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 = 11
4SUBLEVEL = 0
5EXTRAVERSION =
6NAME = 💕 Valentine's Day Edition 💕
7
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
14$(if $(filter __%, $(MAKECMDGOALS)), \
15 $(error targets prefixed with '__' are only for internal use))
16
17# That's our default target when none is given on the command line
18PHONY := __all
19__all:
20
21# We are using a recursive build, so we need to do a little thinking
22# to get the ordering right.
23#
24# Most importantly: sub-Makefiles should only ever modify files in
25# their own directory. If in some directory we have a dependency on
26# a file in another dir (which doesn't happen often, but it's often
27# unavoidable when linking the built-in.a targets which finally
28# turn into vmlinux), we will call a sub make in that other dir, and
29# after that we are sure that everything which is in that other dir
30# is now up to date.
31#
32# The only cases where we need to modify files which have global
33# effects are thus separated out and done before the recursive
34# descending is started. They are now explicitly listed as the
35# prepare rule.
36
37ifneq ($(sub_make_done),1)
38
39# Do not use make's built-in rules and variables
40# (this increases performance and avoids hard-to-debug behaviour)
41MAKEFLAGS += -rR
42
43# Avoid funny character set dependencies
44unexport LC_ALL
45LC_COLLATE=C
46LC_NUMERIC=C
47export LC_COLLATE LC_NUMERIC
48
49# Avoid interference with shell env settings
50unexport GREP_OPTIONS
51
52# Beautify output
53# ---------------------------------------------------------------------------
54#
55# Normally, we echo the whole command before executing it. By making
56# that echo $($(quiet)$(cmd)), we now have the possibility to set
57# $(quiet) to choose other forms of output instead, e.g.
58#
59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
61#
62# If $(quiet) is empty, the whole command will be printed.
63# If it is set to "quiet_", only the short version will be printed.
64# If it is set to "silent_", nothing will be printed at all, since
65# the variable $(silent_cmd_cc_o_c) doesn't exist.
66#
67# A simple variant is to prefix commands with $(Q) - that's useful
68# for commands that shall be hidden in non-verbose mode.
69#
70# $(Q)ln $@ :<
71#
72# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73# If KBUILD_VERBOSE equals 1 then the above command is displayed.
74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
75#
76# To put more focus on warnings, be less verbose as default
77# Use 'make V=1' to see the full commands
78
79ifeq ("$(origin V)", "command line")
80 KBUILD_VERBOSE = $(V)
81endif
82ifndef KBUILD_VERBOSE
83 KBUILD_VERBOSE = 0
84endif
85
86ifeq ($(KBUILD_VERBOSE),1)
87 quiet =
88 Q =
89else
90 quiet=quiet_
91 Q = @
92endif
93
94# If the user is running make -s (silent mode), suppress echoing of
95# commands
96
97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
98 quiet=silent_
99endif
100
101export quiet Q KBUILD_VERBOSE
102
103# Kbuild will save output files in the current working directory.
104# This does not need to match to the root of the kernel source tree.
105#
106# For example, you can do this:
107#
108# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
109#
110# If you want to save output files in a different location, there are
111# two syntaxes to specify it.
112#
113# 1) O=
114# Use "make O=dir/to/store/output/files/"
115#
116# 2) Set KBUILD_OUTPUT
117# Set the environment variable KBUILD_OUTPUT to point to the output directory.
118# export KBUILD_OUTPUT=dir/to/store/output/files/; make
119#
120# The O= assignment takes precedence over the KBUILD_OUTPUT environment
121# variable.
122
123# Do we want to change the working directory?
124ifeq ("$(origin O)", "command line")
125 KBUILD_OUTPUT := $(O)
126endif
127
128ifneq ($(KBUILD_OUTPUT),)
129# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
130# expand a shell special character '~'. We use a somewhat tedious way here.
131abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
132$(if $(abs_objtree),, \
133 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
134
135# $(realpath ...) resolves symlinks
136abs_objtree := $(realpath $(abs_objtree))
137else
138abs_objtree := $(CURDIR)
139endif # ifneq ($(KBUILD_OUTPUT),)
140
141ifeq ($(abs_objtree),$(CURDIR))
142# Suppress "Entering directory ..." unless we are changing the work directory.
143MAKEFLAGS += --no-print-directory
144else
145need-sub-make := 1
146endif
147
148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
149
150ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
151$(error source directory cannot contain spaces or colons)
152endif
153
154ifneq ($(abs_srctree),$(abs_objtree))
155# Look for make include files relative to root of kernel src
156#
157# This does not become effective immediately because MAKEFLAGS is re-parsed
158# once after the Makefile is read. We need to invoke sub-make.
159MAKEFLAGS += --include-dir=$(abs_srctree)
160need-sub-make := 1
161endif
162
163this-makefile := $(lastword $(MAKEFILE_LIST))
164
165ifneq ($(filter 3.%,$(MAKE_VERSION)),)
166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
167# We need to invoke sub-make to avoid implicit rules in the top Makefile.
168need-sub-make := 1
169# Cancel implicit rules for this Makefile.
170$(this-makefile): ;
171endif
172
173export abs_srctree abs_objtree
174export sub_make_done := 1
175
176ifeq ($(need-sub-make),1)
177
178PHONY += $(MAKECMDGOALS) __sub-make
179
180$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
181 @:
182
183# Invoke a second make in the output directory, passing relevant variables
184__sub-make:
185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
186
187endif # need-sub-make
188endif # sub_make_done
189
190# We process the rest of the Makefile if this is the final invocation of make
191ifeq ($(need-sub-make),)
192
193# Do not print "Entering directory ...",
194# but we want to display it when entering to the output directory
195# so that IDEs/editors are able to understand relative filenames.
196MAKEFLAGS += --no-print-directory
197
198# Call a source code checker (by default, "sparse") as part of the
199# C compilation.
200#
201# Use 'make C=1' to enable checking of only re-compiled files.
202# Use 'make C=2' to enable checking of *all* source files, regardless
203# of whether they are re-compiled or not.
204#
205# See the file "Documentation/dev-tools/sparse.rst" for more details,
206# including where to get the "sparse" utility.
