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 = 9
4SUBLEVEL = 0
5EXTRAVERSION = -rc1
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
451RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
452LEX = flex
453YACC = bison
454AWK = awk
455INSTALLKERNEL := installkernel
456DEPMOD = /sbin/depmod
457PERL = perl
458PYTHON = python
459PYTHON3 = python3
460CHECK = sparse
461BASH = bash
462KGZIP = gzip
463KBZIP2 = bzip2
464KLZOP = lzop
465LZMA = lzma
466LZ4 = lz4c
467XZ = xz
468ZSTD = zstd
469
470CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
471 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
472NOSTDINC_FLAGS :=
473CFLAGS_MODULE =
474AFLAGS_MODULE =
475LDFLAGS_MODULE =
476CFLAGS_KERNEL =
477AFLAGS_KERNEL =
478LDFLAGS_vmlinux =
479
480# Use USERINCLUDE when you must reference the UAPI directories only.
481USERINCLUDE := \
482 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
483 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
484 -I$(srctree)/include/uapi \
485 -I$(objtree)/include/generated/uapi \
486 -include $(srctree)/include/linux/kconfig.h
487
488# Use LINUXINCLUDE when you must reference the include/ directory.
489# Needed to be compatible with the O= option
490LINUXINCLUDE := \
491 -I$(srctree)/arch/$(SRCARCH)/include \
492 -I$(objtree)/arch/$(SRCARCH)/include/generated \
493 $(if $(building_out_of_srctree),-I$(srctree)/include) \
494 -I$(objtree)/include \
495 $(USERINCLUDE)
496
497KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
498KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
499 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
500 -Werror=implicit-function-declaration -Werror=implicit-int \
501 -Wno-format-security \
502 -std=gnu89
503KBUILD_CPPFLAGS := -D__KERNEL__
504KBUILD_AFLAGS_KERNEL :=
505KBUILD_CFLAGS_KERNEL :=
506KBUILD_AFLAGS_MODULE := -DMODULE
507KBUILD_CFLAGS_MODULE := -DMODULE
508KBUILD_LDFLAGS_MODULE :=
509export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
510KBUILD_LDFLAGS :=
511CLANG_FLAGS :=
512
513export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
514export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
515export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
516export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
517export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
518
519export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
520export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
521export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN
522export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
523export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
524export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
525
526# Files to ignore in find ... statements
527
528export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
529 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
530 -prune -o
531export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
532 --exclude CVS --exclude .pc --exclude .hg --exclude .git
533
534# ===========================================================================
535# Rules shared between *config targets and build targets
536
537# Basic helpers built in scripts/basic/
538PHONY += scripts_basic
539scripts_basic:
540 $(Q)$(MAKE) $(build)=scripts/basic
541 $(Q)rm -f .tmp_quiet_recordmcount
542
543PHONY += outputmakefile
544# Before starting out-of-tree build, make sure the source tree is clean.
545# outputmakefile generates a Makefile in the output directory, if using a
546# separate output directory. This allows convenient use of make in the
547# output directory.
548# At the same time when output Makefile generated, generate .gitignore to
549# ignore whole output directory
550outputmakefile:
551ifdef building_out_of_srctree
552 $(Q)if [ -f $(srctree)/.config -o \
553 -d $(srctree)/include/config -o \
554 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
555 echo >&2 "***"; \
556 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
557 echo >&2 "*** in $(abs_srctree)";\
558 echo >&2 "***"; \
559 false; \
560 fi
561 $(Q)ln -fsn $(srctree) source
562 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
563 $(Q)test -e .gitignore || \
564 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
565endif
566
567ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
568ifneq ($(CROSS_COMPILE),)
569CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
570GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
571CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
572GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
573endif
574ifneq ($(GCC_TOOLCHAIN),)
575CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
576endif
577ifneq ($(LLVM_IAS),1)
578CLANG_FLAGS += -no-integrated-as
579endif
580CLANG_FLAGS += -Werror=unknown-warning-option
581KBUILD_CFLAGS += $(CLANG_FLAGS)
582KBUILD_AFLAGS += $(CLANG_FLAGS)
583export CLANG_FLAGS
584endif
585
586# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
587# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
588# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
589# and from include/config/auto.conf.cmd to detect the compiler upgrade.
590CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
591
592ifdef config-build
593# ===========================================================================
594# *config targets only - make sure prerequisites are updated, and descend
595# in scripts/kconfig to make the *config target
596
597# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
598# KBUILD_DEFCONFIG may point out an alternative default configuration
599# used for 'make defconfig'
600include arch/$(SRCARCH)/Makefile
601export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
602
603config: outputmakefile scripts_basic FORCE
604 $(Q)$(MAKE) $(build)=scripts/kconfig $@
605
606%config: outputmakefile scripts_basic FORCE
607 $(Q)$(MAKE) $(build)=scripts/kconfig $@
608
609else #!config-build
610# ===========================================================================
611# Build targets only - this includes vmlinux, arch specific targets, clean
612# targets and others. In general all targets except *config targets.
613
614# If building an external module we do not care about the all: rule
615# but instead __all depend on modules
616PHONY += all
617ifeq ($(KBUILD_EXTMOD),)
618__all: all
619else
620__all: modules
621endif
622
623# Decide whether to build built-in, modular, or both.
624# Normally, just do built-in.
625
626KBUILD_MODULES :=
627KBUILD_BUILTIN := 1
628
629# If we have only "make modules", don't compile built-in objects.
630ifeq ($(MAKECMDGOALS),modules)
631 KBUILD_BUILTIN :=
632endif
633
634# If we have "make <whatever> modules", compile modules
635# in addition to whatever we do anyway.
