xref: /openbmc/linux/Makefile (revision 36d1368d)
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 8
4SUBLEVEL = 0
5EXTRAVERSION = -rc6
6NAME = Kleptomaniac Octopus
7
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
14$(if $(filter __%, $(MAKECMDGOALS)), \
15	$(error targets prefixed with '__' are only for internal use))
16
17# That's our default target when none is given on the command line
18PHONY := __all
19__all:
20
21# We are using a recursive build, so we need to do a little thinking
22# to get the ordering right.
23#
24# Most importantly: sub-Makefiles should only ever modify files in
25# their own directory. If in some directory we have a dependency on
26# a file in another dir (which doesn't happen often, but it's often
27# unavoidable when linking the built-in.a targets which finally
28# turn into vmlinux), we will call a sub make in that other dir, and
29# after that we are sure that everything which is in that other dir
30# is now up to date.
31#
32# The only cases where we need to modify files which have global
33# effects are thus separated out and done before the recursive
34# descending is started. They are now explicitly listed as the
35# prepare rule.
36
37ifneq ($(sub_make_done),1)
38
39# Do not use make's built-in rules and variables
40# (this increases performance and avoids hard-to-debug behaviour)
41MAKEFLAGS += -rR
42
43# Avoid funny character set dependencies
44unexport LC_ALL
45LC_COLLATE=C
46LC_NUMERIC=C
47export LC_COLLATE LC_NUMERIC
48
49# Avoid interference with shell env settings
50unexport GREP_OPTIONS
51
52# Beautify output
53# ---------------------------------------------------------------------------
54#
55# Normally, we echo the whole command before executing it. By making
56# that echo $($(quiet)$(cmd)), we now have the possibility to set
57# $(quiet) to choose other forms of output instead, e.g.
58#
59#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
61#
62# If $(quiet) is empty, the whole command will be printed.
63# If it is set to "quiet_", only the short version will be printed.
64# If it is set to "silent_", nothing will be printed at all, since
65# the variable $(silent_cmd_cc_o_c) doesn't exist.
66#
67# A simple variant is to prefix commands with $(Q) - that's useful
68# for commands that shall be hidden in non-verbose mode.
69#
70#	$(Q)ln $@ :<
71#
72# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73# If KBUILD_VERBOSE equals 1 then the above command is displayed.
74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
75#
76# To put more focus on warnings, be less verbose as default
77# Use 'make V=1' to see the full commands
78
79ifeq ("$(origin V)", "command line")
80  KBUILD_VERBOSE = $(V)
81endif
82ifndef KBUILD_VERBOSE
83  KBUILD_VERBOSE = 0
84endif
85
86ifeq ($(KBUILD_VERBOSE),1)
87  quiet =
88  Q =
89else
90  quiet=quiet_
91  Q = @
92endif
93
94# If the user is running make -s (silent mode), suppress echoing of
95# commands
96
97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
98  quiet=silent_
99endif
100
101export quiet Q KBUILD_VERBOSE
102
103# Kbuild will save output files in the current working directory.
104# This does not need to match to the root of the kernel source tree.
105#
106# For example, you can do this:
107#
108#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
109#
110# If you want to save output files in a different location, there are
111# two syntaxes to specify it.
112#
113# 1) O=
114# Use "make O=dir/to/store/output/files/"
115#
116# 2) Set KBUILD_OUTPUT
117# Set the environment variable KBUILD_OUTPUT to point to the output directory.
118# export KBUILD_OUTPUT=dir/to/store/output/files/; make
119#
120# The O= assignment takes precedence over the KBUILD_OUTPUT environment
121# variable.
122
123# Do we want to change the working directory?
124ifeq ("$(origin O)", "command line")
125  KBUILD_OUTPUT := $(O)
126endif
127
128ifneq ($(KBUILD_OUTPUT),)
129# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
130# expand a shell special character '~'. We use a somewhat tedious way here.
131abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
132$(if $(abs_objtree),, \
133     $(error failed to create output directory "$(KBUILD_OUTPUT)"))
134
135# $(realpath ...) resolves symlinks
136abs_objtree := $(realpath $(abs_objtree))
137else
138abs_objtree := $(CURDIR)
139endif # ifneq ($(KBUILD_OUTPUT),)
140
141ifeq ($(abs_objtree),$(CURDIR))
142# Suppress "Entering directory ..." unless we are changing the work directory.
143MAKEFLAGS += --no-print-directory
144else
145need-sub-make := 1
146endif
147
148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
149
150ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
151$(error source directory cannot contain spaces or colons)
152endif
153
154ifneq ($(abs_srctree),$(abs_objtree))
155# Look for make include files relative to root of kernel src
156#
157# This does not become effective immediately because MAKEFLAGS is re-parsed
158# once after the Makefile is read. We need to invoke sub-make.
159MAKEFLAGS += --include-dir=$(abs_srctree)
160need-sub-make := 1
161endif
162
163this-makefile := $(lastword $(MAKEFILE_LIST))
164
165ifneq ($(filter 3.%,$(MAKE_VERSION)),)
166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
167# We need to invoke sub-make to avoid implicit rules in the top Makefile.
168need-sub-make := 1
169# Cancel implicit rules for this Makefile.
170$(this-makefile): ;
171endif
172
173export abs_srctree abs_objtree
174export sub_make_done := 1
175
176ifeq ($(need-sub-make),1)
177
178PHONY += $(MAKECMDGOALS) __sub-make
179
180$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
181	@:
182
183# Invoke a second make in the output directory, passing relevant variables
184__sub-make:
185	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
186
187endif # need-sub-make
188endif # sub_make_done
189
190# We process the rest of the Makefile if this is the final invocation of make
191ifeq ($(need-sub-make),)
192
193# Do not print "Entering directory ...",
194# but we want to display it when entering to the output directory
195# so that IDEs/editors are able to understand relative filenames.
196MAKEFLAGS += --no-print-directory
197
198# Call a source code checker (by default, "sparse") as part of the
199# C compilation.
200#
201# Use 'make C=1' to enable checking of only re-compiled files.
202# Use 'make C=2' to enable checking of *all* source files, regardless
203# of whether they are re-compiled or not.
204#
205# See the file "Documentation/dev-tools/sparse.rst" for more details,
206# including where to get the "sparse" utility.
207
208ifeq ("$(origin C)", "command line")
209  KBUILD_CHECKSRC = $(C)
210endif
211ifndef KBUILD_CHECKSRC
212  KBUILD_CHECKSRC = 0
213endif
214
215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
216# directory of external module to build. Setting M= takes precedence.
217ifeq ("$(origin M)", "command line")
218  KBUILD_EXTMOD := $(M)
219endif
220
221$(if $(word 2, $(KBUILD_EXTMOD)), \
222	$(error building multiple external modules is not supported))
223
224export KBUILD_CHECKSRC KBUILD_EXTMOD
225
226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
227
228ifeq ($(abs_srctree),$(abs_objtree))
229        # building in the source tree
230        srctree := .
231	building_out_of_srctree :=
232else
233        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
234                # building in a subdirectory of the source tree
235                srctree := ..