207
208ifeq ("$(origin C)", "command line")
209 KBUILD_CHECKSRC = $(C)
210endif
211ifndef KBUILD_CHECKSRC
212 KBUILD_CHECKSRC = 0
213endif
214
215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
216# directory of external module to build. Setting M= takes precedence.
217ifeq ("$(origin M)", "command line")
218 KBUILD_EXTMOD := $(M)
219endif
220
221$(if $(word 2, $(KBUILD_EXTMOD)), \
222 $(error building multiple external modules is not supported))
223
224export KBUILD_CHECKSRC KBUILD_EXTMOD
225
226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
227
228ifeq ($(abs_srctree),$(abs_objtree))
229 # building in the source tree
230 srctree := .
231 building_out_of_srctree :=
232else
233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
234 # building in a subdirectory of the source tree
235 srctree := ..
236 else
237 srctree := $(abs_srctree)
238 endif
239 building_out_of_srctree := 1
240endif
241
242ifneq ($(KBUILD_ABS_SRCTREE),)
243srctree := $(abs_srctree)
244endif
245
246objtree := .
247VPATH := $(srctree)
248
249export building_out_of_srctree srctree objtree VPATH
250
251# To make sure we do not include .config for any of the *config targets
252# catch them early, and hand them over to scripts/kconfig/Makefile
253# It is allowed to specify more targets when calling make, including
254# mixing *config targets and build targets.
255# For example 'make oldconfig all'.
256# Detect when mixed targets is specified, and make a second invocation
257# of make so .config is not included in this case either (for *config).
258
259version_h := include/generated/uapi/linux/version.h
260old_version_h := include/linux/version.h
261
262clean-targets := %clean mrproper cleandocs
263no-dot-config-targets := $(clean-targets) \
264 cscope gtags TAGS tags help% %docs check% coccicheck \
265 $(version_h) headers headers_% archheaders archscripts \
266 %asm-generic kernelversion %src-pkg dt_binding_check \
267 outputmakefile
268no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease
269single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
270
271config-build :=
272mixed-build :=
273need-config := 1
274may-sync-config := 1
275single-build :=
276
277ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
278 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
279 need-config :=
280 endif
281endif
282
283ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
284 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
285 may-sync-config :=
286 endif
287endif
288
289ifneq ($(KBUILD_EXTMOD),)
290 may-sync-config :=
291endif
292
293ifeq ($(KBUILD_EXTMOD),)
294 ifneq ($(filter %config,$(MAKECMDGOALS)),)
295 config-build := 1
296 ifneq ($(words $(MAKECMDGOALS)),1)
297 mixed-build := 1
298 endif
299 endif
300endif
301
302# We cannot build single targets and the others at the same time
303ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
304 single-build := 1
305 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
306 mixed-build := 1
307 endif
308endif
309
310# For "make -j clean all", "make -j mrproper defconfig all", etc.
311ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
312 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
313 mixed-build := 1
314 endif
315endif
316
317# install and modules_install need also be processed one by one
318ifneq ($(filter install,$(MAKECMDGOALS)),)
319 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
320 mixed-build := 1
321 endif
322endif
323
324ifdef mixed-build
325# ===========================================================================
326# We're called with mixed targets (*config and build targets).
327# Handle them one by one.
328
329PHONY += $(MAKECMDGOALS) __build_one_by_one
330
331$(MAKECMDGOALS): __build_one_by_one
332 @:
333
334__build_one_by_one:
335 $(Q)set -e; \
336 for i in $(MAKECMDGOALS); do \
337 $(MAKE) -f $(srctree)/Makefile $$i; \
338 done
339
340else # !mixed-build
341
342include scripts/Kbuild.include
343
344# Read KERNELRELEASE from include/config/kernel.release (if it exists)
345KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
346KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
347export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
348
349include scripts/subarch.include
350
351# Cross compiling and selecting different set of gcc/bin-utils
352# ---------------------------------------------------------------------------
353#
354# When performing cross compilation for other architectures ARCH shall be set
355# to the target architecture. (See arch/* for the possibilities).
356# ARCH can be set during invocation of make:
357# make ARCH=ia64
358# Another way is to have ARCH set in the environment.
359# The default ARCH is the host where make is executed.
360
361# CROSS_COMPILE specify the prefix used for all executables used
362# during compilation. Only gcc and related bin-utils executables
363# are prefixed with $(CROSS_COMPILE).
364# CROSS_COMPILE can be set on the command line
365# make CROSS_COMPILE=ia64-linux-
366# Alternatively CROSS_COMPILE can be set in the environment.
367# Default value for CROSS_COMPILE is not to prefix executables
368# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
369ARCH ?= $(SUBARCH)
370
371# Architecture as present in compile.h
372UTS_MACHINE := $(ARCH)
373SRCARCH := $(ARCH)
374
375# Additional ARCH settings for x86
376ifeq ($(ARCH),i386)
377 SRCARCH := x86
378endif
379ifeq ($(ARCH),x86_64)
380 SRCARCH := x86
381endif
382
383# Additional ARCH settings for sparc
384ifeq ($(ARCH),sparc32)
385 SRCARCH := sparc
386endif
387ifeq ($(ARCH),sparc64)
388 SRCARCH := sparc
389endif
390
391# Additional ARCH settings for sh
392ifeq ($(ARCH),sh64)
393 SRCARCH := sh
394endif
395
396KCONFIG_CONFIG ?= .config
397export KCONFIG_CONFIG
398
399# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
400export KBUILD_DEFCONFIG := defconfig
401
402# SHELL used by kbuild
403CONFIG_SHELL := sh
404
405HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
406HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
407HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
408
409ifneq ($(LLVM),)
410HOSTCC = clang
411HOSTCXX = clang++
412else
413HOSTCC = gcc
414HOSTCXX = g++
415endif
416
417export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
418 -O2 -fomit-frame-pointer -std=gnu89
419export KBUILD_USERLDFLAGS :=
420
421KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
422KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
423KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
424KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
425
426# Make variables (CC, etc...)