636# Just "make" or "make all" shall build modules as well
637
638ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),)
639 KBUILD_MODULES := 1
640endif
641
642ifeq ($(MAKECMDGOALS),)
643 KBUILD_MODULES := 1
644endif
645
646export KBUILD_MODULES KBUILD_BUILTIN
647
648ifdef need-config
649include include/config/auto.conf
650endif
651
652ifeq ($(KBUILD_EXTMOD),)
653# Objects we will link into vmlinux / subdirs we need to visit
654core-y := init/ usr/
655drivers-y := drivers/ sound/
656drivers-$(CONFIG_SAMPLES) += samples/
657drivers-y += net/ virt/
658libs-y := lib/
659endif # KBUILD_EXTMOD
660
661# The all: target is the default when no target is given on the
662# command line.
663# This allow a user to issue only 'make' to build a kernel including modules
664# Defaults to vmlinux, but the arch makefile usually adds further targets
665all: vmlinux
666
667CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
668 $(call cc-option,-fno-tree-loop-im) \
669 $(call cc-disable-warning,maybe-uninitialized,)
670export CFLAGS_GCOV
671
672# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
673ifdef CONFIG_FUNCTION_TRACER
674 CC_FLAGS_FTRACE := -pg
675endif
676
677RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
678RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
679RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
680RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
681RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
682RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
683export RETPOLINE_CFLAGS
684export RETPOLINE_VDSO_CFLAGS
685
686include arch/$(SRCARCH)/Makefile
687
688ifdef need-config
689ifdef may-sync-config
690# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
691# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
692# because some architectures define CROSS_COMPILE there.
693include include/config/auto.conf.cmd
694
695$(KCONFIG_CONFIG):
696 @echo >&2 '***'
697 @echo >&2 '*** Configuration file "$@" not found!'
698 @echo >&2 '***'
699 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
700 @echo >&2 '*** "make menuconfig" or "make xconfig").'
701 @echo >&2 '***'
702 @/bin/false
703
704# The actual configuration files used during the build are stored in
705# include/generated/ and include/config/. Update them if .config is newer than
706# include/config/auto.conf (which mirrors .config).
707#
708# This exploits the 'multi-target pattern rule' trick.
709# The syncconfig should be executed only once to make all the targets.
710# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
711%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
712 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
713else # !may-sync-config
714# External modules and some install targets need include/generated/autoconf.h
715# and include/config/auto.conf but do not care if they are up-to-date.
716# Use auto.conf to trigger the test
717PHONY += include/config/auto.conf
718
719include/config/auto.conf:
720 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
721 echo >&2; \
722 echo >&2 " ERROR: Kernel configuration is invalid."; \
723 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
724 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
725 echo >&2 ; \
726 /bin/false)
727
728endif # may-sync-config
729endif # need-config
730
731KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
732KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
733KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
734KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
735KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
736
737ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
738KBUILD_CFLAGS += -O2
739else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
740KBUILD_CFLAGS += -O3
741else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
742KBUILD_CFLAGS += -Os
743endif
744
745# Tell gcc to never replace conditional load with a non-conditional one
746KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
747KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
748
749ifdef CONFIG_READABLE_ASM
750# Disable optimizations that make assembler listings hard to read.
751# reorder blocks reorders the control in the function
752# ipa clone creates specialized cloned functions
753# partial inlining inlines only parts of functions
754KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
755 $(call cc-option,-fno-ipa-cp-clone,) \
756 $(call cc-option,-fno-partial-inlining)
757endif
758
759ifneq ($(CONFIG_FRAME_WARN),0)
760KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
761endif
762
763stackp-flags-y := -fno-stack-protector
764stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
765stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
766
767KBUILD_CFLAGS += $(stackp-flags-y)
768
769ifdef CONFIG_CC_IS_CLANG
770KBUILD_CPPFLAGS += -Qunused-arguments
771KBUILD_CFLAGS += -Wno-format-invalid-specifier
772KBUILD_CFLAGS += -Wno-gnu
773# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
774# source of a reference will be _MergedGlobals and not on of the whitelisted names.
775# See modpost pattern 2
776KBUILD_CFLAGS += -mno-global-merge
777else
778
779# These warnings generated too much noise in a regular build.
780# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
781KBUILD_CFLAGS += -Wno-unused-but-set-variable
782
783# Warn about unmarked fall-throughs in switch statement.
784# Disabled for clang while comment to attribute conversion happens and
785# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
786KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
787endif
788
789KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
790ifdef CONFIG_FRAME_POINTER
791KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
792else
793# Some targets (ARM with Thumb2, for example), can't be built with frame
794# pointers. For those, we don't have FUNCTION_TRACER automatically
795# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
796# incompatible with -fomit-frame-pointer with current GCC, so we don't use
797# -fomit-frame-pointer with FUNCTION_TRACER.
798ifndef CONFIG_FUNCTION_TRACER
799KBUILD_CFLAGS += -fomit-frame-pointer
800endif
801endif
802
803# Initialize all stack variables with a 0xAA pattern.
804ifdef CONFIG_INIT_STACK_ALL_PATTERN
805KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
806endif
807
808# Initialize all stack variables with a zero value.
809ifdef CONFIG_INIT_STACK_ALL_ZERO
810# Future support for zero initialization is still being debated, see
811# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
812# renamed or dropped.
813KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
814KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
815endif
816
817DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
818
819ifdef CONFIG_DEBUG_INFO
820ifdef CONFIG_DEBUG_INFO_SPLIT
821DEBUG_CFLAGS += -gsplit-dwarf
822else
823DEBUG_CFLAGS += -g
824endif
825KBUILD_AFLAGS += -Wa,-gdwarf-2
826endif
827ifdef CONFIG_DEBUG_INFO_DWARF4
828DEBUG_CFLAGS += -gdwarf-4
829endif
830
831ifdef CONFIG_DEBUG_INFO_REDUCED
832DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
833 $(call cc-option,-fno-var-tracking)
834endif
835
836ifdef CONFIG_DEBUG_INFO_COMPRESSED
837DEBUG_CFLAGS += -gz=zlib
838KBUILD_AFLAGS += -gz=zlib
839KBUILD_LDFLAGS += --compress-debug-sections=zlib
840endif
841
842KBUILD_CFLAGS += $(DEBUG_CFLAGS)
843export DEBUG_CFLAGS
844
845ifdef CONFIG_FUNCTION_TRACER
846ifdef CONFIG_FTRACE_MCOUNT_RECORD
847 # gcc 5 supports generating the mcount tables directly
848 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
849 CC_FLAGS_FTRACE += -mrecord-mcount
850 export CC_USING_RECORD_MCOUNT := 1
851 endif
852 ifdef CONFIG_HAVE_NOP_MCOUNT
853 ifeq ($(call cc-option-yn, -mnop-mcount),y)
854 CC_FLAGS_FTRACE += -mnop-mcount
855 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
856 endif
857 endif
858endif
859ifdef CONFIG_HAVE_FENTRY
860 ifeq ($(call cc-option-yn, -mfentry),y)
861 CC_FLAGS_FTRACE += -mfentry
862 CC_FLAGS_USING += -DCC_USING_FENTRY
863 endif
864endif
865export CC_FLAGS_FTRACE
866KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
867KBUILD_AFLAGS += $(CC_FLAGS_USING)
868ifdef CONFIG_DYNAMIC_FTRACE
869 ifdef CONFIG_HAVE_C_RECORDMCOUNT
870 BUILD_C_RECORDMCOUNT := y
871 export BUILD_C_RECORDMCOUNT
872 endif
873endif
874endif
875
876# We trigger additional mismatches with less inlining
877ifdef CONFIG_DEBUG_SECTION_MISMATCH
878KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
879endif
880
881ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
882KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
883LDFLAGS_vmlinux += --gc-sections
884endif
885
886ifdef CONFIG_LIVEPATCH
887KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
888endif
889
890ifdef CONFIG_SHADOW_CALL_STACK
891CC_FLAGS_SCS := -fsanitize=shadow-call-stack
892KBUILD_CFLAGS += $(CC_FLAGS_SCS)
893export CC_FLAGS_SCS
894endif
895
896ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
897KBUILD_CFLAGS += -falign-functions=32
898endif
899
900# arch Makefile may override CC so keep this after arch Makefile is included
901NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
902
903# warn about C99 declaration after statement
904KBUILD_CFLAGS += -Wdeclaration-after-statement
905
906# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
907KBUILD_CFLAGS += -Wvla
908
909# disable pointer signed / unsigned warnings in gcc 4.0
910KBUILD_CFLAGS += -Wno-pointer-sign
911
912# disable stringop warnings in gcc 8+
913KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
914
915# We'll want to enable this eventually, but it's not going away for 5.7 at least
916KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
917KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
918KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
919
920# Another good warning that we'll want to enable eventually
921KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
922
923# Enabled with W=2, disabled by default as noisy
924KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
925
926# disable invalid "can't wrap" optimizations for signed / pointers
927KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
928
929# clang sets -fmerge-all-constants by default as optimization, but this
930# is non-conforming behavior for C and in fact breaks the kernel, so we
931# need to disable it here generally.
932KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
933
934# for gcc -fno-merge-all-constants disables everything, but it is fine
935# to have actual conforming behavior enabled.
936KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
937
938# Make sure -fstack-check isn't enabled (like gentoo apparently did)
939KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
940
941# conserve stack if available
942KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
943
944# Prohibit date/time macros, which would make the build non-deterministic
945KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
946
947# enforce correct pointer usage
948KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
949
950# Require designated initializers for all marked structures
951KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
952
953# change __FILE__ to the relative path from the srctree
954KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
955
956# ensure -fcf-protection is disabled when using retpoline as it is
957# incompatible with -mindirect-branch=thunk-extern
958ifdef CONFIG_RETPOLINE
959KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
960endif
961
962# include additional Makefiles when needed
963include-y := scripts/Makefile.extrawarn
964include-$(CONFIG_KASAN) += scripts/Makefile.kasan
965include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
966include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
967include-$(CONFIG_KCOV) += scripts/Makefile.kcov
968include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
969
970include $(addprefix $(srctree)/, $(include-y))
971
972# scripts/Makefile.gcc-plugins is intentionally included last.
973# Do not add $(call cc-option,...) below this line. When you build the kernel
974# from the clean source tree, the GCC plugins do not exist at this point.
975
976# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
977KBUILD_CPPFLAGS += $(KCPPFLAGS)
978KBUILD_AFLAGS += $(KAFLAGS)
979KBUILD_CFLAGS += $(KCFLAGS)
980
981KBUILD_LDFLAGS_MODULE += --build-id
982LDFLAGS_vmlinux += --build-id
983
984ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
985LDFLAGS_vmlinux += $(call ld-option, -X,)
986endif
987
988ifeq ($(CONFIG_RELR),y)
989LDFLAGS_vmlinux += --pack-dyn-relocs=relr
990endif
991
992# Align the bit size of userspace programs with the kernel
993KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
994KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
995
996# make the checker run with the right architecture
997CHECKFLAGS += --arch=$(ARCH)
998
999# insure the checker run with the right endianness
1000CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1001
1002# the checker needs the correct machine size
1003CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1004
1005# Default kernel image to build when no specific target is given.
