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 this-makefile := $(lastword $(MAKEFILE_LIST))
149 abs_srctree := $(realpath $(dir $(this-makefile)))
151 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
152 $(error source directory cannot contain spaces or colons)
155 ifneq ($(abs_srctree),$(abs_objtree))
156 # Look for make include files relative to root of kernel src
158 # This does not become effective immediately because MAKEFLAGS is re-parsed
159 # once after the Makefile is read. We need to invoke sub-make.
160 MAKEFLAGS += --include-dir=$(abs_srctree)
164 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
165 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
166 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
168 # Cancel implicit rules for this Makefile.
172 export abs_srctree abs_objtree
173 export sub_make_done := 1
175 ifeq ($(need-sub-make),1)
177 PHONY += $(MAKECMDGOALS) __sub-make
179 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
182 # Invoke a second make in the output directory, passing relevant variables
184 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
186 endif # need-sub-make
187 endif # sub_make_done
189 # We process the rest of the Makefile if this is the final invocation of make
190 ifeq ($(need-sub-make),)
192 # Do not print "Entering directory ...",
193 # but we want to display it when entering to the output directory
194 # so that IDEs/editors are able to understand relative filenames.
195 MAKEFLAGS += --no-print-directory
197 # Call a source code checker (by default, "sparse") as part of the
200 # Use 'make C=1' to enable checking of only re-compiled files.
201 # Use 'make C=2' to enable checking of *all* source files, regardless
202 # of whether they are re-compiled or not.
204 # See the file "Documentation/dev-tools/sparse.rst" for more details,
205 # including where to get the "sparse" utility.
207 ifeq ("$(origin C)", "command line")
208 KBUILD_CHECKSRC = $(C)
210 ifndef KBUILD_CHECKSRC
214 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
215 # directory of external module to build. Setting M= takes precedence.
216 ifeq ("$(origin M)", "command line")
217 KBUILD_EXTMOD := $(M)
220 $(if $(word 2, $(KBUILD_EXTMOD)), \
221 $(error building multiple external modules is not supported))
223 export KBUILD_CHECKSRC KBUILD_EXTMOD
225 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
227 ifeq ($(abs_srctree),$(abs_objtree))
228 # building in the source tree
230 building_out_of_srctree :=
232 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
233 # building in a subdirectory of the source tree
236 srctree := $(abs_srctree)
238 building_out_of_srctree := 1
241 ifneq ($(KBUILD_ABS_SRCTREE),)
242 srctree := $(abs_srctree)
248 export building_out_of_srctree srctree objtree VPATH
250 # To make sure we do not include .config for any of the *config targets
251 # catch them early, and hand them over to scripts/kconfig/Makefile
252 # It is allowed to specify more targets when calling make, including
253 # mixing *config targets and build targets.
254 # For example 'make oldconfig all'.
255 # Detect when mixed targets is specified, and make a second invocation
256 # of make so .config is not included in this case either (for *config).
258 version_h := include/generated/uapi/linux/version.h
260 clean-targets := %clean mrproper cleandocs
261 no-dot-config-targets := $(clean-targets) \
262 cscope gtags TAGS tags help% %docs check% coccicheck \
263 $(version_h) headers headers_% archheaders archscripts \
264 %asm-generic kernelversion %src-pkg dt_binding_check \
266 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease
267 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
275 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
276 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
281 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
282 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
287 ifneq ($(KBUILD_EXTMOD),)
291 ifeq ($(KBUILD_EXTMOD),)
292 ifneq ($(filter %config,$(MAKECMDGOALS)),)
294 ifneq ($(words $(MAKECMDGOALS)),1)
300 # We cannot build single targets and the others at the same time
301 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
303 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
308 # For "make -j clean all", "make -j mrproper defconfig all", etc.
309 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
310 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
315 # install and modules_install need also be processed one by one
316 ifneq ($(filter install,$(MAKECMDGOALS)),)
317 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
323 # ===========================================================================
324 # We're called with mixed targets (*config and build targets).
325 # Handle them one by one.
327 PHONY += $(MAKECMDGOALS) __build_one_by_one
329 $(MAKECMDGOALS): __build_one_by_one
334 for i in $(MAKECMDGOALS); do \
335 $(MAKE) -f $(srctree)/Makefile $$i; \
340 include scripts/Kbuild.include
342 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
343 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
344 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
345 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
347 include scripts/subarch.include
349 # Cross compiling and selecting different set of gcc/bin-utils
350 # ---------------------------------------------------------------------------
352 # When performing cross compilation for other architectures ARCH shall be set
353 # to the target architecture. (See arch/* for the possibilities).
354 # ARCH can be set during invocation of make:
356 # Another way is to have ARCH set in the environment.
357 # The default ARCH is the host where make is executed.