427CPP = $(CC) -E
428ifneq ($(LLVM),)
429CC = clang
430LD = ld.lld
431AR = llvm-ar
432NM = llvm-nm
433OBJCOPY = llvm-objcopy
434OBJDUMP = llvm-objdump
435READELF = llvm-readelf
436STRIP = llvm-strip
437else
438CC = $(CROSS_COMPILE)gcc
439LD = $(CROSS_COMPILE)ld
440AR = $(CROSS_COMPILE)ar
441NM = $(CROSS_COMPILE)nm
442OBJCOPY = $(CROSS_COMPILE)objcopy
443OBJDUMP = $(CROSS_COMPILE)objdump
444READELF = $(CROSS_COMPILE)readelf
445STRIP = $(CROSS_COMPILE)strip
446endif
447PAHOLE = pahole
448RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
449LEX = flex
450YACC = bison
451AWK = awk
452INSTALLKERNEL := installkernel
453DEPMOD = depmod
454PERL = perl
455PYTHON3 = python3
456CHECK = sparse
457BASH = bash
458KGZIP = gzip
459KBZIP2 = bzip2
460KLZOP = lzop
461LZMA = lzma
462LZ4 = lz4c
463XZ = xz
464ZSTD = zstd
465
466CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
467 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
468NOSTDINC_FLAGS :=
469CFLAGS_MODULE =
470AFLAGS_MODULE =
471LDFLAGS_MODULE =
472CFLAGS_KERNEL =
473AFLAGS_KERNEL =
474LDFLAGS_vmlinux =
475
476# Use USERINCLUDE when you must reference the UAPI directories only.
477USERINCLUDE := \
478 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
479 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
480 -I$(srctree)/include/uapi \
481 -I$(objtree)/include/generated/uapi \
482 -include $(srctree)/include/linux/kconfig.h
483
484# Use LINUXINCLUDE when you must reference the include/ directory.
485# Needed to be compatible with the O= option
486LINUXINCLUDE := \
487 -I$(srctree)/arch/$(SRCARCH)/include \
488 -I$(objtree)/arch/$(SRCARCH)/include/generated \
489 $(if $(building_out_of_srctree),-I$(srctree)/include) \
490 -I$(objtree)/include \
491 $(USERINCLUDE)
492
493KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
494KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
495 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
496 -Werror=implicit-function-declaration -Werror=implicit-int \
497 -Werror=return-type -Wno-format-security \
498 -std=gnu89
499KBUILD_CPPFLAGS := -D__KERNEL__
500KBUILD_AFLAGS_KERNEL :=
501KBUILD_CFLAGS_KERNEL :=
502KBUILD_AFLAGS_MODULE := -DMODULE
503KBUILD_CFLAGS_MODULE := -DMODULE
504KBUILD_LDFLAGS_MODULE :=
505KBUILD_LDFLAGS :=
506CLANG_FLAGS :=
507
508export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
509export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
510export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
511export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
512export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
513
514export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
515export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
516export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
517export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
518export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
519
520# Files to ignore in find ... statements
521
522export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
523 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
524 -prune -o
525export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
526 --exclude CVS --exclude .pc --exclude .hg --exclude .git
527
528# ===========================================================================
529# Rules shared between *config targets and build targets
530
531# Basic helpers built in scripts/basic/
532PHONY += scripts_basic
533scripts_basic:
534 $(Q)$(MAKE) $(build)=scripts/basic
535 $(Q)rm -f .tmp_quiet_recordmcount
536
537PHONY += outputmakefile
538# Before starting out-of-tree build, make sure the source tree is clean.
539# outputmakefile generates a Makefile in the output directory, if using a
540# separate output directory. This allows convenient use of make in the
541# output directory.
542# At the same time when output Makefile generated, generate .gitignore to
543# ignore whole output directory
544outputmakefile:
545ifdef building_out_of_srctree
546 $(Q)if [ -f $(srctree)/.config -o \
547 -d $(srctree)/include/config -o \
548 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
549 echo >&2 "***"; \
550 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
551 echo >&2 "*** in $(abs_srctree)";\
552 echo >&2 "***"; \
553 false; \
554 fi
555 $(Q)ln -fsn $(srctree) source
556 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
557 $(Q)test -e .gitignore || \
558 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
559endif
560
561ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
562ifneq ($(CROSS_COMPILE),)
563CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
564GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
565CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
566GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
567endif
568ifneq ($(GCC_TOOLCHAIN),)
569CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
570endif
571ifneq ($(LLVM_IAS),1)
572CLANG_FLAGS += -no-integrated-as
573endif
574CLANG_FLAGS += -Werror=unknown-warning-option
575KBUILD_CFLAGS += $(CLANG_FLAGS)
576KBUILD_AFLAGS += $(CLANG_FLAGS)
577export CLANG_FLAGS
578endif
579
580# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
581# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
582# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
583# and from include/config/auto.conf.cmd to detect the compiler upgrade.
584CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
585
586ifdef config-build
587# ===========================================================================
588# *config targets only - make sure prerequisites are updated, and descend
589# in scripts/kconfig to make the *config target
590
591# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
592# KBUILD_DEFCONFIG may point out an alternative default configuration
593# used for 'make defconfig'
594include arch/$(SRCARCH)/Makefile
595export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
596
597config: outputmakefile scripts_basic FORCE
598 $(Q)$(MAKE) $(build)=scripts/kconfig $@
599
600%config: outputmakefile scripts_basic FORCE
601 $(Q)$(MAKE) $(build)=scripts/kconfig $@
602
603else #!config-build
604# ===========================================================================
605# Build targets only - this includes vmlinux, arch specific targets, clean
606# targets and others. In general all targets except *config targets.
607
608# If building an external module we do not care about the all: rule
609# but instead __all depend on modules
610PHONY += all
611ifeq ($(KBUILD_EXTMOD),)
612__all: all
613else
614__all: modules
615endif
616
617# Decide whether to build built-in, modular, or both.
618# Normally, just do built-in.
619
620KBUILD_MODULES :=
621KBUILD_BUILTIN := 1
622
623# If we have only "make modules", don't compile built-in objects.
624ifeq ($(MAKECMDGOALS),modules)
625 KBUILD_BUILTIN :=
626endif
627
628# If we have "make <whatever> modules", compile modules
629# in addition to whatever we do anyway.