1006# KBUILD_IMAGE may be overruled on the command line or
1007# set in the environment
1008# Also any assignments in arch/$(ARCH)/Makefile take precedence over
1009# this default value
1010export KBUILD_IMAGE ?= vmlinux
1011
1012#
1013# INSTALL_PATH specifies where to place the updated kernel and system map
1014# images. Default is /boot, but you can set it to other values
1015export INSTALL_PATH ?= /boot
1016
1017#
1018# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1019# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1020# an argument if needed. Otherwise it defaults to the kernel install path
1021#
1022export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1023
1024#
1025# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1026# relocations required by build roots. This is not defined in the
1027# makefile but the argument can be passed to make if needed.
1028#
1029
1030MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1031export MODLIB
1032
1033#
1034# INSTALL_MOD_STRIP, if defined, will cause modules to be
1035# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1036# the default option --strip-debug will be used. Otherwise,
1037# INSTALL_MOD_STRIP value will be used as the options to the strip command.
1038
1039ifdef INSTALL_MOD_STRIP
1040ifeq ($(INSTALL_MOD_STRIP),1)
1041mod_strip_cmd = $(STRIP) --strip-debug
1042else
1043mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1044endif # INSTALL_MOD_STRIP=1
1045else
1046mod_strip_cmd = true
1047endif # INSTALL_MOD_STRIP
1048export mod_strip_cmd
1049
1050# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1051# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1052# or CONFIG_MODULE_COMPRESS_XZ.
1053
1054mod_compress_cmd = true
1055ifdef CONFIG_MODULE_COMPRESS
1056 ifdef CONFIG_MODULE_COMPRESS_GZIP
1057 mod_compress_cmd = $(KGZIP) -n -f
1058 endif # CONFIG_MODULE_COMPRESS_GZIP
1059 ifdef CONFIG_MODULE_COMPRESS_XZ
1060 mod_compress_cmd = $(XZ) -f
1061 endif # CONFIG_MODULE_COMPRESS_XZ
1062endif # CONFIG_MODULE_COMPRESS
1063export mod_compress_cmd
1064
1065ifdef CONFIG_MODULE_SIG_ALL
1066$(eval $(call config_filename,MODULE_SIG_KEY))
1067
1068mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1069else
1070mod_sign_cmd = true
1071endif
1072export mod_sign_cmd
1073
1074HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1075
1076has_libelf = $(call try-run,\
1077 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1078
1079ifdef CONFIG_STACK_VALIDATION
1080 ifeq ($(has_libelf),1)
1081 objtool_target := tools/objtool FORCE
1082 else
1083 SKIP_STACK_VALIDATION := 1
1084 export SKIP_STACK_VALIDATION
1085 endif
1086endif
1087
1088ifdef CONFIG_DEBUG_INFO_BTF
1089 ifeq ($(has_libelf),1)
1090 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1091 else
1092 ERROR_RESOLVE_BTFIDS := 1
1093 endif
1094endif
1095
1096PHONY += prepare0
1097
1098export MODORDER := $(extmod-prefix)modules.order
1099export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1100
1101ifeq ($(KBUILD_EXTMOD),)
1102core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1103
1104vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1105 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1106 $(libs-y) $(libs-m)))
1107
1108vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1109 $(patsubst %/,%,$(filter %/, $(core-) \
1110 $(drivers-) $(libs-))))
1111
1112subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1113 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1114 $(drivers-y) $(drivers-m)))
1115
1116build-dirs := $(vmlinux-dirs)
1117clean-dirs := $(vmlinux-alldirs)
1118
1119# Externally visible symbols (used by link-vmlinux.sh)
1120KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1121KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1122ifdef CONFIG_MODULES
1123KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1124KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1125else
1126KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1127endif
1128KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1129
1130export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1131export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1132# used by scripts/Makefile.package
1133export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1134
1135vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1136
1137# Recurse until adjust_autoksyms.sh is satisfied
1138PHONY += autoksyms_recursive
1139ifdef CONFIG_TRIM_UNUSED_KSYMS
1140# For the kernel to actually contain only the needed exported symbols,
1141# we have to build modules as well to determine what those symbols are.
1142# (this can be evaluated only once include/config/auto.conf has been included)
1143KBUILD_MODULES := 1
1144
1145autoksyms_recursive: descend modules.order
1146 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1147 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1148endif
1149
1150autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1151
1152quiet_cmd_autoksyms_h = GEN $@
1153 cmd_autoksyms_h = mkdir -p $(dir $@); \
1154 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1155
1156$(autoksyms_h):
1157 $(call cmd,autoksyms_h)
1158
1159ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1160
1161# Final link of vmlinux with optional arch pass after final link
1162cmd_link-vmlinux = \
1163 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1164 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1165
1166vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1167 +$(call if_changed,link-vmlinux)
1168
1169targets := vmlinux
1170
1171# The actual objects are generated when descending,
1172# make sure no implicit rule kicks in
1173$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1174
1175filechk_kernel.release = \
1176 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1177
1178# Store (new) KERNELRELEASE string in include/config/kernel.release
1179include/config/kernel.release: FORCE
1180 $(call filechk,kernel.release)
1181
1182# Additional helpers built in scripts/
1183# Carefully list dependencies so we do not try to build scripts twice
1184# in parallel
1185PHONY += scripts
1186scripts: scripts_basic scripts_dtc
1187 $(Q)$(MAKE) $(build)=$(@)
1188
1189# Things we need to do before we recursively start building the kernel
1190# or the modules are listed in "prepare".
