $(INSTALL_HDR_PATH))'; \
1565 echo ''
1566 @echo 'Static analysers:'
1567 @echo ' checkstack - Generate a list of stack hogs'
1568 @echo ' namespacecheck - Name space analysis on compiled kernel'
1569 @echo ' versioncheck - Sanity check on version.h usage'
1570 @echo ' includecheck - Check for duplicate included header files'
1571 @echo ' export_report - List the usages of all exported symbols'
1572 @echo ' headerdep - Detect inclusion cycles in headers'
1573 @echo ' coccicheck - Check with Coccinelle'
1574 @echo ''
1575 @echo 'Tools:'
1576 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1577 @echo ''
1578 @echo 'Kernel selftest:'
1579 @echo ' kselftest - Build and run kernel selftest'
1580 @echo ' Build, install, and boot kernel before'
1581 @echo ' running kselftest on it'
1582 @echo ' Run as root for full coverage'
1583 @echo ' kselftest-all - Build kernel selftest'
1584 @echo ' kselftest-install - Build and install kernel selftest'
1585 @echo ' kselftest-clean - Remove all generated kselftest files'
1586 @echo ' kselftest-merge - Merge all the config dependencies of'
1587 @echo ' kselftest to existing .config.'
1588 @echo ''
1589 @$(if $(dtstree), \
1590 echo 'Devicetree:'; \
1591 echo '* dtbs - Build device tree blobs for enabled boards'; \
1592 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1593 echo ' dt_binding_check - Validate device tree binding documents'; \
1594 echo ' dtbs_check - Validate device tree source files';\
1595 echo '')
1596
1597 @echo 'Userspace tools targets:'
1598 @echo ' use "make tools/help"'
1599 @echo ' or "cd tools; make help"'
1600 @echo ''
1601 @echo 'Kernel packaging:'
1602 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1603 @echo ''
1604 @echo 'Documentation targets:'
1605 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1606 @echo ''
1607 @echo 'Architecture specific targets ($(SRCARCH)):'
1608 @$(if $(archhelp),$(archhelp),\
1609 echo ' No architecture specific help defined for $(SRCARCH)')
1610 @echo ''
1611 @$(if $(boards), \
1612 $(foreach b, $(boards), \
1613 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1614 echo '')
1615 @$(if $(board-dirs), \
1616 $(foreach b, $(board-dirs), \
1617 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1618 printf " %-16s - Show all of the above\\n" help-boards; \
1619 echo '')
1620
1621 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1622 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1623 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1624 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1625 @echo ' (sparse by default)'
1626 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1627 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1628 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1629 @echo ' 1: warnings which may be relevant and do not occur too often'
1630 @echo ' 2: warnings which occur quite often but may still be relevant'
1631 @echo ' 3: more obscure warnings, can most likely be ignored'
1632 @echo ' Multiple levels can be combined with W=12 or W=123'
1633 @echo ''
1634 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1635 @echo 'For further info see the ./README file'
1636
1637
1638help-board-dirs := $(addprefix help-,$(board-dirs))
1639
1640help-boards: $(help-board-dirs)
1641
1642boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1643
1644$(help-board-dirs): help-%:
1645 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1646 @$(if $(boards-per-dir), \
1647 $(foreach b, $(boards-per-dir), \
1648 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1649 echo '')
1650
1651
1652# Documentation targets
1653# ---------------------------------------------------------------------------
1654DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1655 linkcheckdocs dochelp refcheckdocs
1656PHONY += $(DOC_TARGETS)
1657$(DOC_TARGETS):
1658 $(Q)$(MAKE) $(build)=Documentation $@
1659
1660# Misc
1661# ---------------------------------------------------------------------------
1662
1663PHONY += scripts_gdb
1664scripts_gdb: prepare0
1665 $(Q)$(MAKE) $(build)=scripts/gdb
1666 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1667
1668ifdef CONFIG_GDB_SCRIPTS
1669all: scripts_gdb
1670endif
1671
1672else # KBUILD_EXTMOD
1673
1674###
1675# External module support.
1676# When building external modules the kernel used as basis is considered
1677# read-only, and no consistency checks are made and the make
1678# system is not used on the basis kernel. If updates are required
1679# in the basis kernel ordinary make commands (without M=...) must
1680# be used.
1681#
1682# The following are the only valid targets when building external
1683# modules.
1684# make M=dir clean Delete all automatically generated files
1685# make M=dir modules Make all modules in specified dir
1686# make M=dir Same as 'make M=dir modules'
1687# make M=dir modules_install
1688# Install the modules built in the module directory
1689# Assumes install directory is already created
1690
1691# We are always building modules
1692KBUILD_MODULES := 1
1693
1694build-dirs := $(KBUILD_EXTMOD)
1695PHONY += modules
1696modules: descend
1697 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1698
1699PHONY += modules_install
1700modules_install: _emodinst_ _emodinst_post
1701
1702install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1703PHONY += _emodinst_
1704_emodinst_:
1705 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1706 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1707
1708PHONY += _emodinst_post
1709_emodinst_post: _emodinst_
1710 $(call cmd,depmod)
1711
1712clean-dirs := $(KBUILD_EXTMOD)
1713clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1714
1715PHONY += help
1716help:
1717 @echo ' Building external modules.'