236        else
237                srctree := $(abs_srctree)
238        endif
239	building_out_of_srctree := 1
240endif
241
242ifneq ($(KBUILD_ABS_SRCTREE),)
243srctree := $(abs_srctree)
244endif
245
246objtree		:= .
247VPATH		:= $(srctree)
248
249export building_out_of_srctree srctree objtree VPATH
250
251# To make sure we do not include .config for any of the *config targets
252# catch them early, and hand them over to scripts/kconfig/Makefile
253# It is allowed to specify more targets when calling make, including
254# mixing *config targets and build targets.
255# For example 'make oldconfig all'.
256# Detect when mixed targets is specified, and make a second invocation
257# of make so .config is not included in this case either (for *config).
258
259version_h := include/generated/uapi/linux/version.h
260old_version_h := include/linux/version.h
261
262clean-targets := %clean mrproper cleandocs
263no-dot-config-targets := $(clean-targets) \
264			 cscope gtags TAGS tags help% %docs check% coccicheck \
265			 $(version_h) headers headers_% archheaders archscripts \
266			 %asm-generic kernelversion %src-pkg dt_binding_check \
267			 outputmakefile
268no-sync-config-targets := $(no-dot-config-targets) install %install \
269			   kernelrelease
270single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
271
272config-build	:=
273mixed-build	:=
274need-config	:= 1
275may-sync-config	:= 1
276single-build	:=
277
278ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
279	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
280		need-config :=
281	endif
282endif
283
284ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
285	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
286		may-sync-config :=
287	endif
288endif
289
290ifneq ($(KBUILD_EXTMOD),)
291	may-sync-config :=
292endif
293
294ifeq ($(KBUILD_EXTMOD),)
295        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
296		config-build := 1
297                ifneq ($(words $(MAKECMDGOALS)),1)
298			mixed-build := 1
299                endif
300        endif
301endif
302
303# We cannot build single targets and the others at the same time
304ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
305	single-build := 1
306	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
307		mixed-build := 1
308	endif
309endif
310
311# For "make -j clean all", "make -j mrproper defconfig all", etc.
312ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
313        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
314		mixed-build := 1
315        endif
316endif
317
318# install and modules_install need also be processed one by one
319ifneq ($(filter install,$(MAKECMDGOALS)),)
320        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
321		mixed-build := 1
322        endif
323endif
324
325ifdef mixed-build
326# ===========================================================================
327# We're called with mixed targets (*config and build targets).
328# Handle them one by one.
329
330PHONY += $(MAKECMDGOALS) __build_one_by_one
331
332$(MAKECMDGOALS): __build_one_by_one
333	@:
334
335__build_one_by_one:
336	$(Q)set -e; \
337	for i in $(MAKECMDGOALS); do \
338		$(MAKE) -f $(srctree)/Makefile $$i; \
339	done
340
341else # !mixed-build
342
343include scripts/Kbuild.include
344
345# Read KERNELRELEASE from include/config/kernel.release (if it exists)
346KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
347KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
348export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
349
350include scripts/subarch.include
351
352# Cross compiling and selecting different set of gcc/bin-utils
353# ---------------------------------------------------------------------------
354#
355# When performing cross compilation for other architectures ARCH shall be set
356# to the target architecture. (See arch/* for the possibilities).
357# ARCH can be set during invocation of make:
358# make ARCH=ia64
359# Another way is to have ARCH set in the environment.
360# The default ARCH is the host where make is executed.
361
362# CROSS_COMPILE specify the prefix used for all executables used
363# during compilation. Only gcc and related bin-utils executables
364# are prefixed with $(CROSS_COMPILE).
365# CROSS_COMPILE can be set on the command line
366# make CROSS_COMPILE=ia64-linux-
367# Alternatively CROSS_COMPILE can be set in the environment.
368# Default value for CROSS_COMPILE is not to prefix executables
369# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
370ARCH		?= $(SUBARCH)
371
372# Architecture as present in compile.h
373UTS_MACHINE 	:= $(ARCH)
374SRCARCH 	:= $(ARCH)
375
376# Additional ARCH settings for x86
377ifeq ($(ARCH),i386)
378        SRCARCH := x86
379endif
380ifeq ($(ARCH),x86_64)
381        SRCARCH := x86
382endif
383
384# Additional ARCH settings for sparc
385ifeq ($(ARCH),sparc32)
386       SRCARCH := sparc
387endif
388ifeq ($(ARCH),sparc64)
389       SRCARCH := sparc
390endif
391
392# Additional ARCH settings for sh
393ifeq ($(ARCH),sh64)
394       SRCARCH := sh
395endif
396
397KCONFIG_CONFIG	?= .config
398export KCONFIG_CONFIG
399
400# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
401export KBUILD_DEFCONFIG := defconfig
402
403# SHELL used by kbuild
404CONFIG_SHELL := sh
405
406HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
407HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
408HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
409
410ifneq ($(LLVM),)
411HOSTCC	= clang
412HOSTCXX	= clang++
413else
414HOSTCC	= gcc
415HOSTCXX	= g++
416endif
417
418export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
419			      -O2 -fomit-frame-pointer -std=gnu89
420export KBUILD_USERLDFLAGS :=
421
422KBUILD_HOSTCFLAGS   := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
423KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
424KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
425KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
426
427# Make variables (CC, etc...)
428CPP		= $(CC) -E
429ifneq ($(LLVM),)
430CC		= clang
431LD		= ld.lld
432AR		= llvm-ar
433NM		= llvm-nm
434OBJCOPY		= llvm-objcopy
435OBJDUMP		= llvm-objdump
436READELF		= llvm-readelf
437OBJSIZE		= llvm-size
438STRIP		= llvm-strip
439else
440CC		= $(CROSS_COMPILE)gcc
441LD		= $(CROSS_COMPILE)ld
442AR		= $(CROSS_COMPILE)ar
443NM		= $(CROSS_COMPILE)nm
444OBJCOPY		= $(CROSS_COMPILE)objcopy
445OBJDUMP		= $(CROSS_COMPILE)objdump
446READELF		= $(CROSS_COMPILE)readelf
447OBJSIZE		= $(CROSS_COMPILE)size
448STRIP		= $(CROSS_COMPILE)strip
449endif
450PAHOLE		= pahole
451LEX		= flex
452YACC		= bison
453AWK		= awk
454INSTALLKERNEL  := installkernel
455DEPMOD		= /sbin/depmod
456PERL		= perl
457PYTHON		= python
458PYTHON3		= python3
459CHECK		= sparse
460BASH		= bash
461KGZIP		= gzip
462KBZIP2		= bzip2
463KLZOP		= lzop
464LZMA		= lzma
465LZ4		= lz4c
466XZ		= xz
467
468CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
469		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
470NOSTDINC_FLAGS :=
471CFLAGS_MODULE   =
472AFLAGS_MODULE   =
473LDFLAGS_MODULE  =
474CFLAGS_KERNEL	=
475AFLAGS_KERNEL	=
476LDFLAGS_vmlinux =
477
478# Use USERINCLUDE when you must reference the UAPI directories only.