359 # CROSS_COMPILE specify the prefix used for all executables used
360 # during compilation. Only gcc and related bin-utils executables
361 # are prefixed with $(CROSS_COMPILE).
362 # CROSS_COMPILE can be set on the command line
363 # make CROSS_COMPILE=ia64-linux-
364 # Alternatively CROSS_COMPILE can be set in the environment.
365 # Default value for CROSS_COMPILE is not to prefix executables
366 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
369 # Architecture as present in compile.h
370 UTS_MACHINE := $(ARCH)
373 # Additional ARCH settings for x86
377 ifeq ($(ARCH),x86_64)
381 # Additional ARCH settings for sparc
382 ifeq ($(ARCH),sparc32)
385 ifeq ($(ARCH),sparc64)
389 # Additional ARCH settings for sh
394 KCONFIG_CONFIG ?= .config
395 export KCONFIG_CONFIG
397 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
398 export KBUILD_DEFCONFIG := defconfig
400 # SHELL used by kbuild
403 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
404 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
405 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
415 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
416 -O2 -fomit-frame-pointer -std=gnu89
417 export KBUILD_USERLDFLAGS :=
419 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
420 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
421 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
422 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
424 # Make variables (CC, etc...)
431 OBJCOPY = llvm-objcopy
432 OBJDUMP = llvm-objdump
433 READELF = llvm-readelf
436 CC = $(CROSS_COMPILE)gcc
437 LD = $(CROSS_COMPILE)ld
438 AR = $(CROSS_COMPILE)ar
439 NM = $(CROSS_COMPILE)nm
440 OBJCOPY = $(CROSS_COMPILE)objcopy
441 OBJDUMP = $(CROSS_COMPILE)objdump
442 READELF = $(CROSS_COMPILE)readelf
443 STRIP = $(CROSS_COMPILE)strip
446 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
450 INSTALLKERNEL := installkernel
464 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
465 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
474 # Use USERINCLUDE when you must reference the UAPI directories only.
476 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
477 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
478 -I$(srctree)/include/uapi \
479 -I$(objtree)/include/generated/uapi \
480 -include $(srctree)/include/linux/kconfig.h
482 # Use LINUXINCLUDE when you must reference the include/ directory.
483 # Needed to be compatible with the O= option
485 -I$(srctree)/arch/$(SRCARCH)/include \
486 -I$(objtree)/arch/$(SRCARCH)/include/generated \
487 $(if $(building_out_of_srctree),-I$(srctree)/include) \
488 -I$(objtree)/include \
491 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
492 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
493 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
494 -Werror=implicit-function-declaration -Werror=implicit-int \
495 -Werror=return-type -Wno-format-security \
497 KBUILD_CPPFLAGS := -D__KERNEL__
498 KBUILD_AFLAGS_KERNEL :=
499 KBUILD_CFLAGS_KERNEL :=
500 KBUILD_AFLAGS_MODULE := -DMODULE
501 KBUILD_CFLAGS_MODULE := -DMODULE
502 KBUILD_LDFLAGS_MODULE :=
506 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
507 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
508 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
509 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
510 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
512 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
513 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
514 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
515 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
516 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
518 # Files to ignore in find ... statements
520 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
521 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
523 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
524 --exclude CVS --exclude .pc --exclude .hg --exclude .git
526 # ===========================================================================
527 # Rules shared between *config targets and build targets
529 # Basic helpers built in scripts/basic/
530 PHONY += scripts_basic
532 $(Q)$(MAKE) $(build)=scripts/basic
533 $(Q)rm -f .tmp_quiet_recordmcount
535 PHONY += outputmakefile
536 # Before starting out-of-tree build, make sure the source tree is clean.
537 # outputmakefile generates a Makefile in the output directory, if using a
538 # separate output directory. This allows convenient use of make in the
540 # At the same time when output Makefile generated, generate .gitignore to
541 # ignore whole output directory
543 ifdef building_out_of_srctree
544 $(Q)if [ -f $(srctree)/.config -o \
545 -d $(srctree)/include/config -o \
546 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
548 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
549 echo >&2 "*** in $(abs_srctree)";\
553 $(Q)ln -fsn $(srctree) source
554 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
555 $(Q)test -e .gitignore || \
556 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
559 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
560 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
561 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
562 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
563 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1 | sed 's/\#//g')
565 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
566 ifneq ($(CROSS_COMPILE),)
567 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
568 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
569 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
570 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
572 ifneq ($(GCC_TOOLCHAIN),)
573 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
575 ifneq ($(LLVM_IAS),1)
576 CLANG_FLAGS += -no-integrated-as
578 CLANG_FLAGS += -Werror=unknown-warning-option
579 KBUILD_CFLAGS += $(CLANG_FLAGS)
580 KBUILD_AFLAGS += $(CLANG_FLAGS)
585 # ===========================================================================
586 # *config targets only - make sure prerequisites are updated, and descend
587 # in scripts/kconfig to make the *config target
589 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
590 # KBUILD_DEFCONFIG may point out an alternative default configuration
591 # used for 'make defconfig'
592 include arch/$(SRCARCH)/Makefile
593 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
595 config: outputmakefile scripts_basic FORCE
596 $(Q)$(MAKE) $(build)=scripts/kconfig $@
598 %config: outputmakefile scripts_basic FORCE
599 $(Q)$(MAKE) $(build)=scripts/kconfig $@
602 # ===========================================================================
603 # Build targets only - this includes vmlinux, arch specific targets, clean
604 # targets and others. In general all targets except *config targets.