1718 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1719 @echo ''
1720 @echo ' modules - default target, build the module(s)'
1721 @echo ' modules_install - install the module'
1722 @echo ' clean - remove generated files in module directory only'
1723 @echo ''
1724
1725PHONY += prepare
1726endif # KBUILD_EXTMOD
1727
1728# Single targets
1729# ---------------------------------------------------------------------------
1730# To build individual files in subdirectories, you can do like this:
1731#
1732# make foo/bar/baz.s
1733#
1734# The supported suffixes for single-target are listed in 'single-targets'
1735#
1736# To build only under specific subdirectories, you can do like this:
1737#
1738# make foo/bar/baz/
1739
1740ifdef single-build
1741
1742# .ko is special because modpost is needed
1743single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1744single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1745
1746$(single-ko): single_modpost
1747 @:
1748$(single-no-ko): descend
1749 @:
1750
1751ifeq ($(KBUILD_EXTMOD),)
1752# For the single build of in-tree modules, use a temporary file to avoid
1753# the situation of modules_install installing an invalid modules.order.
1754MODORDER := .modules.tmp
1755endif
1756
1757PHONY += single_modpost
1758single_modpost: $(single-no-ko)
1759 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1760 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1761
1762KBUILD_MODULES := 1
1763
1764export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1765
1766# trim unrelated directories
1767build-dirs := $(foreach d, $(build-dirs), \
1768 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1769
1770endif
1771
1772ifndef CONFIG_MODULES
1773KBUILD_MODULES :=
1774endif
1775
1776# Handle descending into subdirectories listed in $(build-dirs)
1777# Preset locale variables to speed up the build process. Limit locale
1778# tweaks to this spot to avoid wrong language settings when running
1779# make menuconfig etc.
1780# Error messages still appears in the original language
1781PHONY += descend $(build-dirs)
1782descend: $(build-dirs)
1783$(build-dirs): prepare
1784 $(Q)$(MAKE) $(build)=$@ \
1785 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1786 need-builtin=1 need-modorder=1
1787
1788clean-dirs := $(addprefix _clean_, $(clean-dirs))
1789PHONY += $(clean-dirs) clean
1790$(clean-dirs):
1791 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1792
1793clean: $(clean-dirs)
1794 $(call cmd,rmfiles)
1795 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1796 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1797 -o -name '*.ko.*' \
1798 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1799 -o -name '*.dwo' -o -name '*.lst' \
1800 -o -name '*.su' -o -name '*.mod' \
1801 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1802 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1803 -o -name '*.asn1.[ch]' \
1804 -o -name '*.symtypes' -o -name 'modules.order' \
1805 -o -name '.tmp_*.o.*' \
1806 -o -name '*.c.[012]*.*' \
1807 -o -name '*.ll' \
1808 -o -name '*.gcno' \) -type f -print | xargs rm -f
1809
1810# Generate tags for editors
1811# ---------------------------------------------------------------------------
1812quiet_cmd_tags = GEN $@
1813 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1814
1815tags TAGS cscope gtags: FORCE
1816 $(call cmd,tags)
1817
1818# Script to generate missing namespace dependencies
1819# ---------------------------------------------------------------------------
1820
1821PHONY += nsdeps
1822nsdeps: export KBUILD_NSDEPS=1
1823nsdeps: modules
1824 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1825
1826# Scripts to check various things for consistency
1827# ---------------------------------------------------------------------------
1828
1829PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1830
1831includecheck:
1832 find $(srctree)/* $(RCS_FIND_IGNORE) \
1833 -name '*.[hcS]' -type f -print | sort \
1834 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1835
1836versioncheck:
1837 find $(srctree)/* $(RCS_FIND_IGNORE) \
1838 -name '*.[hcS]' -type f -print | sort \
1839 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1840
1841coccicheck:
1842 $(Q)$(BASH) $(srctree)/scripts/$@
1843
1844namespacecheck:
1845 $(PERL) $(srctree)/scripts/namespace.pl
1846
1847export_report:
1848 $(PERL) $(srctree)/scripts/export_report.pl
1849
1850PHONY += checkstack kernelrelease kernelversion image_name
1851
1852# UML needs a little special treatment here. It wants to use the host
1853# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1854# else wants $(ARCH), including people doing cross-builds, which means
1855# that $(SUBARCH) doesn't work here.
1856ifeq ($(ARCH), um)
1857CHECKSTACK_ARCH := $(SUBARCH)
1858else
1859CHECKSTACK_ARCH := $(ARCH)
1860endif
1861checkstack:
1862 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1863 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1864
1865kernelrelease:
1866 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1867
1868kernelversion:
1869 @echo $(KERNELVERSION)
1870
1871image_name:
1872 @echo $(KBUILD_IMAGE)
1873
1874# Clear a bunch of variables before executing the submake
1875
1876ifeq ($(quiet),silent_)
1877tools_silent=s
1878endif
1879
1880tools/: FORCE
1881 $(Q)mkdir -p $(objtree)/tools
1882 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1883
1884tools/%: FORCE
1885 $(Q)mkdir -p $(objtree)/tools
1886 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1887
1888quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1889 cmd_rmfiles = rm -rf $(rm-files)
1890
1891# Run depmod only if we have System.map and depmod is executable
1892quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1893 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1894 $(KERNELRELEASE)
1895
1896# read saved command lines for existing targets
1897existing-targets := $(wildcard $(sort $(targets)))
1898
1899-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1900
1901endif # config-build
1902endif # mixed-build
1903endif # need-sub-make
1904
1905PHONY += FORCE
1906FORCE:
1907
1908# Declare the contents of the PHONY variable as phony. We keep that
1909# information in a variable so we can use it in if_changed and friends.
1910.PHONY: $(PHONY)