1 # SPDX-License-Identifier: GPL-2.0
6 NAME = Kleptomaniac Octopus
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.
14 $(if $(filter __%, $(MAKECMDGOALS)), \
15 $(error targets prefixed with '__' are only for internal use))
17 # That's our default target when none is given on the command line
21 # We are using a recursive build, so we need to do a little thinking
22 # to get the ordering right.
24 # Most importantly: sub-Makefiles should only ever modify files in
25 # their own directory. If in some directory we have a dependency on
26 # a file in another dir (which doesn't happen often, but it's often
27 # unavoidable when linking the built-in.a targets which finally
28 # turn into vmlinux), we will call a sub make in that other dir, and
29 # after that we are sure that everything which is in that other dir
32 # The only cases where we need to modify files which have global
33 # effects are thus separated out and done before the recursive
34 # descending is started. They are now explicitly listed as the
37 ifneq ($(sub_make_done),1)
39 # Do not use make's built-in rules and variables
40 # (this increases performance and avoids hard-to-debug behaviour)
43 # Avoid funny character set dependencies
47 export LC_COLLATE LC_NUMERIC
49 # Avoid interference with shell env settings
53 # ---------------------------------------------------------------------------
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.
59 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
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.
67 # A simple variant is to prefix commands with $(Q) - that's useful
68 # for commands that shall be hidden in non-verbose mode.
72 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
74 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
76 # To put more focus on warnings, be less verbose as default
77 # Use 'make V=1' to see the full commands
79 ifeq ("$(origin V)", "command line")
86 ifeq ($(KBUILD_VERBOSE),1)
94 # If the user is running make -s (silent mode), suppress echoing of
97 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
101 export quiet Q KBUILD_VERBOSE
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.
106 # For example, you can do this:
108 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
110 # If you want to save output files in a different location, there are
111 # two syntaxes to specify it.
114 # Use "make O=dir/to/store/output/files/"
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
120 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
123 # Do we want to change the working directory?
124 ifeq ("$(origin O)", "command line")
125 KBUILD_OUTPUT := $(O)
128 ifneq ($(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.
131 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
132 $(if $(abs_objtree),, \
133 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
135 # $(realpath ...) resolves symlinks
136 abs_objtree := $(realpath $(abs_objtree))
138 abs_objtree := $(CURDIR)
139 endif # ifneq ($(KBUILD_OUTPUT),)
141 ifeq ($(abs_objtree),$(CURDIR))
142 # Suppress "Entering directory ..." unless we are changing the work directory.
143 MAKEFLAGS += --no-print-directory
148 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
150 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
151 $(error source directory cannot contain spaces or colons)
154 ifneq ($(abs_srctree),$(abs_objtree))
155 # Look for make include files relative to root of kernel src
157 # This does not become effective immediately because MAKEFLAGS is re-parsed
158 # once after the Makefile is read. We need to invoke sub-make.
159 MAKEFLAGS += --include-dir=$(abs_srctree)
163 this-makefile := $(lastword $(MAKEFILE_LIST))
165 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
166 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
167 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
169 # Cancel implicit rules for this Makefile.
173 export abs_srctree abs_objtree
174 export sub_make_done := 1
176 ifeq ($(need-sub-make),1)
178 PHONY += $(MAKECMDGOALS) __sub-make
180 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
183 # Invoke a second make in the output directory, passing relevant variables
185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
187 endif # need-sub-make
188 endif # sub_make_done
190 # We process the rest of the Makefile if this is the final invocation of make
191 ifeq ($(need-sub-make),)
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.
196 MAKEFLAGS += --no-print-directory
198 # Call a source code checker (by default, "sparse") as part of the
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.
205 # See the file "Documentation/dev-tools/sparse.rst" for more details,
206 # including where to get the "sparse" utility.
208 ifeq ("$(origin C)", "command line")
209 KBUILD_CHECKSRC = $(C)
211 ifndef KBUILD_CHECKSRC
215 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
216 # directory of external module to build. Setting M= takes precedence.
217 ifeq ("$(origin M)", "command line")
218 KBUILD_EXTMOD := $(M)
221 $(if $(word 2, $(KBUILD_EXTMOD)), \
222 $(error building multiple external modules is not supported))
224 export KBUILD_CHECKSRC KBUILD_EXTMOD
226 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
228 ifeq ($(abs_srctree),$(abs_objtree))
229 # building in the source tree
231 building_out_of_srctree :=
233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
234 # building in a subdirectory of the source tree
237 srctree := $(abs_srctree)
239 building_out_of_srctree := 1
242 ifneq ($(KBUILD_ABS_SRCTREE),)
243 srctree := $(abs_srctree)
249 export building_out_of_srctree srctree objtree VPATH
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).
259 version_h := include/generated/uapi/linux/version.h
261 clean-targets := %clean mrproper cleandocs
262 no-dot-config-targets := $(clean-targets) \
263 cscope gtags TAGS tags help% %docs check% coccicheck \
264 $(version_h) headers headers_% archheaders archscripts \
265 %asm-generic kernelversion %src-pkg dt_binding_check \
267 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease
268 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
276 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
277 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
282 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
283 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
288 ifneq ($(KBUILD_EXTMOD),)
292 ifeq ($(KBUILD_EXTMOD),)
293 ifneq ($(filter %config,$(MAKECMDGOALS)),)
295 ifneq ($(words $(MAKECMDGOALS)),1)
301 # We cannot build single targets and the others at the same time
302 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
304 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
309 # For "make -j clean all", "make -j mrproper defconfig all", etc.
310 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
311 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
316 # install and modules_install need also be processed one by one
317 ifneq ($(filter install,$(MAKECMDGOALS)),)
318 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
324 # ===========================================================================
325 # We're called with mixed targets (*config and build targets).