606 # If building an external module we do not care about the all: rule
607 # but instead __all depend on modules
609 ifeq ($(KBUILD_EXTMOD),)
615 # Decide whether to build built-in, modular, or both.
616 # Normally, just do built-in.
621 # If we have only "make modules", don't compile built-in objects.
622 ifeq ($(MAKECMDGOALS),modules)
626 # If we have "make <whatever> modules", compile modules
627 # in addition to whatever we do anyway.
628 # Just "make" or "make all" shall build modules as well
630 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
634 ifeq ($(MAKECMDGOALS),)
638 export KBUILD_MODULES KBUILD_BUILTIN
641 include include/config/auto.conf
644 ifeq ($(KBUILD_EXTMOD),)
645 # Objects we will link into vmlinux / subdirs we need to visit
647 drivers-y := drivers/ sound/
648 drivers-$(CONFIG_SAMPLES) += samples/
649 drivers-y += net/ virt/
651 endif # KBUILD_EXTMOD
653 # The all: target is the default when no target is given on the
655 # This allow a user to issue only 'make' to build a kernel including modules
656 # Defaults to vmlinux, but the arch makefile usually adds further targets
659 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
660 $(call cc-option,-fno-tree-loop-im) \
661 $(call cc-disable-warning,maybe-uninitialized,)
664 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
665 ifdef CONFIG_FUNCTION_TRACER
666 CC_FLAGS_FTRACE := -pg
669 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
670 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
671 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
672 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
673 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
674 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
675 export RETPOLINE_CFLAGS
676 export RETPOLINE_VDSO_CFLAGS
678 include arch/$(SRCARCH)/Makefile
681 ifdef may-sync-config
682 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
683 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
684 # because some architectures define CROSS_COMPILE there.
685 include include/config/auto.conf.cmd
689 @echo >&2 '*** Configuration file "$@" not found!'
691 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
692 @echo >&2 '*** "make menuconfig" or "make xconfig").'
696 # The actual configuration files used during the build are stored in
697 # include/generated/ and include/config/. Update them if .config is newer than
698 # include/config/auto.conf (which mirrors .config).
700 # This exploits the 'multi-target pattern rule' trick.
701 # The syncconfig should be executed only once to make all the targets.
702 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
703 quiet_cmd_syncconfig = SYNC $@
704 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig
706 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
707 +$(call cmd,syncconfig)
708 else # !may-sync-config
709 # External modules and some install targets need include/generated/autoconf.h
710 # and include/config/auto.conf but do not care if they are up-to-date.
711 # Use auto.conf to trigger the test
712 PHONY += include/config/auto.conf
714 include/config/auto.conf:
715 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
717 echo >&2 " ERROR: Kernel configuration is invalid."; \
718 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
719 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
723 endif # may-sync-config
726 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
727 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
728 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
729 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
730 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
732 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
734 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
736 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
740 # Tell gcc to never replace conditional load with a non-conditional one
741 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
742 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
744 ifdef CONFIG_READABLE_ASM
745 # Disable optimizations that make assembler listings hard to read.
746 # reorder blocks reorders the control in the function
747 # ipa clone creates specialized cloned functions
748 # partial inlining inlines only parts of functions
749 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
750 $(call cc-option,-fno-ipa-cp-clone,) \
751 $(call cc-option,-fno-partial-inlining)
754 ifneq ($(CONFIG_FRAME_WARN),0)
755 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
758 stackp-flags-y := -fno-stack-protector
759 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
760 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
762 KBUILD_CFLAGS += $(stackp-flags-y)
764 ifdef CONFIG_CC_IS_CLANG
765 KBUILD_CPPFLAGS += -Qunused-arguments
766 KBUILD_CFLAGS += -Wno-format-invalid-specifier
767 KBUILD_CFLAGS += -Wno-gnu
768 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
769 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
770 # See modpost pattern 2
771 KBUILD_CFLAGS += -mno-global-merge
774 # These warnings generated too much noise in a regular build.
775 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
776 KBUILD_CFLAGS += -Wno-unused-but-set-variable
778 # Warn about unmarked fall-throughs in switch statement.