1191# A multi level approach is used. prepareN is processed before prepareN-1.
1192# archprepare is used in arch Makefiles and when processed asm symlink,
1193# version.h and scripts_basic is processed / created.
1194
1195PHONY += prepare archprepare
1196
1197archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1198 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1199 include/generated/autoconf.h
1200
1201prepare0: archprepare
1202 $(Q)$(MAKE) $(build)=scripts/mod
1203 $(Q)$(MAKE) $(build)=.
1204
1205# All the preparing..
1206prepare: prepare0 prepare-objtool prepare-resolve_btfids
1207
1208# Support for using generic headers in asm-generic
1209asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1210
1211PHONY += asm-generic uapi-asm-generic
1212asm-generic: uapi-asm-generic
1213 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1214 generic=include/asm-generic
1215uapi-asm-generic:
1216 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1217 generic=include/uapi/asm-generic
1218
1219PHONY += prepare-objtool prepare-resolve_btfids
1220prepare-objtool: $(objtool_target)
1221ifeq ($(SKIP_STACK_VALIDATION),1)
1222ifdef CONFIG_UNWINDER_ORC
1223 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1224 @false
1225else
1226 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1227endif
1228endif
1229
1230prepare-resolve_btfids: $(resolve_btfids_target)
1231ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1232 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1233 @false
1234endif
1235# Generate some files
1236# ---------------------------------------------------------------------------
1237
1238# KERNELRELEASE can change from a few different places, meaning version.h
1239# needs to be updated, so this check is forced on all builds
1240
1241uts_len := 64
1242define filechk_utsrelease.h
1243 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1244 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1245 exit 1; \
1246 fi; \
1247 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1248endef
1249
1250define filechk_version.h
1251 echo \#define LINUX_VERSION_CODE $(shell \
1252 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1253 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1254endef
1255
1256$(version_h): FORCE
1257 $(call filechk,version.h)
1258 $(Q)rm -f $(old_version_h)
1259
1260include/generated/utsrelease.h: include/config/kernel.release FORCE
1261 $(call filechk,utsrelease.h)
1262
1263PHONY += headerdep
1264headerdep:
1265 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1266 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1267
1268# ---------------------------------------------------------------------------
1269# Kernel headers
1270
1271#Default location for installed headers
1272export INSTALL_HDR_PATH = $(objtree)/usr
1273
1274quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1275 cmd_headers_install = \
1276 mkdir -p $(INSTALL_HDR_PATH); \
1277 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1278 usr/include $(INSTALL_HDR_PATH)
1279
1280PHONY += headers_install
1281headers_install: headers
1282 $(call cmd,headers_install)
1283
1284PHONY += archheaders archscripts
1285
1286hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1287
1288PHONY += headers
1289headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1290 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1291 $(error Headers not exportable for the $(SRCARCH) architecture))
1292 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1293 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1294
1295# Deprecated. It is no-op now.
1296PHONY += headers_check
1297headers_check:
1298 @:
1299
1300ifdef CONFIG_HEADERS_INSTALL
1301prepare: headers
1302endif
1303
1304PHONY += scripts_unifdef
1305scripts_unifdef: scripts_basic
1306 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1307
1308# ---------------------------------------------------------------------------
1309# Kernel selftest
1310
1311PHONY += kselftest
1312kselftest:
1313 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1314
1315kselftest-%: FORCE
1316 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1317
1318PHONY += kselftest-merge
1319kselftest-merge:
1320 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1321 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1322 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1323 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1324
1325# ---------------------------------------------------------------------------
1326# Devicetree files
1327
1328ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1329dtstree := arch/$(SRCARCH)/boot/dts
1330endif
1331
1332ifneq ($(dtstree),)
1333
1334%.dtb: include/config/kernel.release scripts_dtc
1335 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1336
1337PHONY += dtbs dtbs_install dtbs_check
1338dtbs: include/config/kernel.release scripts_dtc
1339 $(Q)$(MAKE) $(build)=$(dtstree)
1340
1341ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1342export CHECK_DTBS=y
1343dtbs: dt_binding_check
1344endif
1345
1346dtbs_check: dtbs
1347
1348dtbs_install:
1349 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1350
1351ifdef CONFIG_OF_EARLY_FLATTREE
1352all: dtbs
1353endif
1354
1355endif
1356
1357PHONY += scripts_dtc
1358scripts_dtc: scripts_basic
1359 $(Q)$(MAKE) $(build)=scripts/dtc
1360
1361ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1362export CHECK_DT_BINDING=y
1363endif
1364
1365PHONY += dt_binding_check
1366dt_binding_check: scripts_dtc
1367 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1368
1369# ---------------------------------------------------------------------------
1370# Modules
1371
1372ifdef CONFIG_MODULES
1373
1374# By default, build modules as well
1375
1376all: modules
1377
1378# When we're building modules with modversions, we need to consider
1379# the built-in objects during the descend as well, in order to
1380# make sure the checksums are up to date before we record them.
1381ifdef CONFIG_MODVERSIONS
1382 KBUILD_BUILTIN := 1
1383endif
1384
1385# Build modules
1386#
1387# A module can be listed more than once in obj-m resulting in
1388# duplicate lines in modules.order files. Those are removed
1389# using awk while concatenating to the final file.