326 # Handle them one by one.
328 PHONY += $(MAKECMDGOALS) __build_one_by_one
330 $(MAKECMDGOALS): __build_one_by_one
335 for i in $(MAKECMDGOALS); do \
336 $(MAKE) -f $(srctree)/Makefile $$i; \
341 include scripts/Kbuild.include
343 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
344 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
345 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
346 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
348 include scripts/subarch.include
350 # Cross compiling and selecting different set of gcc/bin-utils
351 # ---------------------------------------------------------------------------
353 # When performing cross compilation for other architectures ARCH shall be set
354 # to the target architecture. (See arch/* for the possibilities).
355 # ARCH can be set during invocation of make:
357 # Another way is to have ARCH set in the environment.
358 # The default ARCH is the host where make is executed.
360 # CROSS_COMPILE specify the prefix used for all executables used
361 # during compilation. Only gcc and related bin-utils executables
362 # are prefixed with $(CROSS_COMPILE).
363 # CROSS_COMPILE can be set on the command line
364 # make CROSS_COMPILE=ia64-linux-
365 # Alternatively CROSS_COMPILE can be set in the environment.
366 # Default value for CROSS_COMPILE is not to prefix executables
367 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
370 # Architecture as present in compile.h
371 UTS_MACHINE := $(ARCH)
374 # Additional ARCH settings for x86
378 ifeq ($(ARCH),x86_64)
382 # Additional ARCH settings for sparc
383 ifeq ($(ARCH),sparc32)
386 ifeq ($(ARCH),sparc64)
390 # Additional ARCH settings for sh
395 KCONFIG_CONFIG ?= .config
396 export KCONFIG_CONFIG
398 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
399 export KBUILD_DEFCONFIG := defconfig
401 # SHELL used by kbuild
404 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
405 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
406 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
416 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
417 -O2 -fomit-frame-pointer -std=gnu89
418 export KBUILD_USERLDFLAGS :=
420 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
421 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
422 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
423 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
425 # Make variables (CC, etc...)
432 OBJCOPY = llvm-objcopy
433 OBJDUMP = llvm-objdump
434 READELF = llvm-readelf
437 CC = $(CROSS_COMPILE)gcc
438 LD = $(CROSS_COMPILE)ld
439 AR = $(CROSS_COMPILE)ar
440 NM = $(CROSS_COMPILE)nm
441 OBJCOPY = $(CROSS_COMPILE)objcopy
442 OBJDUMP = $(CROSS_COMPILE)objdump
443 READELF = $(CROSS_COMPILE)readelf
444 STRIP = $(CROSS_COMPILE)strip
447 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
451 INSTALLKERNEL := installkernel
465 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
466 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
475 # Use USERINCLUDE when you must reference the UAPI directories only.
477 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
478 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
479 -I$(srctree)/include/uapi \
480 -I$(objtree)/include/generated/uapi \
481 -include $(srctree)/include/linux/kconfig.h
483 # Use LINUXINCLUDE when you must reference the include/ directory.
484 # Needed to be compatible with the O= option
486 -I$(srctree)/arch/$(SRCARCH)/include \
487 -I$(objtree)/arch/$(SRCARCH)/include/generated \
488 $(if $(building_out_of_srctree),-I$(srctree)/include) \
489 -I$(objtree)/include \
492 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
493 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
494 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
495 -Werror=implicit-function-declaration -Werror=implicit-int \
496 -Werror=return-type -Wno-format-security \
498 KBUILD_CPPFLAGS := -D__KERNEL__
499 KBUILD_AFLAGS_KERNEL :=
500 KBUILD_CFLAGS_KERNEL :=
501 KBUILD_AFLAGS_MODULE := -DMODULE
502 KBUILD_CFLAGS_MODULE := -DMODULE
503 KBUILD_LDFLAGS_MODULE :=
507 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
508 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
509 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
510 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
511 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
513 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
514 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
515 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
516 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
517 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
519 # Files to ignore in find ... statements
521 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
522 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
524 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
525 --exclude CVS --exclude .pc --exclude .hg --exclude .git
527 # ===========================================================================
528 # Rules shared between *config targets and build targets
530 # Basic helpers built in scripts/basic/
531 PHONY += scripts_basic
533 $(Q)$(MAKE) $(build)=scripts/basic
534 $(Q)rm -f .tmp_quiet_recordmcount
536 PHONY += outputmakefile
537 # Before starting out-of-tree build, make sure the source tree is clean.
538 # outputmakefile generates a Makefile in the output directory, if using a
539 # separate output directory. This allows convenient use of make in the
541 # At the same time when output Makefile generated, generate .gitignore to
542 # ignore whole output directory
544 ifdef building_out_of_srctree
545 $(Q)if [ -f $(srctree)/.config -o \
546 -d $(srctree)/include/config -o \
547 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
549 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
550 echo >&2 "*** in $(abs_srctree)";\
554 $(Q)ln -fsn $(srctree) source
555 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
556 $(Q)test -e .gitignore || \
557 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
560 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
561 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
562 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
563 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
564 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
566 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
567 ifneq ($(CROSS_COMPILE),)
568 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
569 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
570 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
571 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
573 ifneq ($(GCC_TOOLCHAIN),)
574 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
576 ifneq ($(LLVM_IAS),1)
577 CLANG_FLAGS += -no-integrated-as
579 CLANG_FLAGS += -Werror=unknown-warning-option
580 KBUILD_CFLAGS += $(CLANG_FLAGS)
581 KBUILD_AFLAGS += $(CLANG_FLAGS)
586 # ===========================================================================
587 # *config targets only - make sure prerequisites are updated, and descend
588 # in scripts/kconfig to make the *config target
590 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
591 # KBUILD_DEFCONFIG may point out an alternative default configuration
592 # used for 'make defconfig'
593 include arch/$(SRCARCH)/Makefile
594 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
596 config: outputmakefile scripts_basic FORCE
597 $(Q)$(MAKE) $(build)=scripts/kconfig $@
599 %config: outputmakefile scripts_basic FORCE
600 $(Q)$(MAKE) $(build)=scripts/kconfig $@
603 # ===========================================================================
604 # Build targets only - this includes vmlinux, arch specific targets, clean
605 # targets and others. In general all targets except *config targets.