779 # Disabled for clang while comment to attribute conversion happens and
780 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
781 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
784 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
785 ifdef CONFIG_FRAME_POINTER
786 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
788 # Some targets (ARM with Thumb2, for example), can't be built with frame
789 # pointers. For those, we don't have FUNCTION_TRACER automatically
790 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
791 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
792 # -fomit-frame-pointer with FUNCTION_TRACER.
793 ifndef CONFIG_FUNCTION_TRACER
794 KBUILD_CFLAGS += -fomit-frame-pointer
798 # Initialize all stack variables with a 0xAA pattern.
799 ifdef CONFIG_INIT_STACK_ALL_PATTERN
800 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
803 # Initialize all stack variables with a zero value.
804 ifdef CONFIG_INIT_STACK_ALL_ZERO
805 # Future support for zero initialization is still being debated, see
806 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
807 # renamed or dropped.
808 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
809 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
814 # Workaround for GCC versions < 5.0
815 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
816 ifdef CONFIG_CC_IS_GCC
817 DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
820 ifdef CONFIG_DEBUG_INFO
822 ifdef CONFIG_DEBUG_INFO_SPLIT
823 DEBUG_CFLAGS += -gsplit-dwarf
828 ifneq ($(LLVM_IAS),1)
829 KBUILD_AFLAGS += -Wa,-gdwarf-2
832 ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
833 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
834 dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
835 DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
838 ifdef CONFIG_DEBUG_INFO_REDUCED
839 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
840 $(call cc-option,-fno-var-tracking)
843 ifdef CONFIG_DEBUG_INFO_COMPRESSED
844 DEBUG_CFLAGS += -gz=zlib
845 KBUILD_AFLAGS += -gz=zlib
846 KBUILD_LDFLAGS += --compress-debug-sections=zlib
849 endif # CONFIG_DEBUG_INFO
851 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
854 ifdef CONFIG_FUNCTION_TRACER
855 ifdef CONFIG_FTRACE_MCOUNT_RECORD
856 # gcc 5 supports generating the mcount tables directly
857 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
858 CC_FLAGS_FTRACE += -mrecord-mcount
859 export CC_USING_RECORD_MCOUNT := 1
861 ifdef CONFIG_HAVE_NOP_MCOUNT
862 ifeq ($(call cc-option-yn, -mnop-mcount),y)
863 CC_FLAGS_FTRACE += -mnop-mcount
864 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
868 ifdef CONFIG_HAVE_FENTRY
869 ifeq ($(call cc-option-yn, -mfentry),y)
870 CC_FLAGS_FTRACE += -mfentry
871 CC_FLAGS_USING += -DCC_USING_FENTRY
874 export CC_FLAGS_FTRACE
875 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
876 KBUILD_AFLAGS += $(CC_FLAGS_USING)
877 ifdef CONFIG_DYNAMIC_FTRACE
878 ifdef CONFIG_HAVE_C_RECORDMCOUNT
879 BUILD_C_RECORDMCOUNT := y
880 export BUILD_C_RECORDMCOUNT
885 # We trigger additional mismatches with less inlining
886 ifdef CONFIG_DEBUG_SECTION_MISMATCH
887 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
890 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
891 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
892 LDFLAGS_vmlinux += --gc-sections
895 ifdef CONFIG_SHADOW_CALL_STACK
896 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
897 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
901 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
902 KBUILD_CFLAGS += -falign-functions=32
905 # arch Makefile may override CC so keep this after arch Makefile is included
906 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
908 # warn about C99 declaration after statement
909 KBUILD_CFLAGS += -Wdeclaration-after-statement
911 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
912 KBUILD_CFLAGS += -Wvla
914 # disable pointer signed / unsigned warnings in gcc 4.0
915 KBUILD_CFLAGS += -Wno-pointer-sign
917 # disable stringop warnings in gcc 8+
918 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
920 # We'll want to enable this eventually, but it's not going away for 5.7 at least
921 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
922 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
923 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
925 # Another good warning that we'll want to enable eventually
926 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
928 # Enabled with W=2, disabled by default as noisy
929 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
931 # disable invalid "can't wrap" optimizations for signed / pointers
932 KBUILD_CFLAGS += -fno-strict-overflow
934 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
935 KBUILD_CFLAGS += -fno-stack-check
937 # conserve stack if available
938 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
940 # Prohibit date/time macros, which would make the build non-deterministic
941 KBUILD_CFLAGS += -Werror=date-time
943 # enforce correct pointer usage
944 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
946 # Require designated initializers for all marked structures
947 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
949 # change __FILE__ to the relative path from the srctree
950 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
952 # include additional Makefiles when needed
953 include-y := scripts/Makefile.extrawarn
954 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
955 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
956 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
957 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
958 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
960 include $(addprefix $(srctree)/, $(include-y))
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.