630# Just "make" or "make all" shall build modules as well
631
632ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
633 KBUILD_MODULES := 1
634endif
635
636ifeq ($(MAKECMDGOALS),)
637 KBUILD_MODULES := 1
638endif
639
640export KBUILD_MODULES KBUILD_BUILTIN
641
642ifdef need-config
643include include/config/auto.conf
644endif
645
646ifeq ($(KBUILD_EXTMOD),)
647# Objects we will link into vmlinux / subdirs we need to visit
648core-y := init/ usr/
649drivers-y := drivers/ sound/
650drivers-$(CONFIG_SAMPLES) += samples/
651drivers-y += net/ 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
834ifdef CONFIG_DEBUG_INFO_DWARF4
835DEBUG_CFLAGS += -gdwarf-4
836endif
837
838ifdef CONFIG_DEBUG_INFO_REDUCED
839DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
840 $(call cc-option,-fno-var-tracking)
841endif
842
843ifdef CONFIG_DEBUG_INFO_COMPRESSED
844DEBUG_CFLAGS += -gz=zlib
845KBUILD_AFLAGS += -gz=zlib
846KBUILD_LDFLAGS += --compress-debug-sections=zlib
847endif
848
849endif # CONFIG_DEBUG_INFO
850
851KBUILD_CFLAGS += $(DEBUG_CFLAGS)
852export DEBUG_CFLAGS
853
854ifdef CONFIG_FUNCTION_TRACER
855ifdef CONFIG_FTRACE_MCOUNT_RECORD
856 # gcc 5 supports generating the mcount tables directly
857 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
858 CC_FLAGS_FTRACE += -mrecord-mcount
859 export CC_USING_RECORD_MCOUNT := 1
860 endif
861 ifdef CONFIG_HAVE_NOP_MCOUNT
862 ifeq ($(call cc-option-yn, -mnop-mcount),y)
863 CC_FLAGS_FTRACE += -mnop-mcount
864 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
865 endif
866 endif
867endif
868ifdef CONFIG_HAVE_FENTRY
869 ifeq ($(call cc-option-yn, -mfentry),y)
870 CC_FLAGS_FTRACE += -mfentry
871 CC_FLAGS_USING += -DCC_USING_FENTRY
872 endif
873endif
874export CC_FLAGS_FTRACE
875KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
876KBUILD_AFLAGS += $(CC_FLAGS_USING)
877ifdef CONFIG_DYNAMIC_FTRACE
878 ifdef CONFIG_HAVE_C_RECORDMCOUNT
879 BUILD_C_RECORDMCOUNT := y
880 export BUILD_C_RECORDMCOUNT
881 endif
882endif
883endif
884
885# We trigger additional mismatches with less inlining
886ifdef CONFIG_DEBUG_SECTION_MISMATCH
887KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
888endif
889
890ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
891KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
892LDFLAGS_vmlinux += --gc-sections
893endif
894
895ifdef CONFIG_SHADOW_CALL_STACK
896CC_FLAGS_SCS := -fsanitize=shadow-call-stack
897KBUILD_CFLAGS += $(CC_FLAGS_SCS)
898export CC_FLAGS_SCS
899endif
900
901ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
902KBUILD_CFLAGS += -falign-functions=32
903endif
904
905# arch Makefile may override CC so keep this after arch Makefile is included
906NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
907
908# warn about C99 declaration after statement
909KBUILD_CFLAGS += -Wdeclaration-after-statement
910
911# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
912KBUILD_CFLAGS += -Wvla
913
914# disable pointer signed / unsigned warnings in gcc 4.0
915KBUILD_CFLAGS += -Wno-pointer-sign
916
917# disable stringop warnings in gcc 8+
918KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
919
920# We'll want to enable this eventually, but it's not going away for 5.7 at least
921KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
922KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
923KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
924
925# Another good warning that we'll want to enable eventually
926KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
927
928# Enabled with W=2, disabled by default as noisy
929KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
930
931# disable invalid "can't wrap" optimizations for signed / pointers
932KBUILD_CFLAGS += -fno-strict-overflow
933
934# Make sure -fstack-check isn't enabled (like gentoo apparently did)
935KBUILD_CFLAGS += -fno-stack-check
936
937# conserve stack if available
938KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
939
940# Prohibit date/time macros, which would make the build non-deterministic
941KBUILD_CFLAGS += -Werror=date-time
942
943# enforce correct pointer usage
944KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
945
946# Require designated initializers for all marked structures
947KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
948
949# change __FILE__ to the relative path from the srctree
950KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
951
952# include additional Makefiles when needed
953include-y := scripts/Makefile.extrawarn
954include-$(CONFIG_KASAN) += scripts/Makefile.kasan
955include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
956include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
957include-$(CONFIG_KCOV) += scripts/Makefile.kcov
958include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
959
960include $(addprefix $(srctree)/, $(include-y))
961
962# scripts/Makefile.gcc-plugins is intentionally included last.
963# Do not add $(call cc-option,...) below this line. When you build the kernel
964# from the clean source tree, the GCC plugins do not exist at this point.
965
966# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
967KBUILD_CPPFLAGS += $(KCPPFLAGS)
968KBUILD_AFLAGS += $(KAFLAGS)
969KBUILD_CFLAGS += $(KCFLAGS)
970
971KBUILD_LDFLAGS_MODULE += --build-id=sha1
972LDFLAGS_vmlinux += --build-id=sha1
973
974ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
975LDFLAGS_vmlinux += $(call ld-option, -X,)
976endif
977
978ifeq ($(CONFIG_RELR),y)
979LDFLAGS_vmlinux += --pack-dyn-relocs=relr
980endif
981
982# We never want expected sections to be placed heuristically by the
983# linker. All sections should be explicitly named in the linker script.
984ifdef CONFIG_LD_ORPHAN_WARN
985LDFLAGS_vmlinux += --orphan-handling=warn
986endif
987
988# Align the bit size of userspace programs with the kernel
989KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
990KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
991
992# make the checker run with the right architecture
993CHECKFLAGS += --arch=$(ARCH)
994
995# insure the checker run with the right endianness
996CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
997
998# the checker needs the correct machine size
999CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1000
1001# Default kernel image to build when no specific target is given.
1002# KBUILD_IMAGE may be overruled on the command line or
1003# set in the environment
1004# Also any assignments in arch/$(ARCH)/Makefile take precedence over
1005# this default value
1006export KBUILD_IMAGE ?= vmlinux
1007
1008#
1009# INSTALL_PATH specifies where to place the updated kernel and system map
1010# images. Default is /boot, but you can set it to other values
1011export INSTALL_PATH ?= /boot
1012
1013#
1014# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1015# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1016# an argument if needed. Otherwise it defaults to the kernel install path
1017#
1018export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1019
1020#
1021# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1022# relocations required by build roots. This is not defined in the
1023# makefile but the argument can be passed to make if needed.
