Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 12
4SUBLEVEL = 0
5EXTRAVERSION = -rc2
6NAME = Frozen Wasteland
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 --%,$(MAKEFLAGS))),)
98 quiet=silent_
99 KBUILD_VERBOSE = 0
100endif
101
102export quiet Q KBUILD_VERBOSE
103
104# Call a source code checker (by default, "sparse") as part of the
105# C compilation.
106#
107# Use 'make C=1' to enable checking of only re-compiled files.
108# Use 'make C=2' to enable checking of *all* source files, regardless
109# of whether they are re-compiled or not.
110#
111# See the file "Documentation/dev-tools/sparse.rst" for more details,
112# including where to get the "sparse" utility.
113
114ifeq ("$(origin C)", "command line")
115 KBUILD_CHECKSRC = $(C)
116endif
117ifndef KBUILD_CHECKSRC
118 KBUILD_CHECKSRC = 0
119endif
120
121export KBUILD_CHECKSRC
122
123# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
124# directory of external module to build. Setting M= takes precedence.
125ifeq ("$(origin M)", "command line")
126 KBUILD_EXTMOD := $(M)
127endif
128
129$(if $(word 2, $(KBUILD_EXTMOD)), \
130 $(error building multiple external modules is not supported))
131
132export KBUILD_EXTMOD
133
134# Kbuild will save output files in the current working directory.
135# This does not need to match to the root of the kernel source tree.
136#
137# For example, you can do this:
138#
139# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
140#
141# If you want to save output files in a different location, there are
142# two syntaxes to specify it.
143#
144# 1) O=
145# Use "make O=dir/to/store/output/files/"
146#
147# 2) Set KBUILD_OUTPUT
148# Set the environment variable KBUILD_OUTPUT to point to the output directory.
149# export KBUILD_OUTPUT=dir/to/store/output/files/; make
150#
151# The O= assignment takes precedence over the KBUILD_OUTPUT environment
152# variable.
153
154# Do we want to change the working directory?
155ifeq ("$(origin O)", "command line")
156 KBUILD_OUTPUT := $(O)
157endif
158
159ifneq ($(KBUILD_OUTPUT),)
160# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
161# expand a shell special character '~'. We use a somewhat tedious way here.
162abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
163$(if $(abs_objtree),, \
164 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
165
166# $(realpath ...) resolves symlinks
167abs_objtree := $(realpath $(abs_objtree))
168else
169abs_objtree := $(CURDIR)
170endif # ifneq ($(KBUILD_OUTPUT),)
171
172ifeq ($(abs_objtree),$(CURDIR))
173# Suppress "Entering directory ..." unless we are changing the work directory.
174MAKEFLAGS += --no-print-directory
175else
176need-sub-make := 1
177endif
178
179this-makefile := $(lastword $(MAKEFILE_LIST))
180abs_srctree := $(realpath $(dir $(this-makefile)))
181
182ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
183$(error source directory cannot contain spaces or colons)
184endif
185
186ifneq ($(abs_srctree),$(abs_objtree))
187# Look for make include files relative to root of kernel src
188#
189# This does not become effective immediately because MAKEFLAGS is re-parsed
190# once after the Makefile is read. We need to invoke sub-make.
191MAKEFLAGS += --include-dir=$(abs_srctree)
192need-sub-make := 1
193endif
194
195ifneq ($(filter 3.%,$(MAKE_VERSION)),)
196# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
197# We need to invoke sub-make to avoid implicit rules in the top Makefile.
198need-sub-make := 1
199# Cancel implicit rules for this Makefile.
200$(this-makefile): ;
201endif
202
203export abs_srctree abs_objtree
204export sub_make_done := 1
205
206ifeq ($(need-sub-make),1)
207
208PHONY += $(MAKECMDGOALS) __sub-make
209
210$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
211 @:
212
213# Invoke a second make in the output directory, passing relevant variables
214__sub-make:
215 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
216
217endif # need-sub-make
218endif # sub_make_done
219
220# We process the rest of the Makefile if this is the final invocation of make
221ifeq ($(need-sub-make),)
222
223# Do not print "Entering directory ...",
224# but we want to display it when entering to the output directory
225# so that IDEs/editors are able to understand relative filenames.
226MAKEFLAGS += --no-print-directory
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
260
261clean-targets := %clean mrproper cleandocs
262no-dot-config-targets := $(clean-targets) \
263 cscope gtags TAGS tags help% %docs check% coccicheck \
264 $(version_h) headers headers_% archheaders archscripts \
265 %asm-generic kernelversion %src-pkg dt_binding_check \
266 outputmakefile
267no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease
268single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
269
270config-build :=
271mixed-build :=
272need-config := 1
273may-sync-config := 1
274single-build :=
275
276ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
277 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
278 need-config :=
279 endif
280endif
281
282ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
283 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
284 may-sync-config :=
285 endif
286endif
287
288ifneq ($(KBUILD_EXTMOD),)
289 may-sync-config :=
290endif
291
292ifeq ($(KBUILD_EXTMOD),)
293 ifneq ($(filter %config,$(MAKECMDGOALS)),)
294 config-build := 1
295 ifneq ($(words $(MAKECMDGOALS)),1)
296 mixed-build := 1
297 endif
298 endif
299endif
300
301# We cannot build single targets and the others at the same time
302ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
303 single-build := 1
304 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
305 mixed-build := 1
306 endif
307endif
308
309# For "make -j clean all", "make -j mrproper defconfig all", etc.
310ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
311 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
312 mixed-build := 1
313 endif
314endif
315
316# install and modules_install need also be processed one by one
317ifneq ($(filter install,$(MAKECMDGOALS)),)
318 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
319 mixed-build := 1
320 endif
321endif
322
323ifdef mixed-build
324# ===========================================================================
325# We're called with mixed targets (*config and build targets).
326# Handle them one by one.
327
328PHONY += $(MAKECMDGOALS) __build_one_by_one
329
330$(MAKECMDGOALS): __build_one_by_one
331 @:
332
333__build_one_by_one:
334 $(Q)set -e; \
335 for i in $(MAKECMDGOALS); do \
336 $(MAKE) -f $(srctree)/Makefile $$i; \
337 done
338
339else # !mixed-build
340
341include scripts/Kbuild.include
342
343# Read KERNELRELEASE from include/config/kernel.release (if it exists)
344KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
345KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
346export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
347
348include scripts/subarch.include
349
350# Cross compiling and selecting different set of gcc/bin-utils
351# ---------------------------------------------------------------------------
352#
353# When performing cross compilation for other architectures ARCH shall be set
354# to the target architecture. (See arch/* for the possibilities).
355# ARCH can be set during invocation of make:
356# make ARCH=ia64
357# Another way is to have ARCH set in the environment.
358# The default ARCH is the host where make is executed.
359
360# CROSS_COMPILE specify the prefix used for all executables used
361# during compilation. Only gcc and related bin-utils executables
362# are prefixed with $(CROSS_COMPILE).