966 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
967 KBUILD_CPPFLAGS += $(KCPPFLAGS)
968 KBUILD_AFLAGS += $(KAFLAGS)
969 KBUILD_CFLAGS += $(KCFLAGS)
971 KBUILD_LDFLAGS_MODULE += --build-id=sha1
972 LDFLAGS_vmlinux += --build-id=sha1
974 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
975 LDFLAGS_vmlinux += $(call ld-option, -X,)
978 ifeq ($(CONFIG_RELR),y)
979 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
982 # We never want expected sections to be placed heuristically by the
983 # linker. All sections should be explicitly named in the linker script.
984 ifdef CONFIG_LD_ORPHAN_WARN
985 LDFLAGS_vmlinux += --orphan-handling=warn
988 # Align the bit size of userspace programs with the kernel
989 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
990 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
992 # make the checker run with the right architecture
993 CHECKFLAGS += --arch=$(ARCH)
995 # insure the checker run with the right endianness
996 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
998 # the checker needs the correct machine size
999 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1001 # Default kernel image to build when no specific target is given.
1002 # KBUILD_IMAGE may be overruled on the command line or
1003 # set in the environment
1004 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1005 # this default value
1006 export KBUILD_IMAGE ?= vmlinux
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
1011 export INSTALL_PATH ?= /boot
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
1018 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
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.
1026 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
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.
1035 ifdef INSTALL_MOD_STRIP
1036 ifeq ($(INSTALL_MOD_STRIP),1)
1037 mod_strip_cmd = $(STRIP) --strip-debug
1039 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1040 endif # INSTALL_MOD_STRIP=1
1042 mod_strip_cmd = true
1043 endif # INSTALL_MOD_STRIP
1044 export mod_strip_cmd
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.
1050 mod_compress_cmd = true
1051 ifdef 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) --lzma2=dict=2MiB -f
1057 endif # CONFIG_MODULE_COMPRESS_XZ
1058 endif # CONFIG_MODULE_COMPRESS
1059 export mod_compress_cmd
1061 ifdef CONFIG_MODULE_SIG_ALL
1062 $(eval $(call config_filename,MODULE_SIG_KEY))
1064 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1070 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1072 has_libelf = $(call try-run,\
1073 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1075 ifdef CONFIG_STACK_VALIDATION
1076 ifeq ($(has_libelf),1)
1077 objtool_target := tools/objtool FORCE
1079 SKIP_STACK_VALIDATION := 1
1080 export SKIP_STACK_VALIDATION
1085 ifdef CONFIG_DEBUG_INFO_BTF
1086 ifeq ($(has_libelf),1)
1087 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1089 ERROR_RESOLVE_BTFIDS := 1
1091 endif # CONFIG_DEBUG_INFO_BTF
1096 export MODORDER := $(extmod-prefix)modules.order
1097 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1099 ifeq ($(KBUILD_EXTMOD),)
1100 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1102 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1103 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1104 $(libs-y) $(libs-m)))
1106 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1107 $(patsubst %/,%,$(filter %/, $(core-) \
1108 $(drivers-) $(libs-))))
1110 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1111 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1112 $(drivers-y) $(drivers-m)))
1114 build-dirs := $(vmlinux-dirs)
1115 clean-dirs := $(vmlinux-alldirs)
1117 # Externally visible symbols (used by link-vmlinux.sh)
1118 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1119 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1120 ifdef CONFIG_MODULES
1121 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1122 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1124 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1126 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1128 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1129 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1130 # used by scripts/Makefile.package
1131 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1133 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1135 # Recurse until adjust_autoksyms.sh is satisfied
1136 PHONY += autoksyms_recursive
1137 ifdef 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)
1143 autoksyms_recursive: descend modules.order
1144 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1145 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1148 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1150 quiet_cmd_autoksyms_h = GEN $@
1151 cmd_autoksyms_h = mkdir -p $(dir $@); \
1152 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1155 $(call cmd,autoksyms_h)
1157 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1159 # Final link of vmlinux with optional arch pass after final link
1160 cmd_link-vmlinux = \
1161 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1162 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1164 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1165 +$(call if_changed,link-vmlinux)
1169 # The actual objects are generated when descending,
1170 # make sure no implicit rule kicks in
1171 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1173 filechk_kernel.release = \
1174 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1176 # Store (new) KERNELRELEASE string in include/config/kernel.release
1177 include/config/kernel.release: FORCE
1178 $(call filechk,kernel.release)
1180 # Additional helpers built in scripts/
1181 # Carefully list dependencies so we do not try to build scripts twice
1184 scripts: scripts_basic scripts_dtc
1185 $(Q)$(MAKE) $(build)=$(@)
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.