1390
1391PHONY += modules
1392modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
1393 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1394
1395PHONY += modules_check
1396modules_check: modules.order
1397 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1398
1399cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1400
1401modules.order: $(subdir-modorder) FORCE
1402 $(call if_changed,modules_order)
1403
1404targets += modules.order
1405
1406# Target to prepare building external modules
1407PHONY += modules_prepare
1408modules_prepare: prepare
1409
1410# Target to install modules
1411PHONY += modules_install
1412modules_install: _modinst_ _modinst_post
1413
1414PHONY += _modinst_
1415_modinst_:
1416 @rm -rf $(MODLIB)/kernel
1417 @rm -f $(MODLIB)/source
1418 @mkdir -p $(MODLIB)/kernel
1419 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1420 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1421 rm -f $(MODLIB)/build ; \
1422 ln -s $(CURDIR) $(MODLIB)/build ; \
1423 fi
1424 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1425 @cp -f modules.builtin $(MODLIB)/
1426 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1427 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1428
1429# This depmod is only for convenience to give the initial
1430# boot a modules.dep even before / is mounted read-write. However the
1431# boot script depmod is the master version.
1432PHONY += _modinst_post
1433_modinst_post: _modinst_
1434 $(call cmd,depmod)
1435
1436ifeq ($(CONFIG_MODULE_SIG), y)
1437PHONY += modules_sign
1438modules_sign:
1439 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1440endif
1441
1442else # CONFIG_MODULES
1443
1444# Modules not configured
1445# ---------------------------------------------------------------------------
1446
1447PHONY += modules modules_install
1448modules modules_install:
1449 @echo >&2
1450 @echo >&2 "The present kernel configuration has modules disabled."
1451 @echo >&2 "Type 'make config' and enable loadable module support."
1452 @echo >&2 "Then build a kernel with module support enabled."
1453 @echo >&2
1454 @exit 1
1455
1456endif # CONFIG_MODULES
1457
1458###
1459# Cleaning is done on three levels.
1460# make clean Delete most generated files
1461# Leave enough to build external modules
1462# make mrproper Delete the current configuration, and all generated files
1463# make distclean Remove editor backup files, patch leftover files and the like
1464
1465# Directories & files removed with 'make clean'
1466CLEAN_FILES += include/ksym vmlinux.symvers \
1467 modules.builtin modules.builtin.modinfo modules.nsdeps
1468
1469# Directories & files removed with 'make mrproper'
1470MRPROPER_FILES += include/config include/generated \
1471 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1472 debian snap tar-install \
1473 .config .config.old .version \
1474 Module.symvers \
1475 signing_key.pem signing_key.priv signing_key.x509 \
1476 x509.genkey extra_certificates signing_key.x509.keyid \
1477 signing_key.x509.signer vmlinux-gdb.py \
1478 *.spec
1479
1480# Directories & files removed with 'make distclean'
1481DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1482
1483# clean - Delete most, but leave enough to build external modules
1484#
1485clean: rm-files := $(CLEAN_FILES)
1486
1487PHONY += archclean vmlinuxclean
1488
1489vmlinuxclean:
1490 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1491 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1492
1493clean: archclean vmlinuxclean
1494
1495# mrproper - Delete all generated files, including .config
1496#
1497mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1498mrproper-dirs := $(addprefix _mrproper_,scripts)
1499
1500PHONY += $(mrproper-dirs) mrproper
1501$(mrproper-dirs):
1502 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1503
1504mrproper: clean $(mrproper-dirs)
1505 $(call cmd,rmfiles)
1506
1507# distclean
1508#
1509distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1510
1511PHONY += distclean
1512
1513distclean: mrproper
1514 $(call cmd,rmfiles)
1515 @find $(srctree) $(RCS_FIND_IGNORE) \
1516 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1517 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1518 -o -name 'core' \) \
1519 -type f -print | xargs rm -f
1520
1521
1522# Packaging of the kernel to various formats
1523# ---------------------------------------------------------------------------
1524
1525%src-pkg: FORCE
1526 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1527%pkg: include/config/kernel.release FORCE
1528 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1529
1530# Brief documentation of the typical targets used
1531# ---------------------------------------------------------------------------
1532
1533boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1534boards := $(sort $(notdir $(boards)))
1535board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1536board-dirs := $(sort $(notdir $(board-dirs:/=)))
1537
1538PHONY += help
1539help:
1540 @echo 'Cleaning targets:'
1541 @echo ' clean - Remove most generated files but keep the config and'
1542 @echo ' enough build support to build external modules'
1543 @echo ' mrproper - Remove all generated files + config + various backup files'
1544 @echo ' distclean - mrproper + remove editor backup and patch files'
1545 @echo ''
1546 @echo 'Configuration targets:'
1547 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1548 @echo ''
1549 @echo 'Other generic targets:'
1550 @echo ' all - Build all targets marked with [*]'
1551 @echo '* vmlinux - Build the bare kernel'
1552 @echo '* modules - Build all modules'
1553 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1554 @echo ' dir/ - Build all files in dir and below'
1555 @echo ' dir/file.[ois] - Build specified target only'
1556 @echo ' dir/file.ll - Build the LLVM assembly file'
1557 @echo ' (requires compiler support for LLVM assembly generation)'
1558 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1559 @echo ' (requires a recent binutils and recent build (System.map))'
1560 @echo ' dir/file.ko - Build module including final link'
1561 @echo ' modules_prepare - Set up for building external modules'
1562 @echo ' tags/TAGS - Generate tags file for editors'
1563 @echo ' cscope - Generate cscope index'
1564 @echo ' gtags - Generate GNU GLOBAL index'
1565 @echo ' kernelrelease - Output the release version string (use with make -s)'
1566 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1567 @echo ' image_name - Output the image name (use with make -s)'
1568 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1569 echo ' (default: $(INSTALL_HDR_PATH))'; \
1570 echo ''
1571 @echo 'Static analysers:'
1572 @echo ' checkstack - Generate a list of stack hogs'
1573 @echo ' namespacecheck - Name space analysis on compiled kernel'
1574 @echo ' versioncheck - Sanity check on version.h usage'
1575 @echo ' includecheck - Check for duplicate included header files'
1576 @echo ' export_report - List the usages of all exported symbols'
1577 @echo ' headerdep - Detect inclusion cycles in headers'
1578 @echo ' coccicheck - Check with Coccinelle'
1579 @echo ''
1580 @echo 'Tools:'
1581 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1582 @echo ''
1583 @echo 'Kernel selftest:'
1584 @echo ' kselftest - Build and run kernel selftest'
1585 @echo ' Build, install, and boot kernel before'
1586 @echo ' running kselftest on it'
1587 @echo ' Run as root for full coverage'
1588 @echo ' kselftest-all - Build kernel selftest'
1589 @echo ' kselftest-install - Build and install kernel selftest'
1590 @echo ' kselftest-clean - Remove all generated kselftest files'
1591 @echo ' kselftest-merge - Merge all the config dependencies of'
1592 @echo ' kselftest to existing .config.'