479USERINCLUDE    := \
480		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
481		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
482		-I$(srctree)/include/uapi \
483		-I$(objtree)/include/generated/uapi \
484                -include $(srctree)/include/linux/kconfig.h
485
486# Use LINUXINCLUDE when you must reference the include/ directory.
487# Needed to be compatible with the O= option
488LINUXINCLUDE    := \
489		-I$(srctree)/arch/$(SRCARCH)/include \
490		-I$(objtree)/arch/$(SRCARCH)/include/generated \
491		$(if $(building_out_of_srctree),-I$(srctree)/include) \
492		-I$(objtree)/include \
493		$(USERINCLUDE)
494
495KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
496KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
497		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
498		   -Werror=implicit-function-declaration -Werror=implicit-int \
499		   -Wno-format-security \
500		   -std=gnu89
501KBUILD_CPPFLAGS := -D__KERNEL__
502KBUILD_AFLAGS_KERNEL :=
503KBUILD_CFLAGS_KERNEL :=
504KBUILD_AFLAGS_MODULE  := -DMODULE
505KBUILD_CFLAGS_MODULE  := -DMODULE
506KBUILD_LDFLAGS_MODULE :=
507export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
508KBUILD_LDFLAGS :=
509GCC_PLUGINS_CFLAGS :=
510CLANG_FLAGS :=
511
512export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
513export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
514export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
515export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ
516export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
517
518export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
519export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
520export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN
521export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
522export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
523export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
524
525# Files to ignore in find ... statements
526
527export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
528			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
529			  -prune -o
530export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
531			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
532
533# ===========================================================================
534# Rules shared between *config targets and build targets
535
536# Basic helpers built in scripts/basic/
537PHONY += scripts_basic
538scripts_basic:
539	$(Q)$(MAKE) $(build)=scripts/basic
540	$(Q)rm -f .tmp_quiet_recordmcount
541
542PHONY += outputmakefile
543# Before starting out-of-tree build, make sure the source tree is clean.
544# outputmakefile generates a Makefile in the output directory, if using a
545# separate output directory. This allows convenient use of make in the
546# output directory.
547# At the same time when output Makefile generated, generate .gitignore to
548# ignore whole output directory
549outputmakefile:
550ifdef building_out_of_srctree
551	$(Q)if [ -f $(srctree)/.config -o \
552		 -d $(srctree)/include/config -o \
553		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
554		echo >&2 "***"; \
555		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
556		echo >&2 "*** in $(abs_srctree)";\
557		echo >&2 "***"; \
558		false; \
559	fi
560	$(Q)ln -fsn $(srctree) source
561	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
562	$(Q)test -e .gitignore || \
563	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
564endif
565
566ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
567ifneq ($(CROSS_COMPILE),)
568CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
569GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
570CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
571GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
572endif
573ifneq ($(GCC_TOOLCHAIN),)
574CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
575endif
576ifneq ($(LLVM_IAS),1)
577CLANG_FLAGS	+= -no-integrated-as
578endif
579CLANG_FLAGS	+= -Werror=unknown-warning-option
580KBUILD_CFLAGS	+= $(CLANG_FLAGS)
581KBUILD_AFLAGS	+= $(CLANG_FLAGS)
582export CLANG_FLAGS
583endif
584
585# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
586# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
587# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
588# and from include/config/auto.conf.cmd to detect the compiler upgrade.
589CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
590
591ifdef config-build
592# ===========================================================================
593# *config targets only - make sure prerequisites are updated, and descend
594# in scripts/kconfig to make the *config target
595
596# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
597# KBUILD_DEFCONFIG may point out an alternative default configuration
598# used for 'make defconfig'
599include arch/$(SRCARCH)/Makefile
600export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
601
602config: outputmakefile scripts_basic FORCE
603	$(Q)$(MAKE) $(build)=scripts/kconfig $@
604
605%config: outputmakefile scripts_basic FORCE
606	$(Q)$(MAKE) $(build)=scripts/kconfig $@
607
608else #!config-build
609# ===========================================================================
610# Build targets only - this includes vmlinux, arch specific targets, clean
611# targets and others. In general all targets except *config targets.
612
613# If building an external module we do not care about the all: rule
614# but instead __all depend on modules
615PHONY += all
616ifeq ($(KBUILD_EXTMOD),)
617__all: all
618else
619__all: modules
620endif
621
622# Decide whether to build built-in, modular, or both.
623# Normally, just do built-in.
624
625KBUILD_MODULES :=
626KBUILD_BUILTIN := 1
627
628# If we have only "make modules", don't compile built-in objects.
629ifeq ($(MAKECMDGOALS),modules)
630  KBUILD_BUILTIN :=
631endif
632
633# If we have "make <whatever> modules", compile modules
634# in addition to whatever we do anyway.
635# Just "make" or "make all" shall build modules as well
636
637ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),)
638  KBUILD_MODULES := 1
639endif
640
641ifeq ($(MAKECMDGOALS),)
642  KBUILD_MODULES := 1
643endif
644
645export KBUILD_MODULES KBUILD_BUILTIN
646
647ifdef need-config
648include include/config/auto.conf
649endif
650
651ifeq ($(KBUILD_EXTMOD),)
652# Objects we will link into vmlinux / subdirs we need to visit
653core-y		:= init/ usr/
654drivers-y	:= drivers/ sound/
655drivers-$(CONFIG_SAMPLES) += samples/
656drivers-y	+= net/ virt/
657libs-y		:= lib/
658endif # KBUILD_EXTMOD
659
660# The all: target is the default when no target is given on the
661# command line.
662# This allow a user to issue only 'make' to build a kernel including modules
663# Defaults to vmlinux, but the arch makefile usually adds further targets
664all: vmlinux
665
666CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
667	$(call cc-option,-fno-tree-loop-im) \
668	$(call cc-disable-warning,maybe-uninitialized,)
669export CFLAGS_GCOV
670
671# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
672ifdef CONFIG_FUNCTION_TRACER
673  CC_FLAGS_FTRACE := -pg
674endif
675
676RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
677RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
678RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
679RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
680RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
681RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
682export RETPOLINE_CFLAGS
683export RETPOLINE_VDSO_CFLAGS
684
685include arch/$(SRCARCH)/Makefile
686
687ifdef need-config
688ifdef may-sync-config
689# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
690# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
691# because some architectures define CROSS_COMPILE there.
692include include/config/auto.conf.cmd
693
694$(KCONFIG_CONFIG):
695	@echo >&2 '***'
696	@echo >&2 '*** Configuration file "$@" not found!'
697	@echo >&2 '***'
698	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
699	@echo >&2 '*** "make menuconfig" or "make xconfig").'
700	@echo >&2 '***'
701	@/bin/false
702
703# The actual configuration files used during the build are stored in
704# include/generated/ and include/config/. Update them if .config is newer than
705# include/config/auto.conf (which mirrors .config).
706#
707# This exploits the 'multi-target pattern rule' trick.
708# The syncconfig should be executed only once to make all the targets.
709# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
710%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
711	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
712else # !may-sync-config
713# External modules and some install targets need include/generated/autoconf.h
714# and include/config/auto.conf but do not care if they are up-to-date.