607 # If building an external module we do not care about the all: rule
608 # but instead __all depend on modules
610 ifeq ($(KBUILD_EXTMOD),)
616 # Decide whether to build built-in, modular, or both.
617 # Normally, just do built-in.
622 # If we have only "make modules", don't compile built-in objects.
623 ifeq ($(MAKECMDGOALS),modules)
627 # If we have "make <whatever> modules", compile modules
628 # in addition to whatever we do anyway.
629 # Just "make" or "make all" shall build modules as well
631 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
635 ifeq ($(MAKECMDGOALS),)
639 export KBUILD_MODULES KBUILD_BUILTIN
642 include include/config/auto.conf
645 ifeq ($(KBUILD_EXTMOD),)
646 # Objects we will link into vmlinux / subdirs we need to visit
648 drivers-y := drivers/ sound/
649 drivers-$(CONFIG_SAMPLES) += samples/
650 drivers-y += net/ virt/
652 endif # KBUILD_EXTMOD
654 # The all: target is the default when no target is given on the
656 # This allow a user to issue only 'make' to build a kernel including modules
657 # Defaults to vmlinux, but the arch makefile usually adds further targets
660 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
661 $(call cc-option,-fno-tree-loop-im) \
662 $(call cc-disable-warning,maybe-uninitialized,)
665 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
666 ifdef CONFIG_FUNCTION_TRACER
667 CC_FLAGS_FTRACE := -pg
670 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
671 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
672 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
673 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
674 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
675 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
676 export RETPOLINE_CFLAGS
677 export RETPOLINE_VDSO_CFLAGS
679 include arch/$(SRCARCH)/Makefile
682 ifdef may-sync-config
683 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
684 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
685 # because some architectures define CROSS_COMPILE there.
686 include include/config/auto.conf.cmd
690 @echo >&2 '*** Configuration file "$@" not found!'
692 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
693 @echo >&2 '*** "make menuconfig" or "make xconfig").'
697 # The actual configuration files used during the build are stored in
698 # include/generated/ and include/config/. Update them if .config is newer than
699 # include/config/auto.conf (which mirrors .config).
701 # This exploits the 'multi-target pattern rule' trick.
702 # The syncconfig should be executed only once to make all the targets.
703 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
704 quiet_cmd_syncconfig = SYNC $@
705 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig
707 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
708 +$(call cmd,syncconfig)
709 else # !may-sync-config
710 # External modules and some install targets need include/generated/autoconf.h
711 # and include/config/auto.conf but do not care if they are up-to-date.
712 # Use auto.conf to trigger the test
713 PHONY += include/config/auto.conf
715 include/config/auto.conf:
716 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
718 echo >&2 " ERROR: Kernel configuration is invalid."; \
719 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
720 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
724 endif # may-sync-config
727 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
728 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
729 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
730 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
731 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
733 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
735 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
737 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
741 # Tell gcc to never replace conditional load with a non-conditional one
742 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
743 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
745 ifdef CONFIG_READABLE_ASM
746 # Disable optimizations that make assembler listings hard to read.
747 # reorder blocks reorders the control in the function
748 # ipa clone creates specialized cloned functions
749 # partial inlining inlines only parts of functions
750 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
751 $(call cc-option,-fno-ipa-cp-clone,) \
752 $(call cc-option,-fno-partial-inlining)
755 ifneq ($(CONFIG_FRAME_WARN),0)
756 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
759 stackp-flags-y := -fno-stack-protector
760 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
761 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
763 KBUILD_CFLAGS += $(stackp-flags-y)
765 ifdef CONFIG_CC_IS_CLANG
766 KBUILD_CPPFLAGS += -Qunused-arguments
767 KBUILD_CFLAGS += -Wno-format-invalid-specifier
768 KBUILD_CFLAGS += -Wno-gnu
769 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
770 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
771 # See modpost pattern 2
772 KBUILD_CFLAGS += -mno-global-merge
775 # These warnings generated too much noise in a regular build.
776 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
777 KBUILD_CFLAGS += -Wno-unused-but-set-variable
779 # Warn about unmarked fall-throughs in switch statement.
780 # Disabled for clang while comment to attribute conversion happens and
781 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
782 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
785 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
786 ifdef CONFIG_FRAME_POINTER
787 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
789 # Some targets (ARM with Thumb2, for example), can't be built with frame
790 # pointers. For those, we don't have FUNCTION_TRACER automatically
791 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
792 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
793 # -fomit-frame-pointer with FUNCTION_TRACER.
794 ifndef CONFIG_FUNCTION_TRACER
795 KBUILD_CFLAGS += -fomit-frame-pointer
799 # Initialize all stack variables with a 0xAA pattern.
800 ifdef CONFIG_INIT_STACK_ALL_PATTERN
801 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
804 # Initialize all stack variables with a zero value.
805 ifdef CONFIG_INIT_STACK_ALL_ZERO
806 # Future support for zero initialization is still being debated, see
807 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
808 # renamed or dropped.