363# CROSS_COMPILE can be set on the command line
364# make CROSS_COMPILE=ia64-linux-
365# Alternatively CROSS_COMPILE can be set in the environment.
366# Default value for CROSS_COMPILE is not to prefix executables
367# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
368ARCH ?= $(SUBARCH)
369
370# Architecture as present in compile.h
371UTS_MACHINE := $(ARCH)
372SRCARCH := $(ARCH)
373
374# Additional ARCH settings for x86
375ifeq ($(ARCH),i386)
376 SRCARCH := x86
377endif
378ifeq ($(ARCH),x86_64)
379 SRCARCH := x86
380endif
381
382# Additional ARCH settings for sparc
383ifeq ($(ARCH),sparc32)
384 SRCARCH := sparc
385endif
386ifeq ($(ARCH),sparc64)
387 SRCARCH := sparc
388endif
389
390# Additional ARCH settings for sh
391ifeq ($(ARCH),sh64)
392 SRCARCH := sh
393endif
394
395KCONFIG_CONFIG ?= .config
396export KCONFIG_CONFIG
397
398# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
399export KBUILD_DEFCONFIG := defconfig
400
401# SHELL used by kbuild
402CONFIG_SHELL := sh
403
404HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
405HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
406HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
407
408ifneq ($(LLVM),)
409HOSTCC = clang
410HOSTCXX = clang++
411else
412HOSTCC = gcc
413HOSTCXX = g++
414endif
415
416export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
417 -O2 -fomit-frame-pointer -std=gnu89
418export KBUILD_USERLDFLAGS :=
419
420KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
421KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
422KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
423KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
424
425# Make variables (CC, etc...)
426CPP = $(CC) -E
427ifneq ($(LLVM),)
428CC = clang
429LD = ld.lld
430AR = llvm-ar
431NM = llvm-nm
432OBJCOPY = llvm-objcopy
433OBJDUMP = llvm-objdump
434READELF = llvm-readelf
435STRIP = llvm-strip
436else
437CC = $(CROSS_COMPILE)gcc
438LD = $(CROSS_COMPILE)ld
439AR = $(CROSS_COMPILE)ar
440NM = $(CROSS_COMPILE)nm
441OBJCOPY = $(CROSS_COMPILE)objcopy
442OBJDUMP = $(CROSS_COMPILE)objdump
443READELF = $(CROSS_COMPILE)readelf
444STRIP = $(CROSS_COMPILE)strip
445endif
446PAHOLE = pahole
447RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
448LEX = flex
449YACC = bison
450AWK = awk
451INSTALLKERNEL := installkernel
452DEPMOD = depmod
453PERL = perl
454PYTHON3 = python3
455CHECK = sparse
456BASH = bash
457KGZIP = gzip
458KBZIP2 = bzip2
459KLZOP = lzop
460LZMA = lzma
461LZ4 = lz4c
462XZ = xz
463ZSTD = zstd
464
465CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
466 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
467NOSTDINC_FLAGS :=
468CFLAGS_MODULE =
469AFLAGS_MODULE =
470LDFLAGS_MODULE =
471CFLAGS_KERNEL =
472AFLAGS_KERNEL =
473LDFLAGS_vmlinux =
474
475# Use USERINCLUDE when you must reference the UAPI directories only.
476USERINCLUDE := \
477 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
478 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
479 -I$(srctree)/include/uapi \
480 -I$(objtree)/include/generated/uapi \
481 -include $(srctree)/include/linux/kconfig.h
482
483# Use LINUXINCLUDE when you must reference the include/ directory.
484# Needed to be compatible with the O= option
485LINUXINCLUDE := \
486 -I$(srctree)/arch/$(SRCARCH)/include \
487 -I$(objtree)/arch/$(SRCARCH)/include/generated \
488 $(if $(building_out_of_srctree),-I$(srctree)/include) \
489 -I$(objtree)/include \
490 $(USERINCLUDE)
491
492KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
493KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
494 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
495 -Werror=implicit-function-declaration -Werror=implicit-int \
496 -Werror=return-type -Wno-format-security \
497 -std=gnu89
498KBUILD_CPPFLAGS := -D__KERNEL__
499KBUILD_AFLAGS_KERNEL :=
500KBUILD_CFLAGS_KERNEL :=
501KBUILD_AFLAGS_MODULE := -DMODULE
502KBUILD_CFLAGS_MODULE := -DMODULE
503KBUILD_LDFLAGS_MODULE :=
504KBUILD_LDFLAGS :=
505CLANG_FLAGS :=
506
507export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
508export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
509export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
510export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
511export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
512
513export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
514export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
515export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
516export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
517export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
518
519# Files to ignore in find ... statements
520
521export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
522 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
523 -prune -o
524export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
525 --exclude CVS --exclude .pc --exclude .hg --exclude .git
526
527# ===========================================================================
528# Rules shared between *config targets and build targets
529
530# Basic helpers built in scripts/basic/
531PHONY += scripts_basic
532scripts_basic:
533 $(Q)$(MAKE) $(build)=scripts/basic
534 $(Q)rm -f .tmp_quiet_recordmcount
535
536PHONY += outputmakefile
537# Before starting out-of-tree build, make sure the source tree is clean.
538# outputmakefile generates a Makefile in the output directory, if using a
539# separate output directory. This allows convenient use of make in the
540# output directory.
541# At the same time when output Makefile generated, generate .gitignore to
542# ignore whole output directory
543outputmakefile:
544ifdef building_out_of_srctree
545 $(Q)if [ -f $(srctree)/.config -o \
546 -d $(srctree)/include/config -o \
547 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
548 echo >&2 "***"; \
549 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
550 echo >&2 "*** in $(abs_srctree)";\
551 echo >&2 "***"; \
552 false; \
553 fi
554 $(Q)ln -fsn $(srctree) source
555 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
556 $(Q)test -e .gitignore || \
557 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
558endif
559
560# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
561# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
562# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
563# and from include/config/auto.conf.cmd to detect the compiler upgrade.
564CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1 | sed 's/\#//g')
565
566ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
567ifneq ($(CROSS_COMPILE),)
568CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
569GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
570CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
571GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
572endif
573ifneq ($(GCC_TOOLCHAIN),)
574CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
575endif
576ifneq ($(LLVM_IAS),1)
577CLANG_FLAGS += -no-integrated-as
578endif
579CLANG_FLAGS += -Werror=unknown-warning-option
580KBUILD_CFLAGS += $(CLANG_FLAGS)
581KBUILD_AFLAGS += $(CLANG_FLAGS)
582export CLANG_FLAGS
583endif
584
585ifdef config-build
586# ===========================================================================
587# *config targets only - make sure prerequisites are updated, and descend
588# in scripts/kconfig to make the *config target
589
590# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
591# KBUILD_DEFCONFIG may point out an alternative default configuration
592# used for 'make defconfig'
593include arch/$(SRCARCH)/Makefile
594export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
595
596config: outputmakefile scripts_basic FORCE
597 $(Q)$(MAKE) $(build)=scripts/kconfig $@
598
599%config: outputmakefile scripts_basic FORCE
600 $(Q)$(MAKE) $(build)=scripts/kconfig $@
601
602else #!config-build
603# ===========================================================================
604# Build targets only - this includes vmlinux, arch specific targets, clean
605# targets and others. In general all targets except *config targets.