715# Use auto.conf to trigger the test
716PHONY += include/config/auto.conf
717
718include/config/auto.conf:
719	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
720	echo >&2;							\
721	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
722	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
723	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
724	echo >&2 ;							\
725	/bin/false)
726
727endif # may-sync-config
728endif # need-config
729
730KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
731KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
732KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
733KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
734KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
735
736ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
737KBUILD_CFLAGS += -O2
738else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
739KBUILD_CFLAGS += -O3
740else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
741KBUILD_CFLAGS += -Os
742endif
743
744# Tell gcc to never replace conditional load with a non-conditional one
745KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
746KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
747
748include scripts/Makefile.kcov
749include scripts/Makefile.gcc-plugins
750
751ifdef CONFIG_READABLE_ASM
752# Disable optimizations that make assembler listings hard to read.
753# reorder blocks reorders the control in the function
754# ipa clone creates specialized cloned functions
755# partial inlining inlines only parts of functions
756KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
757                 $(call cc-option,-fno-ipa-cp-clone,) \
758                 $(call cc-option,-fno-partial-inlining)
759endif
760
761ifneq ($(CONFIG_FRAME_WARN),0)
762KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
763endif
764
765stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
766stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
767stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
768
769KBUILD_CFLAGS += $(stackp-flags-y)
770
771ifdef CONFIG_CC_IS_CLANG
772KBUILD_CPPFLAGS += -Qunused-arguments
773KBUILD_CFLAGS += -Wno-format-invalid-specifier
774KBUILD_CFLAGS += -Wno-gnu
775# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
776# source of a reference will be _MergedGlobals and not on of the whitelisted names.
777# See modpost pattern 2
778KBUILD_CFLAGS += -mno-global-merge
779else
780
781# These warnings generated too much noise in a regular build.
782# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
783KBUILD_CFLAGS += -Wno-unused-but-set-variable
784
785# Warn about unmarked fall-throughs in switch statement.
786# Disabled for clang while comment to attribute conversion happens and
787# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
788KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
789endif
790
791KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
792ifdef CONFIG_FRAME_POINTER
793KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
794else
795# Some targets (ARM with Thumb2, for example), can't be built with frame
796# pointers.  For those, we don't have FUNCTION_TRACER automatically
797# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
798# incompatible with -fomit-frame-pointer with current GCC, so we don't use
799# -fomit-frame-pointer with FUNCTION_TRACER.
800ifndef CONFIG_FUNCTION_TRACER
801KBUILD_CFLAGS	+= -fomit-frame-pointer
802endif
803endif
804
805# Initialize all stack variables with a pattern, if desired.
806ifdef CONFIG_INIT_STACK_ALL
807KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
808endif
809
810DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
811
812ifdef CONFIG_DEBUG_INFO
813ifdef CONFIG_DEBUG_INFO_SPLIT
814DEBUG_CFLAGS	+= -gsplit-dwarf
815else
816DEBUG_CFLAGS	+= -g
817endif
818KBUILD_AFLAGS	+= -Wa,-gdwarf-2
819endif
820ifdef CONFIG_DEBUG_INFO_DWARF4
821DEBUG_CFLAGS	+= -gdwarf-4
822endif
823
824ifdef CONFIG_DEBUG_INFO_REDUCED
825DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
826		   $(call cc-option,-fno-var-tracking)
827endif
828
829ifdef CONFIG_DEBUG_INFO_COMPRESSED
830DEBUG_CFLAGS	+= -gz=zlib
831KBUILD_AFLAGS	+= -gz=zlib
832KBUILD_LDFLAGS	+= --compress-debug-sections=zlib
833endif
834
835KBUILD_CFLAGS += $(DEBUG_CFLAGS)
836export DEBUG_CFLAGS
837
838ifdef CONFIG_FUNCTION_TRACER
839ifdef CONFIG_FTRACE_MCOUNT_RECORD
840  # gcc 5 supports generating the mcount tables directly
841  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
842    CC_FLAGS_FTRACE	+= -mrecord-mcount
843    export CC_USING_RECORD_MCOUNT := 1
844  endif
845  ifdef CONFIG_HAVE_NOP_MCOUNT
846    ifeq ($(call cc-option-yn, -mnop-mcount),y)
847      CC_FLAGS_FTRACE	+= -mnop-mcount
848      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
849    endif
850  endif
851endif
852ifdef CONFIG_HAVE_FENTRY
853  ifeq ($(call cc-option-yn, -mfentry),y)
854    CC_FLAGS_FTRACE	+= -mfentry
855    CC_FLAGS_USING	+= -DCC_USING_FENTRY
856  endif
857endif
858export CC_FLAGS_FTRACE
859KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
860KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
861ifdef CONFIG_DYNAMIC_FTRACE
862	ifdef CONFIG_HAVE_C_RECORDMCOUNT
863		BUILD_C_RECORDMCOUNT := y
864		export BUILD_C_RECORDMCOUNT
865	endif
866endif
867endif
868
869# We trigger additional mismatches with less inlining
870ifdef CONFIG_DEBUG_SECTION_MISMATCH
871KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
872endif
873
874ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
875KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
876LDFLAGS_vmlinux += --gc-sections
877endif
878
879ifdef CONFIG_LIVEPATCH
880KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
881endif
882
883ifdef CONFIG_SHADOW_CALL_STACK
884CC_FLAGS_SCS	:= -fsanitize=shadow-call-stack
885KBUILD_CFLAGS	+= $(CC_FLAGS_SCS)
886export CC_FLAGS_SCS
887endif
888
889# arch Makefile may override CC so keep this after arch Makefile is included
890NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
891
892# warn about C99 declaration after statement
893KBUILD_CFLAGS += -Wdeclaration-after-statement
894
895# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
896KBUILD_CFLAGS += -Wvla
897
898# disable pointer signed / unsigned warnings in gcc 4.0
899KBUILD_CFLAGS += -Wno-pointer-sign
900
901# disable stringop warnings in gcc 8+
902KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
903
904# We'll want to enable this eventually, but it's not going away for 5.7 at least
905KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
906KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
907KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
908
909# Another good warning that we'll want to enable eventually
910KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
911
912# Enabled with W=2, disabled by default as noisy
913KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
914
915# disable invalid "can't wrap" optimizations for signed / pointers
916KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
917
918# clang sets -fmerge-all-constants by default as optimization, but this
919# is non-conforming behavior for C and in fact breaks the kernel, so we
920# need to disable it here generally.
921KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)
922
923# for gcc -fno-merge-all-constants disables everything, but it is fine
924# to have actual conforming behavior enabled.
925KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)
926
927# Make sure -fstack-check isn't enabled (like gentoo apparently did)
928KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
929
930# conserve stack if available
931KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
932
933# Prohibit date/time macros, which would make the build non-deterministic
934KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
935
936# enforce correct pointer usage
937KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
938
939# Require designated initializers for all marked structures
940KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
941
942# change __FILE__ to the relative path from the srctree
943KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
944
945# ensure -fcf-protection is disabled when using retpoline as it is
946# incompatible with -mindirect-branch=thunk-extern
947ifdef CONFIG_RETPOLINE
948KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
949endif
950
951include scripts/Makefile.kasan
952include scripts/Makefile.extrawarn
953include scripts/Makefile.ubsan
954include scripts/Makefile.kcsan
955
956# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
957KBUILD_CPPFLAGS += $(KCPPFLAGS)
958KBUILD_AFLAGS   += $(KAFLAGS)
959KBUILD_CFLAGS   += $(KCFLAGS)
960
961KBUILD_LDFLAGS_MODULE += --build-id
962LDFLAGS_vmlinux += --build-id
963
964ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
965LDFLAGS_vmlinux	+= $(call ld-option, -X,)
966endif
967
968ifeq ($(CONFIG_RELR),y)
969LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
970endif
971
972# Align the bit size of userspace programs with the kernel
973KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
974KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
975
976# make the checker run with the right architecture
977CHECKFLAGS += --arch=$(ARCH)
978
979# insure the checker run with the right endianness
980CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
981
982# the checker needs the correct machine size
983CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
984
985# Default kernel image to build when no specific target is given.
986# KBUILD_IMAGE may be overruled on the command line or
987# set in the environment
988# Also any assignments in arch/$(ARCH)/Makefile take precedence over
989# this default value
990export KBUILD_IMAGE ?= vmlinux
991
992#
993# INSTALL_PATH specifies where to place the updated kernel and system map
994# images. Default is /boot, but you can set it to other values
995export	INSTALL_PATH ?= /boot
996
997#
998# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
999# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1000# an argument if needed. Otherwise it defaults to the kernel install path
1001#
1002export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1003
1004#
1005# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1006# relocations required by build roots.  This is not defined in the
1007# makefile but the argument can be passed to make if needed.
1008#
1009
1010MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1011export MODLIB
1012
1013#
1014# INSTALL_MOD_STRIP, if defined, will cause modules to be
1015# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
1016# the default option --strip-debug will be used.  Otherwise,
1017# INSTALL_MOD_STRIP value will be used as the options to the strip command.
1018
1019ifdef INSTALL_MOD_STRIP
1020ifeq ($(INSTALL_MOD_STRIP),1)
1021mod_strip_cmd = $(STRIP) --strip-debug
1022else
1023mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1024endif # INSTALL_MOD_STRIP=1
1025else
1026mod_strip_cmd = true
1027endif # INSTALL_MOD_STRIP
1028export mod_strip_cmd
1029
1030# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1031# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1032# or CONFIG_MODULE_COMPRESS_XZ.
1033
1034mod_compress_cmd = true
1035ifdef CONFIG_MODULE_COMPRESS
1036  ifdef CONFIG_MODULE_COMPRESS_GZIP
1037    mod_compress_cmd = $(KGZIP) -n -f
1038  endif # CONFIG_MODULE_COMPRESS_GZIP
1039  ifdef CONFIG_MODULE_COMPRESS_XZ
1040    mod_compress_cmd = $(XZ) -f
1041  endif # CONFIG_MODULE_COMPRESS_XZ
1042endif # CONFIG_MODULE_COMPRESS
1043export mod_compress_cmd
1044
1045ifdef CONFIG_MODULE_SIG_ALL
1046$(eval $(call config_filename,MODULE_SIG_KEY))
1047
1048mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1049else
1050mod_sign_cmd = true
1051endif
1052export mod_sign_cmd
1053
1054HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1055
1056ifdef CONFIG_STACK_VALIDATION
1057  has_libelf := $(call try-run,\
1058		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1059  ifeq ($(has_libelf),1)
1060    objtool_target := tools/objtool FORCE
1061  else
1062    SKIP_STACK_VALIDATION := 1
1063    export SKIP_STACK_VALIDATION
1064  endif
1065endif
1066
1067PHONY += prepare0
1068
1069export MODORDER := $(extmod-prefix)modules.order
1070export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1071
1072ifeq ($(KBUILD_EXTMOD),)
1073core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1074
1075vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, \
1076		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1077		     $(libs-y) $(libs-m)))
1078
1079vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1080		     $(patsubst %/,%,$(filter %/, $(core-) \
1081			$(drivers-) $(libs-))))
1082
1083subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1084			$(core-y) $(core-m) $(libs-y) $(libs-m) \
1085			$(drivers-y) $(drivers-m)))
1086
1087build-dirs	:= $(vmlinux-dirs)
1088clean-dirs	:= $(vmlinux-alldirs)
1089
1090# Externally visible symbols (used by link-vmlinux.sh)
1091KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1092KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1093ifdef CONFIG_MODULES
1094KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1095KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1096else
1097KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1098endif
1099KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1100
1101export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1102export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1103export LDFLAGS_vmlinux
1104# used by scripts/Makefile.package
1105export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1106
1107vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1108
1109# Recurse until adjust_autoksyms.sh is satisfied
1110PHONY += autoksyms_recursive
1111ifdef CONFIG_TRIM_UNUSED_KSYMS
1112# For the kernel to actually contain only the needed exported symbols,
1113# we have to build modules as well to determine what those symbols are.
1114# (this can be evaluated only once include/config/auto.conf has been included)
1115KBUILD_MODULES := 1
1116
1117autoksyms_recursive: descend modules.order
1118	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1119	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1120endif
1121
1122autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1123
1124quiet_cmd_autoksyms_h = GEN     $@
1125      cmd_autoksyms_h = mkdir -p $(dir $@); \
1126			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1127
1128$(autoksyms_h):
1129	$(call cmd,autoksyms_h)
1130
1131ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1132
1133# Final link of vmlinux with optional arch pass after final link
1134cmd_link-vmlinux =                                                 \
1135	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1136	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1137
1138vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1139	+$(call if_changed,link-vmlinux)
1140
1141targets := vmlinux
1142
1143# The actual objects are generated when descending,
1144# make sure no implicit rule kicks in
1145$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1146
1147filechk_kernel.release = \
1148	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1149
1150# Store (new) KERNELRELEASE string in include/config/kernel.release
1151include/config/kernel.release: FORCE
1152	$(call filechk,kernel.release)
1153
1154# Additional helpers built in scripts/
1155# Carefully list dependencies so we do not try to build scripts twice
1156# in parallel
1157PHONY += scripts
1158scripts: scripts_basic scripts_dtc
1159	$(Q)$(MAKE) $(build)=$(@)
1160
1161# Things we need to do before we recursively start building the kernel
1162# or the modules are listed in "prepare".
1163# A multi level approach is used. prepareN is processed before prepareN-1.
1164# archprepare is used in arch Makefiles and when processed asm symlink,
1165# version.h and scripts_basic is processed / created.
1166
1167PHONY += prepare archprepare
1168
1169archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1170	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1171	include/generated/autoconf.h
1172
1173prepare0: archprepare
1174	$(Q)$(MAKE) $(build)=scripts/mod
1175	$(Q)$(MAKE) $(build)=.
1176
1177# All the preparing..