1193 PHONY += prepare archprepare
1195 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1196 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1197 include/generated/autoconf.h
1199 prepare0: archprepare
1200 $(Q)$(MAKE) $(build)=scripts/mod
1201 $(Q)$(MAKE) $(build)=.
1203 # All the preparing..
1204 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1206 # Support for using generic headers in asm-generic
1207 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1209 PHONY += asm-generic uapi-asm-generic
1210 asm-generic: uapi-asm-generic
1211 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1212 generic=include/asm-generic
1214 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1215 generic=include/uapi/asm-generic
1217 PHONY += prepare-objtool prepare-resolve_btfids
1218 prepare-objtool: $(objtool_target)
1219 ifeq ($(SKIP_STACK_VALIDATION),1)
1220 ifdef 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
1224 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1228 prepare-resolve_btfids: $(resolve_btfids_target)
1229 ifeq ($(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
1233 # Generate some files
1234 # ---------------------------------------------------------------------------
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
1240 define filechk_utsrelease.h
1241 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1242 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1245 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1248 define filechk_version.h
1249 if [ $(SUBLEVEL) -gt 255 ]; then \
1250 echo \#define LINUX_VERSION_CODE $(shell \
1251 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255); \
1253 echo \#define LINUX_VERSION_CODE $(shell \
1254 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1256 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1257 ((c) > 255 ? 255 : (c)))'; \
1258 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1259 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1260 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1264 $(call filechk,version.h)
1266 include/generated/utsrelease.h: include/config/kernel.release FORCE
1267 $(call filechk,utsrelease.h)
1271 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1272 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1274 # ---------------------------------------------------------------------------
1277 #Default location for installed headers
1278 export INSTALL_HDR_PATH = $(objtree)/usr
1280 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1281 cmd_headers_install = \
1282 mkdir -p $(INSTALL_HDR_PATH); \
1283 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1284 usr/include $(INSTALL_HDR_PATH)
1286 PHONY += headers_install
1287 headers_install: headers
1288 $(call cmd,headers_install)
1290 PHONY += archheaders archscripts
1292 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1295 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1296 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1297 $(error Headers not exportable for the $(SRCARCH) architecture))
1298 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1299 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1301 # Deprecated. It is no-op now.
1302 PHONY += headers_check
1306 ifdef CONFIG_HEADERS_INSTALL
1310 PHONY += scripts_unifdef
1311 scripts_unifdef: scripts_basic
1312 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1314 # ---------------------------------------------------------------------------
1319 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1322 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1324 PHONY += kselftest-merge
1326 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1327 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1328 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1329 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1331 # ---------------------------------------------------------------------------
1334 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1335 dtstree := arch/$(SRCARCH)/boot/dts
1340 %.dtb: include/config/kernel.release scripts_dtc
1341 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1343 PHONY += dtbs dtbs_install dtbs_check
1344 dtbs: include/config/kernel.release scripts_dtc
1345 $(Q)$(MAKE) $(build)=$(dtstree)
1347 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1349 dtbs: dt_binding_check
1355 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1357 ifdef CONFIG_OF_EARLY_FLATTREE
1363 PHONY += scripts_dtc
1364 scripts_dtc: scripts_basic
1365 $(Q)$(MAKE) $(build)=scripts/dtc
1367 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1368 export CHECK_DT_BINDING=y
1371 PHONY += dt_binding_check
1372 dt_binding_check: scripts_dtc
1373 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1375 # ---------------------------------------------------------------------------
1378 ifdef CONFIG_MODULES
1380 # By default, build modules as well
1384 # When we're building modules with modversions, we need to consider
1385 # the built-in objects during the descend as well, in order to
1386 # make sure the checksums are up to date before we record them.
1387 ifdef CONFIG_MODVERSIONS
1393 # A module can be listed more than once in obj-m resulting in
1394 # duplicate lines in modules.order files. Those are removed
1395 # using awk while concatenating to the final file.
1398 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1399 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1401 PHONY += modules_check
1402 modules_check: modules.order
1403 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1405 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1407 modules.order: $(subdir-modorder) FORCE
1408 $(call if_changed,modules_order)
1410 targets += modules.order
1412 # Target to prepare building external modules
1413 PHONY += modules_prepare
1414 modules_prepare: prepare
1415 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1417 # Target to install modules
1418 PHONY += modules_install
1419 modules_install: _modinst_ _modinst_post
1423 @rm -rf $(MODLIB)/kernel
1424 @rm -f $(MODLIB)/source
1425 @mkdir -p $(MODLIB)/kernel
1426 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1427 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1428 rm -f $(MODLIB)/build ; \
1429 ln -s $(CURDIR) $(MODLIB)/build ; \
1431 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1432 @cp -f modules.builtin $(MODLIB)/
1433 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1434 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1436 # This depmod is only for convenience to give the initial
1437 # boot a modules.dep even before / is mounted read-write. However the
1438 # boot script depmod is the master version.