606
607# If building an external module we do not care about the all: rule
608# but instead __all depend on modules
609PHONY += all
610ifeq ($(KBUILD_EXTMOD),)
611__all: all
612else
613__all: modules
614endif
615
616# Decide whether to build built-in, modular, or both.
617# Normally, just do built-in.
618
619KBUILD_MODULES :=
620KBUILD_BUILTIN := 1
621
622# If we have only "make modules", don't compile built-in objects.
623ifeq ($(MAKECMDGOALS),modules)
624 KBUILD_BUILTIN :=
625endif
626
627# If we have "make <whatever> modules", compile modules
628# in addition to whatever we do anyway.
629# Just "make" or "make all" shall build modules as well
630
631ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
632 KBUILD_MODULES := 1
633endif
634
635ifeq ($(MAKECMDGOALS),)
636 KBUILD_MODULES := 1
637endif
638
639export KBUILD_MODULES KBUILD_BUILTIN
640
641ifdef need-config
642include include/config/auto.conf
643endif
644
645ifeq ($(KBUILD_EXTMOD),)
646# Objects we will link into vmlinux / subdirs we need to visit
647core-y := init/ usr/
648drivers-y := drivers/ sound/
649drivers-$(CONFIG_SAMPLES) += samples/
650drivers-$(CONFIG_NET) += net/
651drivers-y += virt/
652libs-y := lib/
653endif # KBUILD_EXTMOD
654
655# The all: target is the default when no target is given on the
656# command line.
657# This allow a user to issue only 'make' to build a kernel including modules
658# Defaults to vmlinux, but the arch makefile usually adds further targets
659all: vmlinux
660
661CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
662 $(call cc-option,-fno-tree-loop-im) \
663 $(call cc-disable-warning,maybe-uninitialized,)
664export CFLAGS_GCOV
665
666# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
667ifdef CONFIG_FUNCTION_TRACER
668 CC_FLAGS_FTRACE := -pg
669endif
670
671RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
672RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
673RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
674RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
675RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
676RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
677export RETPOLINE_CFLAGS
678export RETPOLINE_VDSO_CFLAGS
679
680include arch/$(SRCARCH)/Makefile
681
682ifdef need-config
683ifdef may-sync-config
684# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
685# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
686# because some architectures define CROSS_COMPILE there.
687include include/config/auto.conf.cmd
688
689$(KCONFIG_CONFIG):
690 @echo >&2 '***'
691 @echo >&2 '*** Configuration file "$@" not found!'
692 @echo >&2 '***'
693 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
694 @echo >&2 '*** "make menuconfig" or "make xconfig").'
695 @echo >&2 '***'
696 @/bin/false
697
698# The actual configuration files used during the build are stored in
699# include/generated/ and include/config/. Update them if .config is newer than
700# include/config/auto.conf (which mirrors .config).
701#
702# This exploits the 'multi-target pattern rule' trick.
703# The syncconfig should be executed only once to make all the targets.
704# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
705quiet_cmd_syncconfig = SYNC $@
706 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig
707
708%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
709 +$(call cmd,syncconfig)
710else # !may-sync-config
711# External modules and some install targets need include/generated/autoconf.h
712# and include/config/auto.conf but do not care if they are up-to-date.
713# Use auto.conf to trigger the test
714PHONY += include/config/auto.conf
715
716include/config/auto.conf:
717 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
718 echo >&2; \
719 echo >&2 " ERROR: Kernel configuration is invalid."; \
720 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
721 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
722 echo >&2 ; \
723 /bin/false)
724
725endif # may-sync-config
726endif # need-config
727
728KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
729KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
730KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
731KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
732KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
733
734ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
735KBUILD_CFLAGS += -O2
736else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
737KBUILD_CFLAGS += -O3
738else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
739KBUILD_CFLAGS += -Os
740endif
741
742# Tell gcc to never replace conditional load with a non-conditional one
743KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
744KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
745
746ifdef CONFIG_READABLE_ASM
747# Disable optimizations that make assembler listings hard to read.
748# reorder blocks reorders the control in the function
749# ipa clone creates specialized cloned functions
750# partial inlining inlines only parts of functions
751KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
752 $(call cc-option,-fno-ipa-cp-clone,) \
753 $(call cc-option,-fno-partial-inlining)
754endif
755
756ifneq ($(CONFIG_FRAME_WARN),0)
757KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
758endif
759
760stackp-flags-y := -fno-stack-protector
761stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
762stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
763
764KBUILD_CFLAGS += $(stackp-flags-y)
765
766ifdef CONFIG_CC_IS_CLANG
767KBUILD_CPPFLAGS += -Qunused-arguments
768KBUILD_CFLAGS += -Wno-format-invalid-specifier
769KBUILD_CFLAGS += -Wno-gnu
770# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
771# source of a reference will be _MergedGlobals and not on of the whitelisted names.
772# See modpost pattern 2
773KBUILD_CFLAGS += -mno-global-merge
774else
775
776# These warnings generated too much noise in a regular build.
777# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
778KBUILD_CFLAGS += -Wno-unused-but-set-variable
779
780# Warn about unmarked fall-throughs in switch statement.
781# Disabled for clang while comment to attribute conversion happens and
782# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
783KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
784endif
785
786KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
787ifdef CONFIG_FRAME_POINTER
788KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
789else
790# Some targets (ARM with Thumb2, for example), can't be built with frame
791# pointers. For those, we don't have FUNCTION_TRACER automatically
792# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
793# incompatible with -fomit-frame-pointer with current GCC, so we don't use
794# -fomit-frame-pointer with FUNCTION_TRACER.
795ifndef CONFIG_FUNCTION_TRACER
796KBUILD_CFLAGS += -fomit-frame-pointer
797endif
798endif
799
800# Initialize all stack variables with a 0xAA pattern.
801ifdef CONFIG_INIT_STACK_ALL_PATTERN
802KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
803endif
804
805# Initialize all stack variables with a zero value.
806ifdef CONFIG_INIT_STACK_ALL_ZERO
807# Future support for zero initialization is still being debated, see
808# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
809# renamed or dropped.
810KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
811KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
812endif
813
814DEBUG_CFLAGS :=
815
816# Workaround for GCC versions < 5.0
817# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
818ifdef CONFIG_CC_IS_GCC
819DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
820endif
821
822ifdef CONFIG_DEBUG_INFO
823
824ifdef CONFIG_DEBUG_INFO_SPLIT
825DEBUG_CFLAGS += -gsplit-dwarf
826else
827DEBUG_CFLAGS += -g
828endif
829
830ifneq ($(LLVM_IAS),1)
831KBUILD_AFLAGS += -Wa,-gdwarf-2
832endif
833
834ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
835dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
836dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
837DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
838endif
839
840ifdef CONFIG_DEBUG_INFO_REDUCED
841DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
842 $(call cc-option,-fno-var-tracking)
843endif
844
845ifdef CONFIG_DEBUG_INFO_COMPRESSED
846DEBUG_CFLAGS += -gz=zlib
847KBUILD_AFLAGS += -gz=zlib
848KBUILD_LDFLAGS += --compress-debug-sections=zlib
849endif
850
851endif # CONFIG_DEBUG_INFO
852
853KBUILD_CFLAGS += $(DEBUG_CFLAGS)
854export DEBUG_CFLAGS
855
856ifdef CONFIG_FUNCTION_TRACER
857ifdef CONFIG_FTRACE_MCOUNT_USE_CC
858 CC_FLAGS_FTRACE += -mrecord-mcount
859 ifdef CONFIG_HAVE_NOP_MCOUNT
860 ifeq ($(call cc-option-yn, -mnop-mcount),y)
861 CC_FLAGS_FTRACE += -mnop-mcount
862 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
863 endif
864 endif
865endif
866ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
867 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
868endif
869ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
870 ifdef CONFIG_HAVE_C_RECORDMCOUNT
871 BUILD_C_RECORDMCOUNT := y
872 export BUILD_C_RECORDMCOUNT
873 endif
874endif
875ifdef CONFIG_HAVE_FENTRY
876 ifeq ($(call cc-option-yn, -mfentry),y)
877 CC_FLAGS_FTRACE += -mfentry
878 CC_FLAGS_USING += -DCC_USING_FENTRY
879 endif
880endif
881export CC_FLAGS_FTRACE
882KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
883KBUILD_AFLAGS += $(CC_FLAGS_USING)
884endif
885
886# We trigger additional mismatches with less inlining
887ifdef CONFIG_DEBUG_SECTION_MISMATCH
888KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
889endif
890
891ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
892KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
893LDFLAGS_vmlinux += --gc-sections
894endif
895
896ifdef CONFIG_SHADOW_CALL_STACK
897CC_FLAGS_SCS := -fsanitize=shadow-call-stack
898KBUILD_CFLAGS += $(CC_FLAGS_SCS)
899export CC_FLAGS_SCS
900endif
901
902ifdef CONFIG_LTO_CLANG
903ifdef CONFIG_LTO_CLANG_THIN
904CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
905KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache
906else
907CC_FLAGS_LTO := -flto
908endif
909CC_FLAGS_LTO += -fvisibility=hidden
910
911# Limit inlining across translation units to reduce binary size
912KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
913endif
914
915ifdef CONFIG_LTO
916KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
917KBUILD_AFLAGS += -fno-lto
918export CC_FLAGS_LTO
919endif
920
921ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
922KBUILD_CFLAGS += -falign-functions=32
923endif
924
925# arch Makefile may override CC so keep this after arch Makefile is included
926NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
927
928# warn about C99 declaration after statement
929KBUILD_CFLAGS += -Wdeclaration-after-statement
930
931# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
932KBUILD_CFLAGS += -Wvla
933
934# disable pointer signed / unsigned warnings in gcc 4.0
935KBUILD_CFLAGS += -Wno-pointer-sign
936
937# disable stringop warnings in gcc 8+
938KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
939
940# We'll want to enable this eventually, but it's not going away for 5.7 at least
941KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
942KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
943KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
944
945# Another good warning that we'll want to enable eventually
946KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
947
948# Enabled with W=2, disabled by default as noisy
949KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
950
951# disable invalid "can't wrap" optimizations for signed / pointers
952KBUILD_CFLAGS += -fno-strict-overflow
953
954# Make sure -fstack-check isn't enabled (like gentoo apparently did)
955KBUILD_CFLAGS += -fno-stack-check
956
957# conserve stack if available
958KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
959
960# Prohibit date/time macros, which would make the build non-deterministic
961KBUILD_CFLAGS += -Werror=date-time
962
963# enforce correct pointer usage
964KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
965
966# Require designated initializers for all marked structures
967KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
968
969# change __FILE__ to the relative path from the srctree
970KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
971
972# include additional Makefiles when needed
973include-y := scripts/Makefile.extrawarn
974include-$(CONFIG_KASAN) += scripts/Makefile.kasan
975include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
976include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
977include-$(CONFIG_KCOV) += scripts/Makefile.kcov
978include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
979
980include $(addprefix $(srctree)/, $(include-y))
981
982# scripts/Makefile.gcc-plugins is intentionally included last.
983# Do not add $(call cc-option,...) below this line. When you build the kernel
984# from the clean source tree, the GCC plugins do not exist at this point.
985
986# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
987KBUILD_CPPFLAGS += $(KCPPFLAGS)
988KBUILD_AFLAGS += $(KAFLAGS)
989KBUILD_CFLAGS += $(KCFLAGS)
990
991KBUILD_LDFLAGS_MODULE += --build-id=sha1
992LDFLAGS_vmlinux += --build-id=sha1
993
994ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
995LDFLAGS_vmlinux += $(call ld-option, -X,)
996endif
997
998ifeq ($(CONFIG_RELR),y)
999LDFLAGS_vmlinux += --pack-dyn-relocs=relr
1000endif
1001
1002# We never want expected sections to be placed heuristically by the
1003# linker. All sections should be explicitly named in the linker script.
1004ifdef CONFIG_LD_ORPHAN_WARN
1005LDFLAGS_vmlinux += --orphan-handling=warn
1006endif
1007
1008# Align the bit size of userspace programs with the kernel
1009KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1010KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1011
1012# make the checker run with the right architecture
1013CHECKFLAGS += --arch=$(ARCH)
1014
1015# insure the checker run with the right endianness
1016CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1017
1018# the checker needs the correct machine size
1019CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1020
1021# Default kernel image to build when no specific target is given.
1022# KBUILD_IMAGE may be overruled on the command line or
1023# set in the environment
1024# Also any assignments in arch/$(ARCH)/Makefile take precedence over
1025# this default value
1026export KBUILD_IMAGE ?= vmlinux
1027
1028#
1029# INSTALL_PATH specifies where to place the updated kernel and system map
1030# images. Default is /boot, but you can set it to other values
1031export INSTALL_PATH ?= /boot
1032
1033#
1034# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1035# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1036# an argument if needed. Otherwise it defaults to the kernel install path
1037#
1038export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1039
1040#
1041# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1042# relocations required by build roots. This is not defined in the
1043# makefile but the argument can be passed to make if needed.
1044#
1045
1046MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1047export MODLIB
1048
1049#
1050# INSTALL_MOD_STRIP, if defined, will cause modules to be
1051# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1052# the default option --strip-debug will be used. Otherwise,
1053# INSTALL_MOD_STRIP value will be used as the options to the strip command.
1054
1055ifdef INSTALL_MOD_STRIP
1056ifeq ($(INSTALL_MOD_STRIP),1)
1057mod_strip_cmd = $(STRIP) --strip-debug
1058else
1059mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1060endif # INSTALL_MOD_STRIP=1
1061else
1062mod_strip_cmd = true
1063endif # INSTALL_MOD_STRIP
1064export mod_strip_cmd
1065
1066# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1067# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1068# or CONFIG_MODULE_COMPRESS_XZ.