1178prepare: prepare0 prepare-objtool
1179
1180# Support for using generic headers in asm-generic
1181asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1182
1183PHONY += asm-generic uapi-asm-generic
1184asm-generic: uapi-asm-generic
1185	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1186	generic=include/asm-generic
1187uapi-asm-generic:
1188	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1189	generic=include/uapi/asm-generic
1190
1191PHONY += prepare-objtool
1192prepare-objtool: $(objtool_target)
1193ifeq ($(SKIP_STACK_VALIDATION),1)
1194ifdef CONFIG_UNWINDER_ORC
1195	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1196	@false
1197else
1198	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1199endif
1200endif
1201
1202# Generate some files
1203# ---------------------------------------------------------------------------
1204
1205# KERNELRELEASE can change from a few different places, meaning version.h
1206# needs to be updated, so this check is forced on all builds
1207
1208uts_len := 64
1209define filechk_utsrelease.h
1210	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1211	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1212	  exit 1;                                                         \
1213	fi;                                                               \
1214	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1215endef
1216
1217define filechk_version.h
1218	echo \#define LINUX_VERSION_CODE $(shell                         \
1219	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1220	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1221endef
1222
1223$(version_h): FORCE
1224	$(call filechk,version.h)
1225	$(Q)rm -f $(old_version_h)
1226
1227include/generated/utsrelease.h: include/config/kernel.release FORCE
1228	$(call filechk,utsrelease.h)
1229
1230PHONY += headerdep
1231headerdep:
1232	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1233	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1234
1235# ---------------------------------------------------------------------------
1236# Kernel headers
1237
1238#Default location for installed headers
1239export INSTALL_HDR_PATH = $(objtree)/usr
1240
1241quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1242      cmd_headers_install = \
1243	mkdir -p $(INSTALL_HDR_PATH); \
1244	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1245	usr/include $(INSTALL_HDR_PATH)
1246
1247PHONY += headers_install
1248headers_install: headers
1249	$(call cmd,headers_install)
1250
1251PHONY += archheaders archscripts
1252
1253hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1254
1255PHONY += headers
1256headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1257	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1258	  $(error Headers not exportable for the $(SRCARCH) architecture))
1259	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1260	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1261
1262# Deprecated. It is no-op now.
1263PHONY += headers_check
1264headers_check:
1265	@:
1266
1267ifdef CONFIG_HEADERS_INSTALL
1268prepare: headers
1269endif
1270
1271PHONY += scripts_unifdef
1272scripts_unifdef: scripts_basic
1273	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1274
1275# ---------------------------------------------------------------------------
1276# Kernel selftest
1277
1278PHONY += kselftest
1279kselftest:
1280	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1281
1282kselftest-%: FORCE
1283	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1284
1285PHONY += kselftest-merge
1286kselftest-merge:
1287	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1288	$(Q)find $(srctree)/tools/testing/selftests -name config | \
1289		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1290	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1291
1292# ---------------------------------------------------------------------------
1293# Devicetree files
1294
1295ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1296dtstree := arch/$(SRCARCH)/boot/dts
1297endif
1298
1299ifneq ($(dtstree),)
1300
1301%.dtb: include/config/kernel.release scripts_dtc
1302	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1303
1304PHONY += dtbs dtbs_install dtbs_check
1305dtbs: include/config/kernel.release scripts_dtc
1306	$(Q)$(MAKE) $(build)=$(dtstree)
1307
1308ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1309export CHECK_DTBS=y
1310dtbs: dt_binding_check
1311endif
1312
1313dtbs_check: dtbs
1314
1315dtbs_install:
1316	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1317
1318ifdef CONFIG_OF_EARLY_FLATTREE
1319all: dtbs
1320endif
1321
1322endif
1323
1324PHONY += scripts_dtc
1325scripts_dtc: scripts_basic
1326	$(Q)$(MAKE) $(build)=scripts/dtc
1327
1328ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1329export CHECK_DT_BINDING=y
1330endif
1331
1332PHONY += dt_binding_check
1333dt_binding_check: scripts_dtc
1334	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1335
1336# ---------------------------------------------------------------------------
1337# Modules
1338
1339ifdef CONFIG_MODULES
1340
1341# By default, build modules as well
1342
1343all: modules
1344
1345# When we're building modules with modversions, we need to consider
1346# the built-in objects during the descend as well, in order to
1347# make sure the checksums are up to date before we record them.
1348ifdef CONFIG_MODVERSIONS
1349  KBUILD_BUILTIN := 1
1350endif
1351
1352# Build modules
1353#
1354# A module can be listed more than once in obj-m resulting in
1355# duplicate lines in modules.order files.  Those are removed
1356# using awk while concatenating to the final file.
1357
1358PHONY += modules
1359modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
1360	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1361
1362PHONY += modules_check
1363modules_check: modules.order
1364	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1365
1366cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1367
1368modules.order: $(subdir-modorder) FORCE
1369	$(call if_changed,modules_order)
1370
1371targets += modules.order
1372
1373# Target to prepare building external modules
1374PHONY += modules_prepare
1375modules_prepare: prepare
1376
1377# Target to install modules
1378PHONY += modules_install
1379modules_install: _modinst_ _modinst_post
1380
1381PHONY += _modinst_
1382_modinst_:
1383	@rm -rf $(MODLIB)/kernel
1384	@rm -f $(MODLIB)/source
1385	@mkdir -p $(MODLIB)/kernel
1386	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1387	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1388		rm -f $(MODLIB)/build ; \
1389		ln -s $(CURDIR) $(MODLIB)/build ; \
1390	fi
1391	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1392	@cp -f modules.builtin $(MODLIB)/
1393	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1394	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1395
1396# This depmod is only for convenience to give the initial
1397# boot a modules.dep even before / is mounted read-write.  However the
1398# boot script depmod is the master version.
1399PHONY += _modinst_post
1400_modinst_post: _modinst_
1401	$(call cmd,depmod)
1402
1403ifeq ($(CONFIG_MODULE_SIG), y)
1404PHONY += modules_sign
1405modules_sign:
1406	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1407endif
1408
1409else # CONFIG_MODULES
1410
1411# Modules not configured
1412# ---------------------------------------------------------------------------
1413
1414PHONY += modules modules_install
1415modules modules_install:
1416	@echo >&2
1417	@echo >&2 "The present kernel configuration has modules disabled."
1418	@echo >&2 "Type 'make config' and enable loadable module support."
1419	@echo >&2 "Then build a kernel with module support enabled."
1420	@echo >&2
1421	@exit 1
1422
1423endif # CONFIG_MODULES
1424
1425###
1426# Cleaning is done on three levels.