809 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
810 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
815 # Workaround for GCC versions < 5.0
816 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
817 ifdef CONFIG_CC_IS_GCC
818 DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
821 ifdef CONFIG_DEBUG_INFO
823 ifdef CONFIG_DEBUG_INFO_SPLIT
824 DEBUG_CFLAGS += -gsplit-dwarf
829 ifneq ($(LLVM_IAS),1)
830 KBUILD_AFLAGS += -Wa,-gdwarf-2
833 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
834 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
835 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
836 DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
839 ifdef CONFIG_DEBUG_INFO_REDUCED
840 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
841 $(call cc-option,-fno-var-tracking)
844 ifdef CONFIG_DEBUG_INFO_COMPRESSED
845 DEBUG_CFLAGS += -gz=zlib
846 KBUILD_AFLAGS += -gz=zlib
847 KBUILD_LDFLAGS += --compress-debug-sections=zlib
850 endif # CONFIG_DEBUG_INFO
852 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
855 ifdef CONFIG_FUNCTION_TRACER
856 ifdef CONFIG_FTRACE_MCOUNT_RECORD
857 # gcc 5 supports generating the mcount tables directly
858 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
859 CC_FLAGS_FTRACE += -mrecord-mcount
860 export CC_USING_RECORD_MCOUNT := 1
862 ifdef CONFIG_HAVE_NOP_MCOUNT
863 ifeq ($(call cc-option-yn, -mnop-mcount),y)
864 CC_FLAGS_FTRACE += -mnop-mcount
865 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
869 ifdef CONFIG_HAVE_FENTRY
870 ifeq ($(call cc-option-yn, -mfentry),y)
871 CC_FLAGS_FTRACE += -mfentry
872 CC_FLAGS_USING += -DCC_USING_FENTRY
875 export CC_FLAGS_FTRACE
876 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
877 KBUILD_AFLAGS += $(CC_FLAGS_USING)
878 ifdef CONFIG_DYNAMIC_FTRACE
879 ifdef CONFIG_HAVE_C_RECORDMCOUNT
880 BUILD_C_RECORDMCOUNT := y
881 export BUILD_C_RECORDMCOUNT
886 # We trigger additional mismatches with less inlining
887 ifdef CONFIG_DEBUG_SECTION_MISMATCH
888 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
891 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
892 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
893 LDFLAGS_vmlinux += --gc-sections
896 ifdef CONFIG_SHADOW_CALL_STACK
897 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
898 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
902 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
903 KBUILD_CFLAGS += -falign-functions=32
906 # arch Makefile may override CC so keep this after arch Makefile is included
907 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
909 # warn about C99 declaration after statement
910 KBUILD_CFLAGS += -Wdeclaration-after-statement
912 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
913 KBUILD_CFLAGS += -Wvla
915 # disable pointer signed / unsigned warnings in gcc 4.0
916 KBUILD_CFLAGS += -Wno-pointer-sign
918 # disable stringop warnings in gcc 8+
919 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
921 # We'll want to enable this eventually, but it's not going away for 5.7 at least
922 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
923 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
924 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
926 # Another good warning that we'll want to enable eventually
927 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
929 # Enabled with W=2, disabled by default as noisy
930 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
932 # disable invalid "can't wrap" optimizations for signed / pointers
933 KBUILD_CFLAGS += -fno-strict-overflow
935 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
936 KBUILD_CFLAGS += -fno-stack-check
938 # conserve stack if available
939 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
941 # Prohibit date/time macros, which would make the build non-deterministic
942 KBUILD_CFLAGS += -Werror=date-time
944 # enforce correct pointer usage
945 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
947 # Require designated initializers for all marked structures
948 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
950 # change __FILE__ to the relative path from the srctree
951 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
953 # include additional Makefiles when needed
954 include-y := scripts/Makefile.extrawarn
955 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
956 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
957 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
958 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
959 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
961 include $(addprefix $(srctree)/, $(include-y))
963 # scripts/Makefile.gcc-plugins is intentionally included last.
964 # Do not add $(call cc-option,...) below this line. When you build the kernel
965 # from the clean source tree, the GCC plugins do not exist at this point.
967 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
968 KBUILD_CPPFLAGS += $(KCPPFLAGS)
969 KBUILD_AFLAGS += $(KAFLAGS)
970 KBUILD_CFLAGS += $(KCFLAGS)
972 KBUILD_LDFLAGS_MODULE += --build-id=sha1
973 LDFLAGS_vmlinux += --build-id=sha1
975 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
976 LDFLAGS_vmlinux += $(call ld-option, -X,)
979 ifeq ($(CONFIG_RELR),y)
980 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
983 # We never want expected sections to be placed heuristically by the
984 # linker. All sections should be explicitly named in the linker script.
985 ifdef CONFIG_LD_ORPHAN_WARN
986 LDFLAGS_vmlinux += --orphan-handling=warn
989 # Align the bit size of userspace programs with the kernel
990 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
991 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
993 # make the checker run with the right architecture
994 CHECKFLAGS += --arch=$(ARCH)
996 # insure the checker run with the right endianness
997 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
999 # the checker needs the correct machine size
1000 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1002 # Default kernel image to build when no specific target is given.
1003 # KBUILD_IMAGE may be overruled on the command line or
1004 # set in the environment
1005 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1006 # this default value
1007 export KBUILD_IMAGE ?= vmlinux
1010 # INSTALL_PATH specifies where to place the updated kernel and system map
1011 # images. Default is /boot, but you can set it to other values
1012 export INSTALL_PATH ?= /boot
1015 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1016 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1017 # an argument if needed. Otherwise it defaults to the kernel install path
1019 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1022 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1023 # relocations required by build roots. This is not defined in the
1024 # makefile but the argument can be passed to make if needed.