1069
1070mod_compress_cmd = true
1071ifdef CONFIG_MODULE_COMPRESS
1072 ifdef CONFIG_MODULE_COMPRESS_GZIP
1073 mod_compress_cmd = $(KGZIP) -n -f
1074 endif # CONFIG_MODULE_COMPRESS_GZIP
1075 ifdef CONFIG_MODULE_COMPRESS_XZ
1076 mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f
1077 endif # CONFIG_MODULE_COMPRESS_XZ
1078endif # CONFIG_MODULE_COMPRESS
1079export mod_compress_cmd
1080
1081ifdef CONFIG_MODULE_SIG_ALL
1082$(eval $(call config_filename,MODULE_SIG_KEY))
1083
1084mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1085else
1086mod_sign_cmd = true
1087endif
1088export mod_sign_cmd
1089
1090HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1091
1092has_libelf = $(call try-run,\
1093 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1094
1095ifdef CONFIG_STACK_VALIDATION
1096 ifeq ($(has_libelf),1)
1097 objtool_target := tools/objtool FORCE
1098 else
1099 SKIP_STACK_VALIDATION := 1
1100 export SKIP_STACK_VALIDATION
1101 endif
1102endif
1103
1104PHONY += resolve_btfids_clean
1105
1106resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1107
1108# tools/bpf/resolve_btfids directory might not exist
1109# in output directory, skip its clean in that case
1110resolve_btfids_clean:
1111ifneq ($(wildcard $(resolve_btfids_O)),)
1112 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1113endif
1114
1115ifdef CONFIG_BPF
1116ifdef CONFIG_DEBUG_INFO_BTF
1117 ifeq ($(has_libelf),1)
1118 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1119 else
1120 ERROR_RESOLVE_BTFIDS := 1
1121 endif
1122endif # CONFIG_DEBUG_INFO_BTF
1123endif # CONFIG_BPF
1124
1125PHONY += prepare0
1126
1127extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1128export MODORDER := $(extmod-prefix)modules.order
1129export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1130
1131ifeq ($(KBUILD_EXTMOD),)
1132core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1133
1134vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1135 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1136 $(libs-y) $(libs-m)))
1137
1138vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1139 $(patsubst %/,%,$(filter %/, $(core-) \
1140 $(drivers-) $(libs-))))
1141
1142subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1143 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1144 $(drivers-y) $(drivers-m)))
1145
1146build-dirs := $(vmlinux-dirs)
1147clean-dirs := $(vmlinux-alldirs)
1148
1149# Externally visible symbols (used by link-vmlinux.sh)
1150KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1151KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1152ifdef CONFIG_MODULES
1153KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1154KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1155else
1156KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1157endif
1158KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1159
1160export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1161export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1162# used by scripts/Makefile.package
1163export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1164
1165vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1166
1167# Recurse until adjust_autoksyms.sh is satisfied
1168PHONY += autoksyms_recursive
1169ifdef CONFIG_TRIM_UNUSED_KSYMS
1170# For the kernel to actually contain only the needed exported symbols,
1171# we have to build modules as well to determine what those symbols are.
1172# (this can be evaluated only once include/config/auto.conf has been included)
1173KBUILD_MODULES := 1
1174
1175autoksyms_recursive: descend modules.order
1176 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1177 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1178endif
1179
1180autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1181
1182quiet_cmd_autoksyms_h = GEN $@
1183 cmd_autoksyms_h = mkdir -p $(dir $@); \
1184 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1185
1186$(autoksyms_h):
1187 $(call cmd,autoksyms_h)
1188
1189ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1190
1191# Final link of vmlinux with optional arch pass after final link
1192cmd_link-vmlinux = \
1193 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1194 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1195
1196vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1197 +$(call if_changed,link-vmlinux)
1198
1199targets := vmlinux
1200
1201# The actual objects are generated when descending,
1202# make sure no implicit rule kicks in
1203$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1204
1205filechk_kernel.release = \
1206 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1207
1208# Store (new) KERNELRELEASE string in include/config/kernel.release
1209include/config/kernel.release: FORCE
1210 $(call filechk,kernel.release)
1211
1212# Additional helpers built in scripts/
1213# Carefully list dependencies so we do not try to build scripts twice
1214# in parallel
1215PHONY += scripts
1216scripts: scripts_basic scripts_dtc
1217 $(Q)$(MAKE) $(build)=$(@)
1218
1219# Things we need to do before we recursively start building the kernel
1220# or the modules are listed in "prepare".
1221# A multi level approach is used. prepareN is processed before prepareN-1.
1222# archprepare is used in arch Makefiles and when processed asm symlink,
1223# version.h and scripts_basic is processed / created.
1224
1225PHONY += prepare archprepare
1226
1227archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1228 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1229 include/generated/autoconf.h
1230
1231prepare0: archprepare
1232 $(Q)$(MAKE) $(build)=scripts/mod
1233 $(Q)$(MAKE) $(build)=.
1234
1235# All the preparing..
1236prepare: prepare0 prepare-objtool prepare-resolve_btfids
1237
1238# Support for using generic headers in asm-generic
1239asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1240
1241PHONY += asm-generic uapi-asm-generic
1242asm-generic: uapi-asm-generic
1243 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1244 generic=include/asm-generic
1245uapi-asm-generic:
1246 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1247 generic=include/uapi/asm-generic
1248
1249PHONY += prepare-objtool prepare-resolve_btfids
1250prepare-objtool: $(objtool_target)
1251ifeq ($(SKIP_STACK_VALIDATION),1)
1252ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
1253 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1254 @false
1255endif
1256ifdef CONFIG_UNWINDER_ORC
1257 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1258 @false
1259else
1260 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1261endif
1262endif
1263
1264prepare-resolve_btfids: $(resolve_btfids_target)
1265ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1266 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1267 @false
1268endif
1269# Generate some files
1270# ---------------------------------------------------------------------------
1271
1272# KERNELRELEASE can change from a few different places, meaning version.h
1273# needs to be updated, so this check is forced on all builds
1274
1275uts_len := 64
1276define filechk_utsrelease.h
1277 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1278 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1279 exit 1; \
1280 fi; \
1281 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1282endef
1283
1284define filechk_version.h
1285 if [ $(SUBLEVEL) -gt 255 ]; then \
1286 echo \#define LINUX_VERSION_CODE $(shell \
1287 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1288 else \
1289 echo \#define LINUX_VERSION_CODE $(shell \
1290 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1291 fi; \
1292 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1293 ((c) > 255 ? 255 : (c)))'; \
1294 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1295 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1296 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1297endef
1298
1299$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1300$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1301$(version_h): FORCE
1302 $(call filechk,version.h)
1303
1304include/generated/utsrelease.h: include/config/kernel.release FORCE
1305 $(call filechk,utsrelease.h)
1306
1307PHONY += headerdep
1308headerdep:
1309 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1310 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1311
1312# ---------------------------------------------------------------------------
1313# Kernel headers
1314
1315#Default location for installed headers
1316export INSTALL_HDR_PATH = $(objtree)/usr
1317
1318quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1319 cmd_headers_install = \
1320 mkdir -p $(INSTALL_HDR_PATH); \
1321 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1322 usr/include $(INSTALL_HDR_PATH)
1323
1324PHONY += headers_install
1325headers_install: headers
1326 $(call cmd,headers_install)
1327
1328PHONY += archheaders archscripts
1329
1330hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1331
1332PHONY += headers
1333headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1334 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1335 $(error Headers not exportable for the $(SRCARCH) architecture))
1336 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1337 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1338
1339# Deprecated. It is no-op now.