1024#
1025
1026MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1027export MODLIB
1028
1029#
1030# INSTALL_MOD_STRIP, if defined, will cause modules to be
1031# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1032# the default option --strip-debug will be used. Otherwise,
1033# INSTALL_MOD_STRIP value will be used as the options to the strip command.
1034
1035ifdef INSTALL_MOD_STRIP
1036ifeq ($(INSTALL_MOD_STRIP),1)
1037mod_strip_cmd = $(STRIP) --strip-debug
1038else
1039mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1040endif # INSTALL_MOD_STRIP=1
1041else
1042mod_strip_cmd = true
1043endif # INSTALL_MOD_STRIP
1044export mod_strip_cmd
1045
1046# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1047# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1048# or CONFIG_MODULE_COMPRESS_XZ.
1049
1050mod_compress_cmd = true
1051ifdef CONFIG_MODULE_COMPRESS
1052 ifdef CONFIG_MODULE_COMPRESS_GZIP
1053 mod_compress_cmd = $(KGZIP) -n -f
1054 endif # CONFIG_MODULE_COMPRESS_GZIP
1055 ifdef CONFIG_MODULE_COMPRESS_XZ
1056 mod_compress_cmd = $(XZ) -f
1057 endif # CONFIG_MODULE_COMPRESS_XZ
1058endif # CONFIG_MODULE_COMPRESS
1059export mod_compress_cmd
1060
1061ifdef CONFIG_MODULE_SIG_ALL
1062$(eval $(call config_filename,MODULE_SIG_KEY))
1063
1064mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1065else
1066mod_sign_cmd = true
1067endif
1068export mod_sign_cmd
1069
1070HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1071
1072has_libelf = $(call try-run,\
1073 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1074
1075ifdef CONFIG_STACK_VALIDATION
1076 ifeq ($(has_libelf),1)
1077 objtool_target := tools/objtool FORCE
1078 else
1079 SKIP_STACK_VALIDATION := 1
1080 export SKIP_STACK_VALIDATION
1081 endif
1082endif
1083
1084ifdef CONFIG_BPF
1085ifdef CONFIG_DEBUG_INFO_BTF
1086 ifeq ($(has_libelf),1)
1087 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1088 else
1089 ERROR_RESOLVE_BTFIDS := 1
1090 endif
1091endif # CONFIG_DEBUG_INFO_BTF
1092endif # CONFIG_BPF
1093
1094PHONY += prepare0
1095
1096export MODORDER := $(extmod-prefix)modules.order
1097export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1098
1099ifeq ($(KBUILD_EXTMOD),)
1100core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1101
1102vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1103 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1104 $(libs-y) $(libs-m)))
1105
1106vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1107 $(patsubst %/,%,$(filter %/, $(core-) \
1108 $(drivers-) $(libs-))))
1109
1110subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1111 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1112 $(drivers-y) $(drivers-m)))
1113
1114build-dirs := $(vmlinux-dirs)
1115clean-dirs := $(vmlinux-alldirs)
1116
1117# Externally visible symbols (used by link-vmlinux.sh)
1118KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1119KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1120ifdef CONFIG_MODULES
1121KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1122KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1123else
1124KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1125endif
1126KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1127
1128export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1129export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1130# used by scripts/Makefile.package
1131export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1132
1133vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1134
1135# Recurse until adjust_autoksyms.sh is satisfied
1136PHONY += autoksyms_recursive
1137ifdef CONFIG_TRIM_UNUSED_KSYMS
1138# For the kernel to actually contain only the needed exported symbols,
1139# we have to build modules as well to determine what those symbols are.
1140# (this can be evaluated only once include/config/auto.conf has been included)
1141KBUILD_MODULES := 1
1142
1143autoksyms_recursive: descend modules.order
1144 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1145 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1146endif
1147
1148autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1149
1150quiet_cmd_autoksyms_h = GEN $@
1151 cmd_autoksyms_h = mkdir -p $(dir $@); \
1152 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1153
1154$(autoksyms_h):
1155 $(call cmd,autoksyms_h)
1156
1157ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1158
1159# Final link of vmlinux with optional arch pass after final link
1160cmd_link-vmlinux = \
1161 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1162 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1163
1164vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1165 +$(call if_changed,link-vmlinux)
1166
1167targets := vmlinux
1168
1169# The actual objects are generated when descending,
1170# make sure no implicit rule kicks in
1171$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1172
1173filechk_kernel.release = \
1174 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1175
1176# Store (new) KERNELRELEASE string in include/config/kernel.release
1177include/config/kernel.release: FORCE
1178 $(call filechk,kernel.release)
1179
1180# Additional helpers built in scripts/
1181# Carefully list dependencies so we do not try to build scripts twice
1182# in parallel
1183PHONY += scripts
1184scripts: scripts_basic scripts_dtc
1185 $(Q)$(MAKE) $(build)=$(@)
1186
1187# Things we need to do before we recursively start building the kernel
1188# or the modules are listed in "prepare".
1189# A multi level approach is used. prepareN is processed before prepareN-1.
1190# archprepare is used in arch Makefiles and when processed asm symlink,
1191# version.h and scripts_basic is processed / created.
1192
1193PHONY += prepare archprepare
1194
1195archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1196 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1197 include/generated/autoconf.h
1198
1199prepare0: archprepare
1200 $(Q)$(MAKE) $(build)=scripts/mod
1201 $(Q)$(MAKE) $(build)=.
1202
1203# All the preparing..