1027 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1031 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1032 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1033 # the default option --strip-debug will be used. Otherwise,
1034 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1036 ifdef INSTALL_MOD_STRIP
1037 ifeq ($(INSTALL_MOD_STRIP),1)
1038 mod_strip_cmd = $(STRIP) --strip-debug
1040 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1041 endif # INSTALL_MOD_STRIP=1
1043 mod_strip_cmd = true
1044 endif # INSTALL_MOD_STRIP
1045 export mod_strip_cmd
1047 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1048 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1049 # or CONFIG_MODULE_COMPRESS_XZ.
1051 mod_compress_cmd = true
1052 ifdef CONFIG_MODULE_COMPRESS
1053 ifdef CONFIG_MODULE_COMPRESS_GZIP
1054 mod_compress_cmd = $(KGZIP) -n -f
1055 endif # CONFIG_MODULE_COMPRESS_GZIP
1056 ifdef CONFIG_MODULE_COMPRESS_XZ
1057 mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f
1058 endif # CONFIG_MODULE_COMPRESS_XZ
1059 endif # CONFIG_MODULE_COMPRESS
1060 export mod_compress_cmd
1062 ifdef CONFIG_MODULE_SIG_ALL
1063 $(eval $(call config_filename,MODULE_SIG_KEY))
1065 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1071 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1073 has_libelf = $(call try-run,\
1074 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1076 ifdef CONFIG_STACK_VALIDATION
1077 ifeq ($(has_libelf),1)
1078 objtool_target := tools/objtool FORCE
1080 SKIP_STACK_VALIDATION := 1
1081 export SKIP_STACK_VALIDATION
1086 ifdef CONFIG_DEBUG_INFO_BTF
1087 ifeq ($(has_libelf),1)
1088 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1090 ERROR_RESOLVE_BTFIDS := 1
1092 endif # CONFIG_DEBUG_INFO_BTF
1097 export MODORDER := $(extmod-prefix)modules.order
1098 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1100 ifeq ($(KBUILD_EXTMOD),)
1101 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1103 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1104 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1105 $(libs-y) $(libs-m)))
1107 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1108 $(patsubst %/,%,$(filter %/, $(core-) \
1109 $(drivers-) $(libs-))))
1111 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1112 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1113 $(drivers-y) $(drivers-m)))
1115 build-dirs := $(vmlinux-dirs)
1116 clean-dirs := $(vmlinux-alldirs)
1118 # Externally visible symbols (used by link-vmlinux.sh)
1119 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1120 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1121 ifdef CONFIG_MODULES
1122 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1123 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1125 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1127 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1129 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1130 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1131 # used by scripts/Makefile.package
1132 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1134 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1136 # Recurse until adjust_autoksyms.sh is satisfied
1137 PHONY += autoksyms_recursive
1138 ifdef CONFIG_TRIM_UNUSED_KSYMS
1139 # For the kernel to actually contain only the needed exported symbols,
1140 # we have to build modules as well to determine what those symbols are.
1141 # (this can be evaluated only once include/config/auto.conf has been included)
1144 autoksyms_recursive: descend modules.order
1145 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1146 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1149 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1151 quiet_cmd_autoksyms_h = GEN $@
1152 cmd_autoksyms_h = mkdir -p $(dir $@); \
1153 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1156 $(call cmd,autoksyms_h)
1158 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1160 # Final link of vmlinux with optional arch pass after final link
1161 cmd_link-vmlinux = \
1162 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1163 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1165 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1166 +$(call if_changed,link-vmlinux)
1170 # The actual objects are generated when descending,
1171 # make sure no implicit rule kicks in
1172 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1174 filechk_kernel.release = \
1175 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1177 # Store (new) KERNELRELEASE string in include/config/kernel.release
1178 include/config/kernel.release: FORCE
1179 $(call filechk,kernel.release)
1181 # Additional helpers built in scripts/
1182 # Carefully list dependencies so we do not try to build scripts twice
1185 scripts: scripts_basic scripts_dtc
1186 $(Q)$(MAKE) $(build)=$(@)
1188 # Things we need to do before we recursively start building the kernel
1189 # or the modules are listed in "prepare".
1190 # A multi level approach is used. prepareN is processed before prepareN-1.
1191 # archprepare is used in arch Makefiles and when processed asm symlink,
1192 # version.h and scripts_basic is processed / created.
1194 PHONY += prepare archprepare
1196 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1197 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1198 include/generated/autoconf.h
1200 prepare0: archprepare
1201 $(Q)$(MAKE) $(build)=scripts/mod
1202 $(Q)$(MAKE) $(build)=.
1204 # All the preparing..
1205 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1207 # Support for using generic headers in asm-generic
1208 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1210 PHONY += asm-generic uapi-asm-generic
1211 asm-generic: uapi-asm-generic
1212 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1213 generic=include/asm-generic
1215 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1216 generic=include/uapi/asm-generic
1218 PHONY += prepare-objtool prepare-resolve_btfids
1219 prepare-objtool: $(objtool_target)
1220 ifeq ($(SKIP_STACK_VALIDATION),1)
1221 ifdef CONFIG_UNWINDER_ORC
1222 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1225 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1229 prepare-resolve_btfids: $(resolve_btfids_target)
1230 ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1231 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1234 # Generate some files
1235 # ---------------------------------------------------------------------------
1237 # KERNELRELEASE can change from a few different places, meaning version.h
1238 # needs to be updated, so this check is forced on all builds
1241 define filechk_utsrelease.h
1242 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1243 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1246 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1249 define filechk_version.h
1250 if [ $(SUBLEVEL) -gt 255 ]; then \
1251 echo \#define LINUX_VERSION_CODE $(shell \
1252 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255); \
1254 echo \#define LINUX_VERSION_CODE $(shell \
1255 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1257 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1258 ((c) > 255 ? 255 : (c)))'; \
1259 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1260 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1261 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1265 $(call filechk,version.h)
1267 include/generated/utsrelease.h: include/config/kernel.release FORCE
1268 $(call filechk,utsrelease.h)
1272 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1273 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1275 # ---------------------------------------------------------------------------
1278 #Default location for installed headers
1279 export INSTALL_HDR_PATH = $(objtree)/usr
1281 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1282 cmd_headers_install = \
1283 mkdir -p $(INSTALL_HDR_PATH); \
1284 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1285 usr/include $(INSTALL_HDR_PATH)
1287 PHONY += headers_install
1288 headers_install: headers
1289 $(call cmd,headers_install)
1291 PHONY += archheaders archscripts
1293 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1296 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1297 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1298 $(error Headers not exportable for the $(SRCARCH) architecture))
1299 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1300 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1302 # Deprecated. It is no-op now.