1340PHONY += headers_check
1341headers_check:
1342 @:
1343
1344ifdef CONFIG_HEADERS_INSTALL
1345prepare: headers
1346endif
1347
1348PHONY += scripts_unifdef
1349scripts_unifdef: scripts_basic
1350 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1351
1352# ---------------------------------------------------------------------------
1353# Kernel selftest
1354
1355PHONY += kselftest
1356kselftest:
1357 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1358
1359kselftest-%: FORCE
1360 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1361
1362PHONY += kselftest-merge
1363kselftest-merge:
1364 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1365 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1366 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1367 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1368
1369# ---------------------------------------------------------------------------
1370# Devicetree files
1371
1372ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1373dtstree := arch/$(SRCARCH)/boot/dts
1374endif
1375
1376ifneq ($(dtstree),)
1377
1378%.dtb: include/config/kernel.release scripts_dtc
1379 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1380
1381%.dtbo: include/config/kernel.release scripts_dtc
1382 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1383
1384PHONY += dtbs dtbs_install dtbs_check
1385dtbs: include/config/kernel.release scripts_dtc
1386 $(Q)$(MAKE) $(build)=$(dtstree)
1387
1388ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1389export CHECK_DTBS=y
1390dtbs: dt_binding_check
1391endif
1392
1393dtbs_check: dtbs
1394
1395dtbs_install:
1396 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1397
1398ifdef CONFIG_OF_EARLY_FLATTREE
1399all: dtbs
1400endif
1401
1402endif
1403
1404PHONY += scripts_dtc
1405scripts_dtc: scripts_basic
1406 $(Q)$(MAKE) $(build)=scripts/dtc
1407
1408ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1409export CHECK_DT_BINDING=y
1410endif
1411
1412PHONY += dt_binding_check
1413dt_binding_check: scripts_dtc
1414 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1415
1416# ---------------------------------------------------------------------------
1417# Modules
1418
1419ifdef CONFIG_MODULES
1420
1421# By default, build modules as well
1422
1423all: modules
1424
1425# When we're building modules with modversions, we need to consider
1426# the built-in objects during the descend as well, in order to
1427# make sure the checksums are up to date before we record them.
1428ifdef CONFIG_MODVERSIONS
1429 KBUILD_BUILTIN := 1
1430endif
1431
1432# Build modules
1433#
1434# A module can be listed more than once in obj-m resulting in
1435# duplicate lines in modules.order files. Those are removed
1436# using awk while concatenating to the final file.
1437
1438PHONY += modules
1439modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1440 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1441
1442PHONY += modules_check
1443modules_check: modules.order
1444 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1445
1446cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1447
1448modules.order: $(subdir-modorder) FORCE
1449 $(call if_changed,modules_order)
1450
1451targets += modules.order
1452
1453# Target to prepare building external modules
1454PHONY += modules_prepare
1455modules_prepare: prepare
1456 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1457
1458# Target to install modules
1459PHONY += modules_install
1460modules_install: _modinst_ _modinst_post
1461
1462PHONY += _modinst_
1463_modinst_:
1464 @rm -rf $(MODLIB)/kernel
1465 @rm -f $(MODLIB)/source
1466 @mkdir -p $(MODLIB)/kernel
1467 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1468 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1469 rm -f $(MODLIB)/build ; \
1470 ln -s $(CURDIR) $(MODLIB)/build ; \
1471 fi
1472 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1473 @cp -f modules.builtin $(MODLIB)/
1474 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1475 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1476
1477# This depmod is only for convenience to give the initial
1478# boot a modules.dep even before / is mounted read-write. However the
1479# boot script depmod is the master version.
1480PHONY += _modinst_post
1481_modinst_post: _modinst_
1482 $(call cmd,depmod)
1483
1484ifeq ($(CONFIG_MODULE_SIG), y)
1485PHONY += modules_sign
1486modules_sign:
1487 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1488endif
1489
1490else # CONFIG_MODULES
1491
1492# Modules not configured
1493# ---------------------------------------------------------------------------
1494
1495PHONY += modules modules_install
1496modules modules_install:
1497 @echo >&2
1498 @echo >&2 "The present kernel configuration has modules disabled."
1499 @echo >&2 "Type 'make config' and enable loadable module support."
1500 @echo >&2 "Then build a kernel with module support enabled."
1501 @echo >&2
1502 @exit 1
1503
1504endif # CONFIG_MODULES
1505
1506###
1507# Cleaning is done on three levels.