1204prepare: prepare0 prepare-objtool prepare-resolve_btfids
1205
1206# Support for using generic headers in asm-generic
1207asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1208
1209PHONY += asm-generic uapi-asm-generic
1210asm-generic: uapi-asm-generic
1211 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1212 generic=include/asm-generic
1213uapi-asm-generic:
1214 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1215 generic=include/uapi/asm-generic
1216
1217PHONY += prepare-objtool prepare-resolve_btfids
1218prepare-objtool: $(objtool_target)
1219ifeq ($(SKIP_STACK_VALIDATION),1)
1220ifdef CONFIG_UNWINDER_ORC
1221 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1222 @false
1223else
1224 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1225endif
1226endif
1227
1228prepare-resolve_btfids: $(resolve_btfids_target)
1229ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1230 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1231 @false
1232endif
1233# Generate some files
1234# ---------------------------------------------------------------------------
1235
1236# KERNELRELEASE can change from a few different places, meaning version.h
1237# needs to be updated, so this check is forced on all builds
1238
1239uts_len := 64
1240define filechk_utsrelease.h
1241 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1242 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1243 exit 1; \
1244 fi; \
1245 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1246endef
1247
1248define filechk_version.h
1249 echo \#define LINUX_VERSION_CODE $(shell \
1250 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1251 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1252endef
1253
1254$(version_h): FORCE
1255 $(call filechk,version.h)
1256 $(Q)rm -f $(old_version_h)
1257
1258include/generated/utsrelease.h: include/config/kernel.release FORCE
1259 $(call filechk,utsrelease.h)
1260
1261PHONY += headerdep
1262headerdep:
1263 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1264 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1265
1266# ---------------------------------------------------------------------------
1267# Kernel headers
1268
1269#Default location for installed headers
1270export INSTALL_HDR_PATH = $(objtree)/usr
1271
1272quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1273 cmd_headers_install = \
1274 mkdir -p $(INSTALL_HDR_PATH); \
1275 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1276 usr/include $(INSTALL_HDR_PATH)
1277
1278PHONY += headers_install
1279headers_install: headers
1280 $(call cmd,headers_install)
1281
1282PHONY += archheaders archscripts
1283
1284hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1285
1286PHONY += headers
1287headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1288 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1289 $(error Headers not exportable for the $(SRCARCH) architecture))
1290 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1291 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1292
1293# Deprecated. It is no-op now.
1294PHONY += headers_check
1295headers_check:
1296 @:
1297
1298ifdef CONFIG_HEADERS_INSTALL
1299prepare: headers
1300endif
1301
1302PHONY += scripts_unifdef
1303scripts_unifdef: scripts_basic
1304 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1305
1306# ---------------------------------------------------------------------------
1307# Kernel selftest
1308
1309PHONY += kselftest
1310kselftest:
1311 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1312
1313kselftest-%: FORCE
1314 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1315
1316PHONY += kselftest-merge
1317kselftest-merge:
1318 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1319 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1320 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1321 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1322
1323# ---------------------------------------------------------------------------
1324# Devicetree files
1325
1326ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1327dtstree := arch/$(SRCARCH)/boot/dts
1328endif
1329
1330ifneq ($(dtstree),)
1331
1332%.dtb: include/config/kernel.release scripts_dtc
1333 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1334
1335PHONY += dtbs dtbs_install dtbs_check
1336dtbs: include/config/kernel.release scripts_dtc
1337 $(Q)$(MAKE) $(build)=$(dtstree)
1338
1339ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1340export CHECK_DTBS=y
1341dtbs: dt_binding_check
1342endif
1343
1344dtbs_check: dtbs
1345
1346dtbs_install:
1347 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1348
1349ifdef CONFIG_OF_EARLY_FLATTREE
1350all: dtbs
1351endif
1352
1353endif
1354
1355PHONY += scripts_dtc
1356scripts_dtc: scripts_basic
1357 $(Q)$(MAKE) $(build)=scripts/dtc
1358
1359ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1360export CHECK_DT_BINDING=y
1361endif
1362
1363PHONY += dt_binding_check
1364dt_binding_check: scripts_dtc
1365 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1366
1367# ---------------------------------------------------------------------------
1368# Modules
1369
1370ifdef CONFIG_MODULES
1371
1372# By default, build modules as well
1373
1374all: modules
1375
1376# When we're building modules with modversions, we need to consider
1377# the built-in objects during the descend as well, in order to
1378# make sure the checksums are up to date before we record them.
1379ifdef CONFIG_MODVERSIONS
1380 KBUILD_BUILTIN := 1
1381endif
1382
1383# Build modules
1384#
1385# A module can be listed more than once in obj-m resulting in
1386# duplicate lines in modules.order files. Those are removed
1387# using awk while concatenating to the final file.
1388
1389PHONY += modules
1390modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1391 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1392
1393PHONY += modules_check
1394modules_check: modules.order
1395 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1396
1397cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1398
1399modules.order: $(subdir-modorder) FORCE
1400 $(call if_changed,modules_order)
1401
1402targets += modules.order
1403
1404# Target to prepare building external modules
1405PHONY += modules_prepare
1406modules_prepare: prepare
1407 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1408
1409# Target to install modules
1410PHONY += modules_install
1411modules_install: _modinst_ _modinst_post
1412
1413PHONY += _modinst_
1414_modinst_:
1415 @rm -rf $(MODLIB)/kernel
1416 @rm -f $(MODLIB)/source
1417 @mkdir -p $(MODLIB)/kernel
1418 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1419 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1420 rm -f $(MODLIB)/build ; \
1421 ln -s $(CURDIR) $(MODLIB)/build ; \
1422 fi
1423 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1424 @cp -f modules.builtin $(MODLIB)/
1425 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1426 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1427
1428# This depmod is only for convenience to give the initial
1429# boot a modules.dep even before / is mounted read-write. However the
1430# boot script depmod is the master version.
1431PHONY += _modinst_post
1432_modinst_post: _modinst_
1433 $(call cmd,depmod)
1434
1435ifeq ($(CONFIG_MODULE_SIG), y)
1436PHONY += modules_sign
1437modules_sign:
1438 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1439endif
1440
1441else # CONFIG_MODULES
1442
1443# Modules not configured
1444# ---------------------------------------------------------------------------
1445
1446PHONY += modules modules_install
1447modules modules_install:
1448 @echo >&2
1449 @echo >&2 "The present kernel configuration has modules disabled."
1450 @echo >&2 "Type 'make config' and enable loadable module support."
1451 @echo >&2 "Then build a kernel with module support enabled."
1452 @echo >&2
1453 @exit 1
1454
1455endif # CONFIG_MODULES
1456
1457###
1458# Cleaning is done on three levels.