1427# make clean     Delete most generated files
1428#                Leave enough to build external modules
1429# make mrproper  Delete the current configuration, and all generated files
1430# make distclean Remove editor backup files, patch leftover files and the like
1431
1432# Directories & files removed with 'make clean'
1433CLEAN_FILES += include/ksym vmlinux.symvers \
1434	       modules.builtin modules.builtin.modinfo modules.nsdeps
1435
1436# Directories & files removed with 'make mrproper'
1437MRPROPER_FILES += include/config include/generated          \
1438		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
1439		  debian snap tar-install \
1440		  .config .config.old .version \
1441		  Module.symvers \
1442		  signing_key.pem signing_key.priv signing_key.x509	\
1443		  x509.genkey extra_certificates signing_key.x509.keyid	\
1444		  signing_key.x509.signer vmlinux-gdb.py \
1445		  *.spec
1446
1447# Directories & files removed with 'make distclean'
1448DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1449
1450# clean - Delete most, but leave enough to build external modules
1451#
1452clean: rm-files := $(CLEAN_FILES)
1453
1454PHONY += archclean vmlinuxclean
1455
1456vmlinuxclean:
1457	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1458	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1459
1460clean: archclean vmlinuxclean
1461
1462# mrproper - Delete all generated files, including .config
1463#
1464mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1465mrproper-dirs      := $(addprefix _mrproper_,scripts)
1466
1467PHONY += $(mrproper-dirs) mrproper
1468$(mrproper-dirs):
1469	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1470
1471mrproper: clean $(mrproper-dirs)
1472	$(call cmd,rmfiles)
1473
1474# distclean
1475#
1476distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1477
1478PHONY += distclean
1479
1480distclean: mrproper
1481	$(call cmd,rmfiles)
1482	@find $(srctree) $(RCS_FIND_IGNORE) \
1483		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1484		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1485		-o -name 'core' \) \
1486		-type f -print | xargs rm -f
1487
1488
1489# Packaging of the kernel to various formats
1490# ---------------------------------------------------------------------------
1491
1492%src-pkg: FORCE
1493	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1494%pkg: include/config/kernel.release FORCE
1495	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1496
1497# Brief documentation of the typical targets used
1498# ---------------------------------------------------------------------------
1499
1500boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1501boards := $(sort $(notdir $(boards)))
1502board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1503board-dirs := $(sort $(notdir $(board-dirs:/=)))
1504
1505PHONY += help
1506help:
1507	@echo  'Cleaning targets:'
1508	@echo  '  clean		  - Remove most generated files but keep the config and'
1509	@echo  '                    enough build support to build external modules'
1510	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1511	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1512	@echo  ''
1513	@echo  'Configuration targets:'
1514	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1515	@echo  ''
1516	@echo  'Other generic targets:'
1517	@echo  '  all		  - Build all targets marked with [*]'
1518	@echo  '* vmlinux	  - Build the bare kernel'
1519	@echo  '* modules	  - Build all modules'
1520	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1521	@echo  '  dir/            - Build all files in dir and below'
1522	@echo  '  dir/file.[ois]  - Build specified target only'
1523	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1524	@echo  '                    (requires compiler support for LLVM assembly generation)'
1525	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1526	@echo  '                    (requires a recent binutils and recent build (System.map))'
1527	@echo  '  dir/file.ko     - Build module including final link'
1528	@echo  '  modules_prepare - Set up for building external modules'
1529	@echo  '  tags/TAGS	  - Generate tags file for editors'
1530	@echo  '  cscope	  - Generate cscope index'
1531	@echo  '  gtags           - Generate GNU GLOBAL index'
1532	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1533	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1534	@echo  '  image_name	  - Output the image name (use with make -s)'
1535	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1536	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1537	 echo  ''
1538	@echo  'Static analysers:'
1539	@echo  '  checkstack      - Generate a list of stack hogs'
1540	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1541	@echo  '  versioncheck    - Sanity check on version.h usage'
1542	@echo  '  includecheck    - Check for duplicate included header files'
1543	@echo  '  export_report   - List the usages of all exported symbols'
1544	@echo  '  headerdep       - Detect inclusion cycles in headers'
1545	@echo  '  coccicheck      - Check with Coccinelle'
1546	@echo  ''
1547	@echo  'Tools:'
1548	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1549	@echo  ''
1550	@echo  'Kernel selftest:'
1551	@echo  '  kselftest         - Build and run kernel selftest'
1552	@echo  '                      Build, install, and boot kernel before'
1553	@echo  '                      running kselftest on it'
1554	@echo  '                      Run as root for full coverage'
1555	@echo  '  kselftest-all     - Build kernel selftest'
1556	@echo  '  kselftest-install - Build and install kernel selftest'
1557	@echo  '  kselftest-clean   - Remove all generated kselftest files'
1558	@echo  '  kselftest-merge   - Merge all the config dependencies of'
1559	@echo  '		      kselftest to existing .config.'
1560	@echo  ''
1561	@$(if $(dtstree), \
1562		echo 'Devicetree:'; \
1563		echo '* dtbs             - Build device tree blobs for enabled boards'; \
1564		echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1565		echo '  dt_binding_check - Validate device tree binding documents'; \
1566		echo '  dtbs_check       - Validate device tree source files';\
1567		echo '')
1568
1569	@echo 'Userspace tools targets:'
1570	@echo '  use "make tools/help"'
1571	@echo '  or  "cd tools; make help"'
1572	@echo  ''
1573	@echo  'Kernel packaging:'
1574	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
1575	@echo  ''
1576	@echo  'Documentation targets:'
1577	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1578	@echo  ''
1579	@echo  'Architecture specific targets ($(SRCARCH)):'
1580	@$(if $(archhelp),$(archhelp),\
1581		echo '  No architecture specific help defined for $(SRCARCH)')
1582	@echo  ''
1583	@$(if $(boards), \
1584		$(foreach b, $(boards), \
1585		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1586		echo '')
1587	@$(if $(board-dirs), \
1588		$(foreach b, $(board-dirs), \
1589		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1590		printf "  %-16s - Show all of the above\\n" help-boards; \
1591		echo '')
1592
1593	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1594	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1595	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1596	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1597	@echo  '                       (sparse by default)'
1598	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1599	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1600	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1601	@echo  '		1: warnings which may be relevant and do not occur too often'
1602	@echo  '		2: warnings which occur quite often but may still be relevant'
1603	@echo  '		3: more obscure warnings, can most likely be ignored'
1604	@echo  '		Multiple levels can be combined with W=12 or W=123'
1605	@echo  ''
1606	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1607	@echo  'For further info see the ./README file'
1608
1609
1610help-board-dirs := $(addprefix help-,$(board-dirs))
1611
1612help-boards: $(help-board-dirs)
1613
1614boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1615
1616$(help-board-dirs): help-%:
1617	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1618	@$(if $(boards-per-dir), \
1619		$(foreach b, $(boards-per-dir), \
1620		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1621		echo '')
1622
1623
1624# Documentation targets
1625# ---------------------------------------------------------------------------
1626DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1627	       linkcheckdocs dochelp refcheckdocs
1628PHONY += $(DOC_TARGETS)
1629$(DOC_TARGETS):
1630	$(Q)$(MAKE) $(build)=Documentation $@
1631
1632# Misc
1633# ---------------------------------------------------------------------------
1634
1635PHONY += scripts_gdb
1636scripts_gdb: prepare0
1637	$(Q)$(MAKE) $(build)=scripts/gdb
1638	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1639
1640ifdef CONFIG_GDB_SCRIPTS
1641all: scripts_gdb
1642endif
1643
1644else # KBUILD_EXTMOD
1645
1646###
1647# External module support.