1508# make clean Delete most generated files
1509# Leave enough to build external modules
1510# make mrproper Delete the current configuration, and all generated files
1511# make distclean Remove editor backup files, patch leftover files and the like
1512
1513# Directories & files removed with 'make clean'
1514CLEAN_FILES += include/ksym vmlinux.symvers \
1515 modules.builtin modules.builtin.modinfo modules.nsdeps \
1516 compile_commands.json .thinlto-cache
1517
1518# Directories & files removed with 'make mrproper'
1519MRPROPER_FILES += include/config include/generated \
1520 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1521 debian snap tar-install \
1522 .config .config.old .version \
1523 Module.symvers \
1524 signing_key.pem signing_key.priv signing_key.x509 \
1525 x509.genkey extra_certificates signing_key.x509.keyid \
1526 signing_key.x509.signer vmlinux-gdb.py \
1527 *.spec
1528
1529# Directories & files removed with 'make distclean'
1530DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1531
1532# clean - Delete most, but leave enough to build external modules
1533#
1534clean: rm-files := $(CLEAN_FILES)
1535
1536PHONY += archclean vmlinuxclean
1537
1538vmlinuxclean:
1539 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1540 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1541
1542clean: archclean vmlinuxclean resolve_btfids_clean
1543
1544# mrproper - Delete all generated files, including .config
1545#
1546mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1547mrproper-dirs := $(addprefix _mrproper_,scripts)
1548
1549PHONY += $(mrproper-dirs) mrproper
1550$(mrproper-dirs):
1551 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1552
1553mrproper: clean $(mrproper-dirs)
1554 $(call cmd,rmfiles)
1555
1556# distclean
1557#
1558distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1559
1560PHONY += distclean
1561
1562distclean: mrproper
1563 $(call cmd,rmfiles)
1564 @find $(srctree) $(RCS_FIND_IGNORE) \
1565 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1566 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1567 -o -name 'core' \) \
1568 -type f -print | xargs rm -f
1569
1570
1571# Packaging of the kernel to various formats
1572# ---------------------------------------------------------------------------
1573
1574%src-pkg: FORCE
1575 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1576%pkg: include/config/kernel.release FORCE
1577 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1578
1579# Brief documentation of the typical targets used
1580# ---------------------------------------------------------------------------
1581
1582boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1583boards := $(sort $(notdir $(boards)))
1584board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1585board-dirs := $(sort $(notdir $(board-dirs:/=)))
1586
1587PHONY += help
1588help:
1589 @echo 'Cleaning targets:'
1590 @echo ' clean - Remove most generated files but keep the config and'
1591 @echo ' enough build support to build external modules'
1592 @echo ' mrproper - Remove all generated files + config + various backup files'
1593 @echo ' distclean - mrproper + remove editor backup and patch files'
1594 @echo ''
1595 @echo 'Configuration targets:'
1596 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1597 @echo ''
1598 @echo 'Other generic targets:'
1599 @echo ' all - Build all targets marked with [*]'
1600 @echo '* vmlinux - Build the bare kernel'
1601 @echo '* modules - Build all modules'
1602 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1603 @echo ' dir/ - Build all files in dir and below'
1604 @echo ' dir/file.[ois] - Build specified target only'
1605 @echo ' dir/file.ll - Build the LLVM assembly file'
1606 @echo ' (requires compiler support for LLVM assembly generation)'
1607 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1608 @echo ' (requires a recent binutils and recent build (System.map))'
1609 @echo ' dir/file.ko - Build module including final link'
1610 @echo ' modules_prepare - Set up for building external modules'
1611 @echo ' tags/TAGS - Generate tags file for editors'
1612 @echo ' cscope - Generate cscope index'
1613 @echo ' gtags - Generate GNU GLOBAL index'
1614 @echo ' kernelrelease - Output the release version string (use with make -s)'
1615 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1616 @echo ' image_name - Output the image name (use with make -s)'
1617 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1618 echo ' (default: $(INSTALL_HDR_PATH))'; \
1619 echo ''
1620 @echo 'Static analysers:'
1621 @echo ' checkstack - Generate a list of stack hogs'
1622 @echo ' versioncheck - Sanity check on version.h usage'
1623 @echo ' includecheck - Check for duplicate included header files'
1624 @echo ' export_report - List the usages of all exported symbols'
1625 @echo ' headerdep - Detect inclusion cycles in headers'
1626 @echo ' coccicheck - Check with Coccinelle'
1627 @echo ' clang-analyzer - Check with clang static analyzer'
1628 @echo ' clang-tidy - Check with clang-tidy'
1629 @echo ''
1630 @echo 'Tools:'
1631 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1632 @echo ''
1633 @echo 'Kernel selftest:'
1634 @echo ' kselftest - Build and run kernel selftest'
1635 @echo ' Build, install, and boot kernel before'
1636 @echo ' running kselftest on it'
1637 @echo ' Run as root for full coverage'
1638 @echo ' kselftest-all - Build kernel selftest'
1639 @echo ' kselftest-install - Build and install kernel selftest'
1640 @echo ' kselftest-clean - Remove all generated kselftest files'
1641 @echo ' kselftest-merge - Merge all the config dependencies of'
1642 @echo ' kselftest to existing .config.'
1643 @echo ''
1644 @$(if $(dtstree), \
1645 echo 'Devicetree:'; \
1646 echo '* dtbs - Build device tree blobs for enabled boards'; \
1647 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1648 echo ' dt_binding_check - Validate device tree binding documents'; \
1649 echo ' dtbs_check - Validate device tree source files';\
1650 echo '')
1651
1652 @echo 'Userspace tools targets:'
1653 @echo ' use "make tools/help"'
1654 @echo ' or "cd tools; make help"'
1655 @echo ''
1656 @echo 'Kernel packaging:'
1657 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1658 @echo ''
1659 @echo 'Documentation targets:'
1660 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1661 @echo ''
1662 @echo 'Architecture specific targets ($(SRCARCH)):'
1663 @$(if $(archhelp),$(archhelp),\
1664 echo ' No architecture specific help defined for $(SRCARCH)')
1665 @echo ''
1666 @$(if $(boards), \
1667 $(foreach b, $(boards), \
1668 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1669 echo '')
1670 @$(if $(board-dirs), \
1671 $(foreach b, $(board-dirs), \
1672 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1673 printf " %-16s - Show all of the above\\n" help-boards; \
1674 echo '')
1675
1676 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1677 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1678 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1679 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1680 @echo ' (sparse by default)'
1681 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1682 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1683 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1684 @echo ' 1: warnings which may be relevant and do not occur too often'
1685 @echo ' 2: warnings which occur quite often but may still be relevant'
1686 @echo ' 3: more obscure warnings, can most likely be ignored'
1687 @echo ' Multiple levels can be combined with W=12 or W=123'
1688 @echo ''
1689 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1690 @echo 'For further info see the ./README file'
1691
1692
1693help-board-dirs := $(addprefix help-,$(board-dirs))
1694
1695help-boards: $(help-board-dirs)
1696
1697boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1698
1699$(help-board-dirs): help-%:
1700 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1701 @$(if $(boards-per-dir), \
1702 $(foreach b, $(boards-per-dir), \
1703 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1704 echo '')
1705
1706
1707# Documentation targets
1708# ---------------------------------------------------------------------------
1709DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1710 linkcheckdocs dochelp refcheckdocs
1711PHONY += $(DOC_TARGETS)
1712$(DOC_TARGETS):
1713 $(Q)$(MAKE) $(build)=Documentation $@
1714
1715# Misc
1716# ---------------------------------------------------------------------------
1717
1718PHONY += scripts_gdb
1719scripts_gdb: prepare0
1720 $(Q)$(MAKE) $(build)=scripts/gdb
1721 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1722
1723ifdef CONFIG_GDB_SCRIPTS
1724all: scripts_gdb
1725endif
1726
1727else # KBUILD_EXTMOD
1728
1729###
1730# External module support.
1731# When building external modules the kernel used as basis is considered
1732# read-only, and no consistency checks are made and the make
1733# system is not used on the basis kernel. If updates are required
1734# in the basis kernel ordinary make commands (without M=...) must
1735# be used.
1736#
1737# The following are the only valid targets when building external
1738# modules.
1739# make M=dir clean Delete all automatically generated files
1740# make M=dir modules Make all modules in specified dir
1741# make M=dir Same as 'make M=dir modules'
1742# make M=dir modules_install
1743# Install the modules built in the module directory
1744# Assumes install directory is already created
1745
1746# We are always building only modules.