1593 @echo ''
1594 @$(if $(dtstree), \
1595 echo 'Devicetree:'; \
1596 echo '* dtbs - Build device tree blobs for enabled boards'; \
1597 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1598 echo ' dt_binding_check - Validate device tree binding documents'; \
1599 echo ' dtbs_check - Validate device tree source files';\
1600 echo '')
1601
1602 @echo 'Userspace tools targets:'
1603 @echo ' use "make tools/help"'
1604 @echo ' or "cd tools; make help"'
1605 @echo ''
1606 @echo 'Kernel packaging:'
1607 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1608 @echo ''
1609 @echo 'Documentation targets:'
1610 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1611 @echo ''
1612 @echo 'Architecture specific targets ($(SRCARCH)):'
1613 @$(if $(archhelp),$(archhelp),\
1614 echo ' No architecture specific help defined for $(SRCARCH)')
1615 @echo ''
1616 @$(if $(boards), \
1617 $(foreach b, $(boards), \
1618 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1619 echo '')
1620 @$(if $(board-dirs), \
1621 $(foreach b, $(board-dirs), \
1622 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1623 printf " %-16s - Show all of the above\\n" help-boards; \
1624 echo '')
1625
1626 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1627 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1628 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1629 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1630 @echo ' (sparse by default)'
1631 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1632 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1633 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1634 @echo ' 1: warnings which may be relevant and do not occur too often'
1635 @echo ' 2: warnings which occur quite often but may still be relevant'
1636 @echo ' 3: more obscure warnings, can most likely be ignored'
1637 @echo ' Multiple levels can be combined with W=12 or W=123'
1638 @echo ''
1639 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1640 @echo 'For further info see the ./README file'
1641
1642
1643help-board-dirs := $(addprefix help-,$(board-dirs))
1644
1645help-boards: $(help-board-dirs)
1646
1647boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1648
1649$(help-board-dirs): help-%:
1650 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1651 @$(if $(boards-per-dir), \
1652 $(foreach b, $(boards-per-dir), \
1653 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1654 echo '')
1655
1656
1657# Documentation targets
1658# ---------------------------------------------------------------------------
1659DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1660 linkcheckdocs dochelp refcheckdocs
1661PHONY += $(DOC_TARGETS)
1662$(DOC_TARGETS):
1663 $(Q)$(MAKE) $(build)=Documentation $@
1664
1665# Misc
1666# ---------------------------------------------------------------------------
1667
1668PHONY += scripts_gdb
1669scripts_gdb: prepare0
1670 $(Q)$(MAKE) $(build)=scripts/gdb
1671 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1672
1673ifdef CONFIG_GDB_SCRIPTS
1674all: scripts_gdb
1675endif
1676
1677else # KBUILD_EXTMOD
1678
1679###
1680# External module support.
1681# When building external modules the kernel used as basis is considered
1682# read-only, and no consistency checks are made and the make
1683# system is not used on the basis kernel. If updates are required
1684# in the basis kernel ordinary make commands (without M=...) must
1685# be used.
1686#
1687# The following are the only valid targets when building external
1688# modules.
1689# make M=dir clean Delete all automatically generated files
1690# make M=dir modules Make all modules in specified dir
1691# make M=dir Same as 'make M=dir modules'
1692# make M=dir modules_install
1693# Install the modules built in the module directory
1694# Assumes install directory is already created
1695
1696# We are always building modules
1697KBUILD_MODULES := 1
1698
1699build-dirs := $(KBUILD_EXTMOD)
1700PHONY += modules
1701modules: descend
1702 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1703
1704PHONY += modules_install
1705modules_install: _emodinst_ _emodinst_post
1706
1707install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1708PHONY += _emodinst_
1709_emodinst_:
1710 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1711 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1712
1713PHONY += _emodinst_post
1714_emodinst_post: _emodinst_
1715 $(call cmd,depmod)
1716
1717clean-dirs := $(KBUILD_EXTMOD)
1718clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1719
1720PHONY += help
1721help:
1722 @echo ' Building external modules.'