1459# make clean Delete most generated files
1460# Leave enough to build external modules
1461# make mrproper Delete the current configuration, and all generated files
1462# make distclean Remove editor backup files, patch leftover files and the like
1463
1464# Directories & files removed with 'make clean'
1465CLEAN_FILES += include/ksym vmlinux.symvers \
1466 modules.builtin modules.builtin.modinfo modules.nsdeps \
1467 compile_commands.json
1468
1469# Directories & files removed with 'make mrproper'
1470MRPROPER_FILES += include/config include/generated \
1471 arch/$(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: $(INSTALL_HDR_PATH))'; \
1570 echo ''
1571 @echo 'Static analysers:'
1572 @echo ' checkstack - Generate a list of stack hogs'
1573 @echo ' versioncheck - Sanity check on version.h usage'
1574 @echo ' includecheck - Check for duplicate included header files'
1575 @echo ' export_report - List the usages of all exported symbols'
1576 @echo ' headerdep - Detect inclusion cycles in headers'
1577 @echo ' coccicheck - Check with Coccinelle'
1578 @echo ' clang-analyzer - Check with clang static analyzer'
1579 @echo ' clang-tidy - Check with clang-tidy'
1580 @echo ''
1581 @echo 'Tools:'
1582 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1583 @echo ''
1584 @echo 'Kernel selftest:'
1585 @echo ' kselftest - Build and run kernel selftest'
1586 @echo ' Build, install, and boot kernel before'
1587 @echo ' running kselftest on it'
1588 @echo ' Run as root for full coverage'
1589 @echo ' kselftest-all - Build kernel selftest'
1590 @echo ' kselftest-install - Build and install kernel selftest'
1591 @echo ' kselftest-clean - Remove all generated kselftest files'
1592 @echo ' kselftest-merge - Merge all the config dependencies of'
1593 @echo ' kselftest to existing .config.'
1594 @echo ''
1595 @$(if $(dtstree), \
1596 echo 'Devicetree:'; \
1597 echo '* dtbs - Build device tree blobs for enabled boards'; \
1598 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1599 echo ' dt_binding_check - Validate device tree binding documents'; \
1600 echo ' dtbs_check - Validate device tree source files';\
1601 echo '')
1602
1603 @echo 'Userspace tools targets:'
1604 @echo ' use "make tools/help"'
1605 @echo ' or "cd tools; make help"'
1606 @echo ''
1607 @echo 'Kernel packaging:'
1608 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1609 @echo ''
1610 @echo 'Documentation targets:'
1611 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1612 @echo ''
1613 @echo 'Architecture specific targets ($(SRCARCH)):'
1614 @$(if $(archhelp),$(archhelp),\
1615 echo ' No architecture specific help defined for $(SRCARCH)')
1616 @echo ''
1617 @$(if $(boards), \
1618 $(foreach b, $(boards), \
1619 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1620 echo '')
1621 @$(if $(board-dirs), \
1622 $(foreach b, $(board-dirs), \
1623 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1624 printf " %-16s - Show all of the above\\n" help-boards; \
1625 echo '')
1626
1627 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1628 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1629 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1630 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1631 @echo ' (sparse by default)'
1632 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1633 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1634 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1635 @echo ' 1: warnings which may be relevant and do not occur too often'
1636 @echo ' 2: warnings which occur quite often but may still be relevant'
1637 @echo ' 3: more obscure warnings, can most likely be ignored'
1638 @echo ' Multiple levels can be combined with W=12 or W=123'
1639 @echo ''
1640 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1641 @echo 'For further info see the ./README file'
1642
1643
1644help-board-dirs := $(addprefix help-,$(board-dirs))
1645
1646help-boards: $(help-board-dirs)
1647
1648boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1649
1650$(help-board-dirs): help-%:
1651 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1652 @$(if $(boards-per-dir), \
1653 $(foreach b, $(boards-per-dir), \
1654 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1655 echo '')
1656
1657
1658# Documentation targets
1659# ---------------------------------------------------------------------------
1660DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1661 linkcheckdocs dochelp refcheckdocs
1662PHONY += $(DOC_TARGETS)
1663$(DOC_TARGETS):
1664 $(Q)$(MAKE) $(build)=Documentation $@
1665
1666# Misc
1667# ---------------------------------------------------------------------------
1668
1669PHONY += scripts_gdb
1670scripts_gdb: prepare0
1671 $(Q)$(MAKE) $(build)=scripts/gdb
1672 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1673
1674ifdef CONFIG_GDB_SCRIPTS
1675all: scripts_gdb
1676endif
1677
1678else # KBUILD_EXTMOD
1679
1680###
1681# External module support.
1682# When building external modules the kernel used as basis is considered
1683# read-only, and no consistency checks are made and the make
1684# system is not used on the basis kernel. If updates are required
1685# in the basis kernel ordinary make commands (without M=...) must
1686# be used.
1687#
1688# The following are the only valid targets when building external
1689# modules.
1690# make M=dir clean Delete all automatically generated files
1691# make M=dir modules Make all modules in specified dir
1692# make M=dir Same as 'make M=dir modules'
1693# make M=dir modules_install
1694# Install the modules built in the module directory
1695# Assumes install directory is already created
1696
1697# We are always building only modules.
1698KBUILD_BUILTIN :=
1699KBUILD_MODULES := 1
1700
1701build-dirs := $(KBUILD_EXTMOD)
1702PHONY += modules
1703modules: $(MODORDER)
1704 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1705
1706$(MODORDER): descend
1707 @:
1708
1709PHONY += modules_install
1710modules_install: _emodinst_ _emodinst_post
1711
1712install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1713PHONY += _emodinst_
1714_emodinst_:
1715 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1716 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1717
1718PHONY += _emodinst_post
1719_emodinst_post: _emodinst_
1720 $(call cmd,depmod)
1721
1722compile_commands.json: $(extmod-prefix)compile_commands.json
1723PHONY += compile_commands.json
1724
1725clean-dirs := $(KBUILD_EXTMOD)
1726clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1727 $(KBUILD_EXTMOD)/compile_commands.json
1728
1729PHONY += help
1730help:
1731 @echo ' Building external modules.'