1648# When building external modules the kernel used as basis is considered
1649# read-only, and no consistency checks are made and the make
1650# system is not used on the basis kernel. If updates are required
1651# in the basis kernel ordinary make commands (without M=...) must
1652# be used.
1653#
1654# The following are the only valid targets when building external
1655# modules.
1656# make M=dir clean     Delete all automatically generated files
1657# make M=dir modules   Make all modules in specified dir
1658# make M=dir	       Same as 'make M=dir modules'
1659# make M=dir modules_install
1660#                      Install the modules built in the module directory
1661#                      Assumes install directory is already created
1662
1663# We are always building modules
1664KBUILD_MODULES := 1
1665
1666build-dirs := $(KBUILD_EXTMOD)
1667PHONY += modules
1668modules: descend
1669	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1670
1671PHONY += modules_install
1672modules_install: _emodinst_ _emodinst_post
1673
1674install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1675PHONY += _emodinst_
1676_emodinst_:
1677	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1678	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1679
1680PHONY += _emodinst_post
1681_emodinst_post: _emodinst_
1682	$(call cmd,depmod)
1683
1684clean-dirs := $(KBUILD_EXTMOD)
1685clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1686
1687PHONY += help
1688help:
1689	@echo  '  Building external modules.'
1690	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1691	@echo  ''
1692	@echo  '  modules         - default target, build the module(s)'
1693	@echo  '  modules_install - install the module'
1694	@echo  '  clean           - remove generated files in module directory only'
1695	@echo  ''
1696
1697PHONY += prepare
1698endif # KBUILD_EXTMOD
1699
1700# Single targets
1701# ---------------------------------------------------------------------------
1702# To build individual files in subdirectories, you can do like this:
1703#
1704#   make foo/bar/baz.s
1705#
1706# The supported suffixes for single-target are listed in 'single-targets'
1707#
1708# To build only under specific subdirectories, you can do like this:
1709#
1710#   make foo/bar/baz/
1711
1712ifdef single-build
1713
1714# .ko is special because modpost is needed
1715single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1716single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1717
1718$(single-ko): single_modpost
1719	@:
1720$(single-no-ko): descend
1721	@:
1722
1723ifeq ($(KBUILD_EXTMOD),)
1724# For the single build of in-tree modules, use a temporary file to avoid
1725# the situation of modules_install installing an invalid modules.order.
1726MODORDER := .modules.tmp
1727endif
1728
1729PHONY += single_modpost
1730single_modpost: $(single-no-ko)
1731	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1732	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1733
1734KBUILD_MODULES := 1
1735
1736export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1737
1738# trim unrelated directories
1739build-dirs := $(foreach d, $(build-dirs), \
1740			$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1741
1742endif
1743
1744ifndef CONFIG_MODULES
1745KBUILD_MODULES :=
1746endif
1747
1748# Handle descending into subdirectories listed in $(build-dirs)
1749# Preset locale variables to speed up the build process. Limit locale
1750# tweaks to this spot to avoid wrong language settings when running
1751# make menuconfig etc.
1752# Error messages still appears in the original language
1753PHONY += descend $(build-dirs)
1754descend: $(build-dirs)
1755$(build-dirs): prepare
1756	$(Q)$(MAKE) $(build)=$@ \
1757	single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1758	need-builtin=1 need-modorder=1
1759
1760clean-dirs := $(addprefix _clean_, $(clean-dirs))
1761PHONY += $(clean-dirs) clean
1762$(clean-dirs):
1763	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1764
1765clean: $(clean-dirs)
1766	$(call cmd,rmfiles)
1767	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1768		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1769		-o -name '*.ko.*' \
1770		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1771		-o -name '*.dwo' -o -name '*.lst' \
1772		-o -name '*.su' -o -name '*.mod' \
1773		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1774		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1775		-o -name '*.asn1.[ch]' \
1776		-o -name '*.symtypes' -o -name 'modules.order' \
1777		-o -name '.tmp_*.o.*' \
1778		-o -name '*.c.[012]*.*' \
1779		-o -name '*.ll' \
1780		-o -name '*.gcno' \) -type f -print | xargs rm -f
1781
1782# Generate tags for editors
1783# ---------------------------------------------------------------------------
1784quiet_cmd_tags = GEN     $@
1785      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1786
1787tags TAGS cscope gtags: FORCE
1788	$(call cmd,tags)
1789
1790# Script to generate missing namespace dependencies
1791# ---------------------------------------------------------------------------
1792
1793PHONY += nsdeps
1794nsdeps: export KBUILD_NSDEPS=1
1795nsdeps: modules
1796	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1797
1798# Scripts to check various things for consistency
1799# ---------------------------------------------------------------------------
1800
1801PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1802
1803includecheck:
1804	find $(srctree)/* $(RCS_FIND_IGNORE) \
1805		-name '*.[hcS]' -type f -print | sort \
1806		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1807
1808versioncheck:
1809	find $(srctree)/* $(RCS_FIND_IGNORE) \
1810		-name '*.[hcS]' -type f -print | sort \
1811		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1812
1813coccicheck:
1814	$(Q)$(BASH) $(srctree)/scripts/$@
1815
1816namespacecheck:
1817	$(PERL) $(srctree)/scripts/namespace.pl
1818
1819export_report:
1820	$(PERL) $(srctree)/scripts/export_report.pl
1821
1822PHONY += checkstack kernelrelease kernelversion image_name
1823
1824# UML needs a little special treatment here.  It wants to use the host
1825# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1826# else wants $(ARCH), including people doing cross-builds, which means
1827# that $(SUBARCH) doesn't work here.
1828ifeq ($(ARCH), um)
1829CHECKSTACK_ARCH := $(SUBARCH)
1830else
1831CHECKSTACK_ARCH := $(ARCH)
1832endif
1833checkstack:
1834	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1835	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1836
1837kernelrelease:
1838	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1839
1840kernelversion:
1841	@echo $(KERNELVERSION)
1842
1843image_name:
1844	@echo $(KBUILD_IMAGE)
1845
1846# Clear a bunch of variables before executing the submake
1847
1848ifeq ($(quiet),silent_)
1849tools_silent=s
1850endif
1851
1852tools/: FORCE
1853	$(Q)mkdir -p $(objtree)/tools
1854	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1855
1856tools/%: FORCE
1857	$(Q)mkdir -p $(objtree)/tools
1858	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1859
1860quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1861      cmd_rmfiles = rm -rf $(rm-files)
1862
1863# Run depmod only if we have System.map and depmod is executable
1864quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1865      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1866                   $(KERNELRELEASE)
1867
1868# read saved command lines for existing targets
1869existing-targets := $(wildcard $(sort $(targets)))
1870
1871-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1872
1873endif # config-build
1874endif # mixed-build
1875endif # need-sub-make
1876
1877PHONY += FORCE
1878FORCE:
1879
1880# Declare the contents of the PHONY variable as phony.  We keep that
1881# information in a variable so we can use it in if_changed and friends.
1882.PHONY: $(PHONY)
1883