1439 PHONY += _modinst_post
1440 _modinst_post: _modinst_
1443 ifeq ($(CONFIG_MODULE_SIG), y)
1444 PHONY += modules_sign
1446 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1449 else # CONFIG_MODULES
1451 # Modules not configured
1452 # ---------------------------------------------------------------------------
1454 PHONY += modules modules_install
1455 modules modules_install:
1457 @echo >&2 "The present kernel configuration has modules disabled."
1458 @echo >&2 "Type 'make config' and enable loadable module support."
1459 @echo >&2 "Then build a kernel with module support enabled."
1463 endif # CONFIG_MODULES
1466 # Cleaning is done on three levels.
1467 # make clean Delete most generated files
1468 # Leave enough to build external modules
1469 # make mrproper Delete the current configuration, and all generated files
1470 # make distclean Remove editor backup files, patch leftover files and the like
1472 # Directories & files removed with 'make clean'
1473 CLEAN_FILES += include/ksym vmlinux.symvers \
1474 modules.builtin modules.builtin.modinfo modules.nsdeps \
1475 compile_commands.json
1477 # Directories & files removed with 'make mrproper'
1478 MRPROPER_FILES += include/config include/generated \
1479 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1480 debian snap tar-install \
1481 .config .config.old .version \
1483 signing_key.pem signing_key.priv signing_key.x509 \
1484 x509.genkey extra_certificates signing_key.x509.keyid \
1485 signing_key.x509.signer vmlinux-gdb.py \
1488 # Directories & files removed with 'make distclean'
1489 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1491 # clean - Delete most, but leave enough to build external modules
1493 clean: rm-files := $(CLEAN_FILES)
1495 PHONY += archclean vmlinuxclean
1498 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1499 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1501 clean: archclean vmlinuxclean
1503 # mrproper - Delete all generated files, including .config
1505 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1506 mrproper-dirs := $(addprefix _mrproper_,scripts)
1508 PHONY += $(mrproper-dirs) mrproper
1510 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1512 mrproper: clean $(mrproper-dirs)
1517 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1523 @find $(srctree) $(RCS_FIND_IGNORE) \
1524 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1525 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1526 -o -name 'core' \) \
1527 -type f -print | xargs rm -f
1530 # Packaging of the kernel to various formats
1531 # ---------------------------------------------------------------------------
1534 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1535 %pkg: include/config/kernel.release FORCE
1536 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1538 # Brief documentation of the typical targets used
1539 # ---------------------------------------------------------------------------
1541 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1542 boards := $(sort $(notdir $(boards)))
1543 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1544 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1548 @echo 'Cleaning targets:'
1549 @echo ' clean - Remove most generated files but keep the config and'
1550 @echo ' enough build support to build external modules'
1551 @echo ' mrproper - Remove all generated files + config + various backup files'
1552 @echo ' distclean - mrproper + remove editor backup and patch files'
1554 @echo 'Configuration targets:'
1555 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1557 @echo 'Other generic targets:'
1558 @echo ' all - Build all targets marked with [*]'
1559 @echo '* vmlinux - Build the bare kernel'
1560 @echo '* modules - Build all modules'
1561 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1562 @echo ' dir/ - Build all files in dir and below'
1563 @echo ' dir/file.[ois] - Build specified target only'
1564 @echo ' dir/file.ll - Build the LLVM assembly file'
1565 @echo ' (requires compiler support for LLVM assembly generation)'
1566 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1567 @echo ' (requires a recent binutils and recent build (System.map))'
1568 @echo ' dir/file.ko - Build module including final link'
1569 @echo ' modules_prepare - Set up for building external modules'
1570 @echo ' tags/TAGS - Generate tags file for editors'
1571 @echo ' cscope - Generate cscope index'
1572 @echo ' gtags - Generate GNU GLOBAL index'
1573 @echo ' kernelrelease - Output the release version string (use with make -s)'
1574 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1575 @echo ' image_name - Output the image name (use with make -s)'
1576 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1577 echo ' (default: $(INSTALL_HDR_PATH))'; \
1579 @echo 'Static analysers:'
1580 @echo ' checkstack - Generate a list of stack hogs'
1581 @echo ' versioncheck - Sanity check on version.h usage'
1582 @echo ' includecheck - Check for duplicate included header files'
1583 @echo ' export_report - List the usages of all exported symbols'
1584 @echo ' headerdep - Detect inclusion cycles in headers'
1585 @echo ' coccicheck - Check with Coccinelle'
1586 @echo ' clang-analyzer - Check with clang static analyzer'
1587 @echo ' clang-tidy - Check with clang-tidy'
1590 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1592 @echo 'Kernel selftest:'
1593 @echo ' kselftest - Build and run kernel selftest'
1594 @echo ' Build, install, and boot kernel before'
1595 @echo ' running kselftest on it'
1596 @echo ' Run as root for full coverage'
1597 @echo ' kselftest-all - Build kernel selftest'
1598 @echo ' kselftest-install - Build and install kernel selftest'
1599 @echo ' kselftest-clean - Remove all generated kselftest files'
1600 @echo ' kselftest-merge - Merge all the config dependencies of'
1601 @echo ' kselftest to existing .config.'
