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