1723 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1724 @echo ''
1725 @echo ' modules - default target, build the module(s)'
1726 @echo ' modules_install - install the module'
1727 @echo ' clean - remove generated files in module directory only'
1728 @echo ''
1729
1730PHONY += prepare
1731endif # KBUILD_EXTMOD
1732
1733# Single targets
1734# ---------------------------------------------------------------------------
1735# To build individual files in subdirectories, you can do like this:
1736#
1737# make foo/bar/baz.s
1738#
1739# The supported suffixes for single-target are listed in 'single-targets'
1740#
1741# To build only under specific subdirectories, you can do like this:
1742#
1743# make foo/bar/baz/
1744
1745ifdef single-build
1746
1747# .ko is special because modpost is needed
1748single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1749single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1750
1751$(single-ko): single_modpost
1752 @:
1753$(single-no-ko): descend
1754 @:
1755
1756ifeq ($(KBUILD_EXTMOD),)
1757# For the single build of in-tree modules, use a temporary file to avoid
1758# the situation of modules_install installing an invalid modules.order.
1759MODORDER := .modules.tmp
1760endif
1761
1762PHONY += single_modpost
1763single_modpost: $(single-no-ko)
1764 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1765 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1766
1767KBUILD_MODULES := 1
1768
1769export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1770
1771# trim unrelated directories
1772build-dirs := $(foreach d, $(build-dirs), \
1773 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1774
1775endif
1776
1777ifndef CONFIG_MODULES
1778KBUILD_MODULES :=
1779endif
1780
1781# Handle descending into subdirectories listed in $(build-dirs)
1782# Preset locale variables to speed up the build process. Limit locale
1783# tweaks to this spot to avoid wrong language settings when running
1784# make menuconfig etc.
1785# Error messages still appears in the original language
1786PHONY += descend $(build-dirs)
1787descend: $(build-dirs)
1788$(build-dirs): prepare
1789 $(Q)$(MAKE) $(build)=$@ \
1790 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1791 need-builtin=1 need-modorder=1
1792
1793clean-dirs := $(addprefix _clean_, $(clean-dirs))
1794PHONY += $(clean-dirs) clean
1795$(clean-dirs):
1796 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1797
1798clean: $(clean-dirs)
1799 $(call cmd,rmfiles)
1800 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1801 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1802 -o -name '*.ko.*' \
1803 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1804 -o -name '*.dwo' -o -name '*.lst' \
1805 -o -name '*.su' -o -name '*.mod' \
1806 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1807 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1808 -o -name '*.asn1.[ch]' \
1809 -o -name '*.symtypes' -o -name 'modules.order' \
1810 -o -name '.tmp_*.o.*' \
1811 -o -name '*.c.[012]*.*' \
1812 -o -name '*.ll' \
1813 -o -name '*.gcno' \) -type f -print | xargs rm -f
1814
1815# Generate tags for editors
1816# ---------------------------------------------------------------------------
1817quiet_cmd_tags = GEN $@
1818 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1819
1820tags TAGS cscope gtags: FORCE
1821 $(call cmd,tags)
1822
1823# Script to generate missing namespace dependencies
1824# ---------------------------------------------------------------------------
1825
1826PHONY += nsdeps
1827nsdeps: export KBUILD_NSDEPS=1
1828nsdeps: modules
1829 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1830
1831# Scripts to check various things for consistency
1832# ---------------------------------------------------------------------------
1833
1834PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1835
1836includecheck:
1837 find $(srctree)/* $(RCS_FIND_IGNORE) \
1838 -name '*.[hcS]' -type f -print | sort \
1839 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1840
1841versioncheck:
1842 find $(srctree)/* $(RCS_FIND_IGNORE) \
1843 -name '*.[hcS]' -type f -print | sort \
1844 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1845
1846coccicheck:
1847 $(Q)$(BASH) $(srctree)/scripts/$@
1848
1849namespacecheck:
1850 $(PERL) $(srctree)/scripts/namespace.pl
1851
1852export_report:
1853 $(PERL) $(srctree)/scripts/export_report.pl
1854
1855PHONY += checkstack kernelrelease kernelversion image_name
1856
1857# UML needs a little special treatment here. It wants to use the host
1858# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1859# else wants $(ARCH), including people doing cross-builds, which means
1860# that $(SUBARCH) doesn't work here.
1861ifeq ($(ARCH), um)
1862CHECKSTACK_ARCH := $(SUBARCH)
1863else
1864CHECKSTACK_ARCH := $(ARCH)
1865endif
1866checkstack:
1867 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1868 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1869
1870kernelrelease:
1871 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1872
1873kernelversion:
1874 @echo $(KERNELVERSION)
1875
1876image_name:
1877 @echo $(KBUILD_IMAGE)
1878
1879# Clear a bunch of variables before executing the submake
1880
1881ifeq ($(quiet),silent_)
1882tools_silent=s
1883endif
1884
1885tools/: FORCE
1886 $(Q)mkdir -p $(objtree)/tools
1887 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1888
1889tools/%: FORCE
1890 $(Q)mkdir -p $(objtree)/tools
1891 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1892
1893quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1894 cmd_rmfiles = rm -rf $(rm-files)
1895
1896# Run depmod only if we have System.map and depmod is executable
1897quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1898 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1899 $(KERNELRELEASE)
1900
1901# read saved command lines for existing targets
1902existing-targets := $(wildcard $(sort $(targets)))
1903
1904-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1905
1906endif # config-build
1907endif # mixed-build
1908endif # need-sub-make
1909
1910PHONY += FORCE
1911FORCE:
1912
1913# Declare the contents of the PHONY variable as phony. We keep that
1914# information in a variable so we can use it in if_changed and friends.
1915.PHONY: $(PHONY)