1747KBUILD_BUILTIN :=
1748KBUILD_MODULES := 1
1749
1750build-dirs := $(KBUILD_EXTMOD)
1751PHONY += modules
1752modules: $(MODORDER)
1753 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1754
1755$(MODORDER): descend
1756 @:
1757
1758PHONY += modules_install
1759modules_install: _emodinst_ _emodinst_post
1760
1761install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1762PHONY += _emodinst_
1763_emodinst_:
1764 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1765 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1766
1767PHONY += _emodinst_post
1768_emodinst_post: _emodinst_
1769 $(call cmd,depmod)
1770
1771compile_commands.json: $(extmod-prefix)compile_commands.json
1772PHONY += compile_commands.json
1773
1774clean-dirs := $(KBUILD_EXTMOD)
1775clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1776 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1777
1778PHONY += help
1779help:
1780 @echo ' Building external modules.'
1781 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1782 @echo ''
1783 @echo ' modules - default target, build the module(s)'
1784 @echo ' modules_install - install the module'
1785 @echo ' clean - remove generated files in module directory only'
1786 @echo ''
1787
1788# no-op for external module builds
1789PHONY += prepare modules_prepare
1790
1791endif # KBUILD_EXTMOD
1792
1793# Single targets
1794# ---------------------------------------------------------------------------
1795# To build individual files in subdirectories, you can do like this:
1796#
1797# make foo/bar/baz.s
1798#
1799# The supported suffixes for single-target are listed in 'single-targets'
1800#
1801# To build only under specific subdirectories, you can do like this:
1802#
1803# make foo/bar/baz/
1804
1805ifdef single-build
1806
1807# .ko is special because modpost is needed
1808single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1809single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1810
1811$(single-ko): single_modpost
1812 @:
1813$(single-no-ko): descend
1814 @:
1815
1816ifeq ($(KBUILD_EXTMOD),)
1817# For the single build of in-tree modules, use a temporary file to avoid
1818# the situation of modules_install installing an invalid modules.order.
1819MODORDER := .modules.tmp
1820endif
1821
1822PHONY += single_modpost
1823single_modpost: $(single-no-ko) modules_prepare
1824 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1825 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1826
1827KBUILD_MODULES := 1
1828
1829export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1830
1831# trim unrelated directories
1832build-dirs := $(foreach d, $(build-dirs), \
1833 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1834
1835endif
1836
1837ifndef CONFIG_MODULES
1838KBUILD_MODULES :=
1839endif
1840
1841# Handle descending into subdirectories listed in $(build-dirs)
1842# Preset locale variables to speed up the build process. Limit locale
1843# tweaks to this spot to avoid wrong language settings when running
1844# make menuconfig etc.
1845# Error messages still appears in the original language
1846PHONY += descend $(build-dirs)
1847descend: $(build-dirs)
1848$(build-dirs): prepare
1849 $(Q)$(MAKE) $(build)=$@ \
1850 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1851 need-builtin=1 need-modorder=1
1852
1853clean-dirs := $(addprefix _clean_, $(clean-dirs))
1854PHONY += $(clean-dirs) clean
1855$(clean-dirs):
1856 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1857
1858clean: $(clean-dirs)
1859 $(call cmd,rmfiles)
1860 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1861 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1862 -o -name '*.ko.*' \
1863 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1864 -o -name '*.dwo' -o -name '*.lst' \
1865 -o -name '*.su' -o -name '*.mod' \
1866 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1867 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1868 -o -name '*.asn1.[ch]' \
1869 -o -name '*.symtypes' -o -name 'modules.order' \
1870 -o -name '.tmp_*.o.*' \
1871 -o -name '*.c.[012]*.*' \
1872 -o -name '*.ll' \
1873 -o -name '*.gcno' \
1874 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1875
1876# Generate tags for editors
1877# ---------------------------------------------------------------------------
1878quiet_cmd_tags = GEN $@
1879 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1880
1881tags TAGS cscope gtags: FORCE
1882 $(call cmd,tags)
1883
1884# Script to generate missing namespace dependencies
1885# ---------------------------------------------------------------------------
1886
1887PHONY += nsdeps
1888nsdeps: export KBUILD_NSDEPS=1
1889nsdeps: modules
1890 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1891
1892# Clang Tooling
1893# ---------------------------------------------------------------------------
1894
1895quiet_cmd_gen_compile_commands = GEN $@
1896 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1897
1898$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1899 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1900 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1901 $(call if_changed,gen_compile_commands)
1902
1903targets += $(extmod-prefix)compile_commands.json
1904
1905PHONY += clang-tidy clang-analyzer
1906
1907ifdef CONFIG_CC_IS_CLANG
1908quiet_cmd_clang_tools = CHECK $<
1909 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1910
1911clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1912 $(call cmd,clang_tools)
1913else
1914clang-tidy clang-analyzer:
1915 @echo "$@ requires CC=clang" >&2
1916 @false
1917endif
1918
1919# Scripts to check various things for consistency
1920# ---------------------------------------------------------------------------
1921
1922PHONY += includecheck versioncheck coccicheck export_report
1923
1924includecheck:
1925 find $(srctree)/* $(RCS_FIND_IGNORE) \
1926 -name '*.[hcS]' -type f -print | sort \
1927 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1928
1929versioncheck:
1930 find $(srctree)/* $(RCS_FIND_IGNORE) \
1931 -name '*.[hcS]' -type f -print | sort \
1932 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1933
1934coccicheck:
1935 $(Q)$(BASH) $(srctree)/scripts/$@
1936
1937export_report:
1938 $(PERL) $(srctree)/scripts/export_report.pl
1939
1940PHONY += checkstack kernelrelease kernelversion image_name
1941
1942# UML needs a little special treatment here. It wants to use the host
1943# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1944# else wants $(ARCH), including people doing cross-builds, which means
1945# that $(SUBARCH) doesn't work here.
1946ifeq ($(ARCH), um)
1947CHECKSTACK_ARCH := $(SUBARCH)
1948else
1949CHECKSTACK_ARCH := $(ARCH)
1950endif
1951checkstack:
1952 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1953 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1954
1955kernelrelease:
1956 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1957
1958kernelversion:
1959 @echo $(KERNELVERSION)
1960
1961image_name:
1962 @echo $(KBUILD_IMAGE)
1963
1964# Clear a bunch of variables before executing the submake
1965
1966ifeq ($(quiet),silent_)
1967tools_silent=s
1968endif
1969
1970tools/: FORCE
1971 $(Q)mkdir -p $(objtree)/tools
1972 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1973
1974tools/%: FORCE
1975 $(Q)mkdir -p $(objtree)/tools
1976 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1977
1978quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1979 cmd_rmfiles = rm -rf $(rm-files)
1980
1981# Run depmod only if we have System.map and depmod is executable
1982quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1983 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1984 $(KERNELRELEASE)
1985
1986# read saved command lines for existing targets
1987existing-targets := $(wildcard $(sort $(targets)))
1988
1989-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1990
1991endif # config-build
1992endif # mixed-build
1993endif # need-sub-make
1994
1995PHONY += FORCE
1996FORCE:
1997
1998# Declare the contents of the PHONY variable as phony. We keep that
1999# information in a variable so we can use it in if_changed and friends.
2000.PHONY: $(PHONY)