1303 PHONY += headers_check
1307 ifdef CONFIG_HEADERS_INSTALL
1311 PHONY += scripts_unifdef
1312 scripts_unifdef: scripts_basic
1313 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1315 # ---------------------------------------------------------------------------
1320 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1323 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1325 PHONY += kselftest-merge
1327 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1328 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1329 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1330 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1332 # ---------------------------------------------------------------------------
1335 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1336 dtstree := arch/$(SRCARCH)/boot/dts
1341 %.dtb: include/config/kernel.release scripts_dtc
1342 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1344 PHONY += dtbs dtbs_install dtbs_check
1345 dtbs: include/config/kernel.release scripts_dtc
1346 $(Q)$(MAKE) $(build)=$(dtstree)
1348 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1350 dtbs: dt_binding_check
1356 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1358 ifdef CONFIG_OF_EARLY_FLATTREE
1364 PHONY += scripts_dtc
1365 scripts_dtc: scripts_basic
1366 $(Q)$(MAKE) $(build)=scripts/dtc
1368 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1369 export CHECK_DT_BINDING=y
1372 PHONY += dt_binding_check
1373 dt_binding_check: scripts_dtc
1374 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1376 # ---------------------------------------------------------------------------
1379 ifdef CONFIG_MODULES
1381 # By default, build modules as well
1385 # When we're building modules with modversions, we need to consider
1386 # the built-in objects during the descend as well, in order to
1387 # make sure the checksums are up to date before we record them.
1388 ifdef CONFIG_MODVERSIONS
1394 # A module can be listed more than once in obj-m resulting in
1395 # duplicate lines in modules.order files. Those are removed
1396 # using awk while concatenating to the final file.
1399 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1400 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1402 PHONY += modules_check
1403 modules_check: modules.order
1404 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1406 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1408 modules.order: $(subdir-modorder) FORCE
1409 $(call if_changed,modules_order)
1411 targets += modules.order
1413 # Target to prepare building external modules
1414 PHONY += modules_prepare
1415 modules_prepare: prepare
1416 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1418 # Target to install modules
1419 PHONY += modules_install
1420 modules_install: _modinst_ _modinst_post
1424 @rm -rf $(MODLIB)/kernel
1425 @rm -f $(MODLIB)/source
1426 @mkdir -p $(MODLIB)/kernel
1427 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1428 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1429 rm -f $(MODLIB)/build ; \
1430 ln -s $(CURDIR) $(MODLIB)/build ; \
1432 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1433 @cp -f modules.builtin $(MODLIB)/
1434 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1435 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1437 # This depmod is only for convenience to give the initial
1438 # boot a modules.dep even before / is mounted read-write. However the
1439 # boot script depmod is the master version.
1440 PHONY += _modinst_post
1441 _modinst_post: _modinst_
1444 ifeq ($(CONFIG_MODULE_SIG), y)
1445 PHONY += modules_sign
1447 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1450 else # CONFIG_MODULES
1452 # Modules not configured
1453 # ---------------------------------------------------------------------------
1455 PHONY += modules modules_install
1456 modules modules_install:
1458 @echo >&2 "The present kernel configuration has modules disabled."
1459 @echo >&2 "Type 'make config' and enable loadable module support."
1460 @echo >&2 "Then build a kernel with module support enabled."
1464 endif # CONFIG_MODULES
1467 # Cleaning is done on three levels.