1732 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1733 @echo ''
1734 @echo ' modules - default target, build the module(s)'
1735 @echo ' modules_install - install the module'
1736 @echo ' clean - remove generated files in module directory only'
1737 @echo ''
1738
1739# no-op for external module builds
1740PHONY += prepare modules_prepare
1741
1742endif # KBUILD_EXTMOD
1743
1744# Single targets
1745# ---------------------------------------------------------------------------
1746# To build individual files in subdirectories, you can do like this:
1747#
1748# make foo/bar/baz.s
1749#
1750# The supported suffixes for single-target are listed in 'single-targets'
1751#
1752# To build only under specific subdirectories, you can do like this:
1753#
1754# make foo/bar/baz/
1755
1756ifdef single-build
1757
1758# .ko is special because modpost is needed
1759single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1760single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1761
1762$(single-ko): single_modpost
1763 @:
1764$(single-no-ko): descend
1765 @:
1766
1767ifeq ($(KBUILD_EXTMOD),)
1768# For the single build of in-tree modules, use a temporary file to avoid
1769# the situation of modules_install installing an invalid modules.order.
1770MODORDER := .modules.tmp
1771endif
1772
1773PHONY += single_modpost
1774single_modpost: $(single-no-ko) modules_prepare
1775 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1776 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1777
1778KBUILD_MODULES := 1
1779
1780export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1781
1782# trim unrelated directories
1783build-dirs := $(foreach d, $(build-dirs), \
1784 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1785
1786endif
1787
1788ifndef CONFIG_MODULES
1789KBUILD_MODULES :=
1790endif
1791
1792# Handle descending into subdirectories listed in $(build-dirs)
1793# Preset locale variables to speed up the build process. Limit locale
1794# tweaks to this spot to avoid wrong language settings when running
1795# make menuconfig etc.
1796# Error messages still appears in the original language
1797PHONY += descend $(build-dirs)
1798descend: $(build-dirs)
1799$(build-dirs): prepare
1800 $(Q)$(MAKE) $(build)=$@ \
1801 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1802 need-builtin=1 need-modorder=1
1803
1804clean-dirs := $(addprefix _clean_, $(clean-dirs))
1805PHONY += $(clean-dirs) clean
1806$(clean-dirs):
1807 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1808
1809clean: $(clean-dirs)
1810 $(call cmd,rmfiles)
1811 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1812 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1813 -o -name '*.ko.*' \
1814 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1815 -o -name '*.dwo' -o -name '*.lst' \
1816 -o -name '*.su' -o -name '*.mod' \
1817 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1818 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1819 -o -name '*.asn1.[ch]' \
1820 -o -name '*.symtypes' -o -name 'modules.order' \
1821 -o -name '.tmp_*.o.*' \
1822 -o -name '*.c.[012]*.*' \
1823 -o -name '*.ll' \
1824 -o -name '*.gcno' \) -type f -print | xargs rm -f
1825
1826# Generate tags for editors
1827# ---------------------------------------------------------------------------
1828quiet_cmd_tags = GEN $@
1829 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1830
1831tags TAGS cscope gtags: FORCE
1832 $(call cmd,tags)
1833
1834# Script to generate missing namespace dependencies
1835# ---------------------------------------------------------------------------
1836
1837PHONY += nsdeps
1838nsdeps: export KBUILD_NSDEPS=1
1839nsdeps: modules
1840 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1841
1842# Clang Tooling
1843# ---------------------------------------------------------------------------
1844
1845quiet_cmd_gen_compile_commands = GEN $@
1846 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1847
1848$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1849 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1850 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1851 $(call if_changed,gen_compile_commands)
1852
1853targets += $(extmod-prefix)compile_commands.json
1854
1855PHONY += clang-tidy clang-analyzer
1856
1857ifdef CONFIG_CC_IS_CLANG
1858quiet_cmd_clang_tools = CHECK $<
1859 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1860
1861clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1862 $(call cmd,clang_tools)
1863else
1864clang-tidy clang-analyzer:
1865 @echo "$@ requires CC=clang" >&2
1866 @false
1867endif
1868
1869# Scripts to check various things for consistency
1870# ---------------------------------------------------------------------------
1871
1872PHONY += includecheck versioncheck coccicheck export_report
1873
1874includecheck:
1875 find $(srctree)/* $(RCS_FIND_IGNORE) \
1876 -name '*.[hcS]' -type f -print | sort \
1877 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1878
1879versioncheck:
1880 find $(srctree)/* $(RCS_FIND_IGNORE) \
1881 -name '*.[hcS]' -type f -print | sort \
1882 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1883
1884coccicheck:
1885 $(Q)$(BASH) $(srctree)/scripts/$@
1886
1887export_report:
1888 $(PERL) $(srctree)/scripts/export_report.pl
1889
1890PHONY += checkstack kernelrelease kernelversion image_name
1891
1892# UML needs a little special treatment here. It wants to use the host
1893# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1894# else wants $(ARCH), including people doing cross-builds, which means
1895# that $(SUBARCH) doesn't work here.
1896ifeq ($(ARCH), um)
1897CHECKSTACK_ARCH := $(SUBARCH)
1898else
1899CHECKSTACK_ARCH := $(ARCH)
1900endif
1901checkstack:
1902 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1903 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1904
1905kernelrelease:
1906 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1907
1908kernelversion:
1909 @echo $(KERNELVERSION)
1910
1911image_name:
1912 @echo $(KBUILD_IMAGE)
1913
1914# Clear a bunch of variables before executing the submake
1915
1916ifeq ($(quiet),silent_)
1917tools_silent=s
1918endif
1919
1920tools/: FORCE
1921 $(Q)mkdir -p $(objtree)/tools
1922 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1923
1924tools/%: FORCE
1925 $(Q)mkdir -p $(objtree)/tools
1926 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1927
1928quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1929 cmd_rmfiles = rm -rf $(rm-files)
1930
1931# Run depmod only if we have System.map and depmod is executable
1932quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1933 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1934 $(KERNELRELEASE)
1935
1936# read saved command lines for existing targets
1937existing-targets := $(wildcard $(sort $(targets)))
1938
1939-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1940
1941endif # config-build
1942endif # mixed-build
1943endif # need-sub-make
1944
1945PHONY += FORCE
1946FORCE:
1947
1948# Declare the contents of the PHONY variable as phony. We keep that
1949# information in a variable so we can use it in if_changed and friends.
1950.PHONY: $(PHONY)