1468 # make clean Delete most generated files
1469 # Leave enough to build external modules
1470 # make mrproper Delete the current configuration, and all generated files
1471 # make distclean Remove editor backup files, patch leftover files and the like
1473 # Directories & files removed with 'make clean'
1474 CLEAN_FILES += include/ksym vmlinux.symvers \
1475 modules.builtin modules.builtin.modinfo modules.nsdeps \
1476 compile_commands.json
1478 # Directories & files removed with 'make mrproper'
1479 MRPROPER_FILES += include/config include/generated \
1480 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1481 debian snap tar-install \
1482 .config .config.old .version \
1484 signing_key.pem signing_key.priv signing_key.x509 \
1485 x509.genkey extra_certificates signing_key.x509.keyid \
1486 signing_key.x509.signer vmlinux-gdb.py \
1489 # Directories & files removed with 'make distclean'
1490 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1492 # clean - Delete most, but leave enough to build external modules
1494 clean: rm-files := $(CLEAN_FILES)
1496 PHONY += archclean vmlinuxclean
1499 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1500 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1502 clean: archclean vmlinuxclean
1504 # mrproper - Delete all generated files, including .config
1506 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1507 mrproper-dirs := $(addprefix _mrproper_,scripts)
1509 PHONY += $(mrproper-dirs) mrproper
1511 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1513 mrproper: clean $(mrproper-dirs)
1518 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1524 @find $(srctree) $(RCS_FIND_IGNORE) \
1525 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1526 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1527 -o -name 'core' \) \
1528 -type f -print | xargs rm -f
1531 # Packaging of the kernel to various formats
1532 # ---------------------------------------------------------------------------
1535 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1536 %pkg: include/config/kernel.release FORCE
1537 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1539 # Brief documentation of the typical targets used
1540 # ---------------------------------------------------------------------------
1542 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1543 boards := $(sort $(notdir $(boards)))
1544 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1545 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1549 @echo 'Cleaning targets:'
1550 @echo ' clean - Remove most generated files but keep the config and'
1551 @echo ' enough build support to build external modules'
1552 @echo ' mrproper - Remove all generated files + config + various backup files'
1553 @echo ' distclean - mrproper + remove editor backup and patch files'
1555 @echo 'Configuration targets:'
1556 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1558 @echo 'Other generic targets:'
1559 @echo ' all - Build all targets marked with [*]'
1560 @echo '* vmlinux - Build the bare kernel'
1561 @echo '* modules - Build all modules'
1562 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1563 @echo ' dir/ - Build all files in dir and below'
1564 @echo ' dir/file.[ois] - Build specified target only'
1565 @echo ' dir/file.ll - Build the LLVM assembly file'
1566 @echo ' (requires compiler support for LLVM assembly generation)'
1567 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1568 @echo ' (requires a recent binutils and recent build (System.map))'
1569 @echo ' dir/file.ko - Build module including final link'
1570 @echo ' modules_prepare - Set up for building external modules'
1571 @echo ' tags/TAGS - Generate tags file for editors'
1572 @echo ' cscope - Generate cscope index'
1573 @echo ' gtags - Generate GNU GLOBAL index'
1574 @echo ' kernelrelease - Output the release version string (use with make -s)'
1575 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1576 @echo ' image_name - Output the image name (use with make -s)'
1577 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1578 echo ' (default: $(INSTALL_HDR_PATH))'; \
1580 @echo 'Static analysers:'
1581 @echo ' checkstack - Generate a list of stack hogs'
1582 @echo ' versioncheck - Sanity check on version.h usage'
1583 @echo ' includecheck - Check for duplicate included header files'
1584 @echo ' export_report - List the usages of all exported symbols'
1585 @echo ' headerdep - Detect inclusion cycles in headers'
1586 @echo ' coccicheck - Check with Coccinelle'
1587 @echo ' clang-analyzer - Check with clang static analyzer'
1588 @echo ' clang-tidy - Check with clang-tidy'
1591 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1593 @echo 'Kernel selftest:'
1594 @echo ' kselftest - Build and run kernel selftest'
1595 @echo ' Build, install, and boot kernel before'
1596 @echo ' running kselftest on it'
1597 @echo ' Run as root for full coverage'
1598 @echo ' kselftest-all - Build kernel selftest'
1599 @echo ' kselftest-install - Build and install kernel selftest'
1600 @echo ' kselftest-clean - Remove all generated kselftest files'
1601 @echo ' kselftest-merge - Merge all the config dependencies of'
1602 @echo ' kselftest to existing .config.'
1605 echo 'Devicetree:'; \
1606 echo '* dtbs - Build device tree blobs for enabled boards'; \
1607 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1608 echo ' dt_binding_check - Validate device tree binding documents'; \
1609 echo ' dtbs_check - Validate device tree source files';\
1612 @echo 'Userspace tools targets:'
1613 @echo ' use "make tools/help"'
1614 @echo ' or "cd tools; make help"'
1616 @echo 'Kernel packaging:'
1617 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1619 @echo 'Documentation targets:'
1620 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1622 @echo 'Architecture specific targets ($(SRCARCH)):'
1623 @$(if $(archhelp),$(archhelp),\
1624 echo ' No architecture specific help defined for $(SRCARCH)')
1627 $(foreach b, $(boards), \
1628 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1630 @$(if $(board-dirs), \
1631 $(foreach b, $(board-dirs), \
1632 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1633 printf " %-16s - Show all of the above\\n" help-boards; \
1636 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1637 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1638 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1639 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1640 @echo ' (sparse by default)'
1641 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1642 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1643 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1644 @echo ' 1: warnings which may be relevant and do not occur too often'
1645 @echo ' 2: warnings which occur quite often but may still be relevant'
1646 @echo ' 3: more obscure warnings, can most likely be ignored'
1647 @echo ' Multiple levels can be combined with W=12 or W=123'
1649 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1650 @echo 'For further info see the ./README file'
1653 help-board-dirs := $(addprefix help-,$(board-dirs))
1655 help-boards: $(help-board-dirs)
1657 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1659 $(help-board-dirs): help-%:
1660 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1661 @$(if $(boards-per-dir), \
1662 $(foreach b, $(boards-per-dir), \
1663 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1667 # Documentation targets
1668 # ---------------------------------------------------------------------------
1669 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1670 linkcheckdocs dochelp refcheckdocs
1671 PHONY += $(DOC_TARGETS)
1673 $(Q)$(MAKE) $(build)=Documentation $@
1676 # ---------------------------------------------------------------------------
1678 PHONY += scripts_gdb
1679 scripts_gdb: prepare0
1680 $(Q)$(MAKE) $(build)=scripts/gdb
1681 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1683 ifdef CONFIG_GDB_SCRIPTS
1687 else # KBUILD_EXTMOD
1690 # External module support.
1691 # When building external modules the kernel used as basis is considered
1692 # read-only, and no consistency checks are made and the make
1693 # system is not used on the basis kernel. If updates are required
1694 # in the basis kernel ordinary make commands (without M=...) must
1697 # The following are the only valid targets when building external
1699 # make M=dir clean Delete all automatically generated files
1700 # make M=dir modules Make all modules in specified dir
1701 # make M=dir Same as 'make M=dir modules'
1702 # make M=dir modules_install
1703 # Install the modules built in the module directory
1704 # Assumes install directory is already created
1706 # We are always building only modules.
1710 build-dirs := $(KBUILD_EXTMOD)
1712 modules: $(MODORDER)
1713 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1715 $(MODORDER): descend
1718 PHONY += modules_install
1719 modules_install: _emodinst_ _emodinst_post
1721 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1724 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1725 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1727 PHONY += _emodinst_post
1728 _emodinst_post: _emodinst_
1731 compile_commands.json: $(extmod-prefix)compile_commands.json
1732 PHONY += compile_commands.json
1734 clean-dirs := $(KBUILD_EXTMOD)
1735 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1736 $(KBUILD_EXTMOD)/compile_commands.json
1740 @echo ' Building external modules.'
1741 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1743 @echo ' modules - default target, build the module(s)'
1744 @echo ' modules_install - install the module'
1745 @echo ' clean - remove generated files in module directory only'
1748 # no-op for external module builds
1749 PHONY += prepare modules_prepare
1751 endif # KBUILD_EXTMOD
1754 # ---------------------------------------------------------------------------
1755 # To build individual files in subdirectories, you can do like this:
1757 # make foo/bar/baz.s
1759 # The supported suffixes for single-target are listed in 'single-targets'
1761 # To build only under specific subdirectories, you can do like this:
1767 # .ko is special because modpost is needed
1768 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1769 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1771 $(single-ko): single_modpost
1773 $(single-no-ko): descend
1776 ifeq ($(KBUILD_EXTMOD),)
1777 # For the single build of in-tree modules, use a temporary file to avoid
1778 # the situation of modules_install installing an invalid modules.order.
1779 MODORDER := .modules.tmp
1782 PHONY += single_modpost
1783 single_modpost: $(single-no-ko) modules_prepare
1784 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1785 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1789 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1791 # trim unrelated directories
1792 build-dirs := $(foreach d, $(build-dirs), \
1793 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1797 ifndef CONFIG_MODULES
1801 # Handle descending into subdirectories listed in $(build-dirs)
1802 # Preset locale variables to speed up the build process. Limit locale
1803 # tweaks to this spot to avoid wrong language settings when running
1804 # make menuconfig etc.
1805 # Error messages still appears in the original language
1806 PHONY += descend $(build-dirs)
1807 descend: $(build-dirs)
1808 $(build-dirs): prepare
1809 $(Q)$(MAKE) $(build)=$@ \
1810 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1811 need-builtin=1 need-modorder=1
1813 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1814 PHONY += $(clean-dirs) clean
1816 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1818 clean: $(clean-dirs)
1820 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1821 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1823 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1824 -o -name '*.dwo' -o -name '*.lst' \
1825 -o -name '*.su' -o -name '*.mod' \
1826 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1827 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1828 -o -name '*.asn1.[ch]' \
1829 -o -name '*.symtypes' -o -name 'modules.order' \
1830 -o -name '.tmp_*.o.*' \
1831 -o -name '*.c.[012]*.*' \
1833 -o -name '*.gcno' \) -type f -print | xargs rm -f
1835 # Generate tags for editors
1836 # ---------------------------------------------------------------------------
1837 quiet_cmd_tags = GEN $@
1838 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1840 tags TAGS cscope gtags: FORCE
1843 # Script to generate missing namespace dependencies
1844 # ---------------------------------------------------------------------------
1847 nsdeps: export KBUILD_NSDEPS=1
1849 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1852 # ---------------------------------------------------------------------------
1854 quiet_cmd_gen_compile_commands = GEN $@
1855 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1857 $(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1858 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1859 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1860 $(call if_changed,gen_compile_commands)
1862 targets += $(extmod-prefix)compile_commands.json
1864 PHONY += clang-tidy clang-analyzer
1866 ifdef CONFIG_CC_IS_CLANG
1867 quiet_cmd_clang_tools = CHECK $<
1868 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1870 clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1871 $(call cmd,clang_tools)
1873 clang-tidy clang-analyzer:
1874 @echo "$@ requires CC=clang" >&2
1878 # Scripts to check various things for consistency
1879 # ---------------------------------------------------------------------------
1881 PHONY += includecheck versioncheck coccicheck export_report
1884 find $(srctree)/* $(RCS_FIND_IGNORE) \
1885 -name '*.[hcS]' -type f -print | sort \
1886 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1889 find $(srctree)/* $(RCS_FIND_IGNORE) \
1890 -name '*.[hcS]' -type f -print | sort \
1891 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1894 $(Q)$(BASH) $(srctree)/scripts/$@
1897 $(PERL) $(srctree)/scripts/export_report.pl
1899 PHONY += checkstack kernelrelease kernelversion image_name
1901 # UML needs a little special treatment here. It wants to use the host
1902 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1903 # else wants $(ARCH), including people doing cross-builds, which means
1904 # that $(SUBARCH) doesn't work here.
1906 CHECKSTACK_ARCH := $(SUBARCH)
1908 CHECKSTACK_ARCH := $(ARCH)
1911 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1912 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1915 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1918 @echo $(KERNELVERSION)
1921 @echo $(KBUILD_IMAGE)
1923 # Clear a bunch of variables before executing the submake
1925 ifeq ($(quiet),silent_)
1930 $(Q)mkdir -p $(objtree)/tools
1931 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1934 $(Q)mkdir -p $(objtree)/tools
1935 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1937 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1938 cmd_rmfiles = rm -rf $(rm-files)
1940 # Run depmod only if we have System.map and depmod is executable
1941 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1942 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1945 # read saved command lines for existing targets
1946 existing-targets := $(wildcard $(sort $(targets)))
1948 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1950 endif # config-build
1952 endif # need-sub-make
1957 # Declare the contents of the PHONY variable as phony. We keep that
1958 # information in a variable so we can use it in if_changed and friends.