1604 echo 'Devicetree:'; \
1605 echo '* dtbs - Build device tree blobs for enabled boards'; \
1606 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1607 echo ' dt_binding_check - Validate device tree binding documents'; \
1608 echo ' dtbs_check - Validate device tree source files';\
1611 @echo 'Userspace tools targets:'
1612 @echo ' use "make tools/help"'
1613 @echo ' or "cd tools; make help"'
1615 @echo 'Kernel packaging:'
1616 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1618 @echo 'Documentation targets:'
1619 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1621 @echo 'Architecture specific targets ($(SRCARCH)):'
1622 @$(if $(archhelp),$(archhelp),\
1623 echo ' No architecture specific help defined for $(SRCARCH)')
1626 $(foreach b, $(boards), \
1627 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1629 @$(if $(board-dirs), \
1630 $(foreach b, $(board-dirs), \
1631 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1632 printf " %-16s - Show all of the above\\n" help-boards; \
1635 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1636 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1637 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1638 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1639 @echo ' (sparse by default)'
1640 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1641 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1642 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1643 @echo ' 1: warnings which may be relevant and do not occur too often'
1644 @echo ' 2: warnings which occur quite often but may still be relevant'
1645 @echo ' 3: more obscure warnings, can most likely be ignored'
1646 @echo ' Multiple levels can be combined with W=12 or W=123'
1648 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1649 @echo 'For further info see the ./README file'
1652 help-board-dirs := $(addprefix help-,$(board-dirs))
1654 help-boards: $(help-board-dirs)
1656 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1658 $(help-board-dirs): help-%:
1659 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1660 @$(if $(boards-per-dir), \
1661 $(foreach b, $(boards-per-dir), \
1662 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1666 # Documentation targets
1667 # ---------------------------------------------------------------------------
1668 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1669 linkcheckdocs dochelp refcheckdocs
1670 PHONY += $(DOC_TARGETS)
1672 $(Q)$(MAKE) $(build)=Documentation $@
1675 # ---------------------------------------------------------------------------
1677 PHONY += scripts_gdb
1678 scripts_gdb: prepare0
1679 $(Q)$(MAKE) $(build)=scripts/gdb
1680 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1682 ifdef CONFIG_GDB_SCRIPTS
1686 else # KBUILD_EXTMOD
1689 # External module support.
1690 # When building external modules the kernel used as basis is considered
1691 # read-only, and no consistency checks are made and the make
1692 # system is not used on the basis kernel. If updates are required
1693 # in the basis kernel ordinary make commands (without M=...) must
1696 # The following are the only valid targets when building external
1698 # make M=dir clean Delete all automatically generated files
1699 # make M=dir modules Make all modules in specified dir
1700 # make M=dir Same as 'make M=dir modules'
1701 # make M=dir modules_install
1702 # Install the modules built in the module directory
1703 # Assumes install directory is already created
1705 # We are always building only modules.
1709 build-dirs := $(KBUILD_EXTMOD)
1711 modules: $(MODORDER)
1712 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1714 $(MODORDER): descend
1717 PHONY += modules_install
1718 modules_install: _emodinst_ _emodinst_post
1720 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1723 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1724 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1726 PHONY += _emodinst_post
1727 _emodinst_post: _emodinst_
1730 compile_commands.json: $(extmod-prefix)compile_commands.json
1731 PHONY += compile_commands.json
1733 clean-dirs := $(KBUILD_EXTMOD)
1734 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1735 $(KBUILD_EXTMOD)/compile_commands.json
1739 @echo ' Building external modules.'
1740 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1742 @echo ' modules - default target, build the module(s)'
1743 @echo ' modules_install - install the module'
1744 @echo ' clean - remove generated files in module directory only'
1747 # no-op for external module builds
1748 PHONY += prepare modules_prepare
1750 endif # KBUILD_EXTMOD
1753 # ---------------------------------------------------------------------------
1754 # To build individual files in subdirectories, you can do like this:
1756 # make foo/bar/baz.s
1758 # The supported suffixes for single-target are listed in 'single-targets'
1760 # To build only under specific subdirectories, you can do like this:
1766 # .ko is special because modpost is needed
1767 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1768 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1770 $(single-ko): single_modpost
1772 $(single-no-ko): descend
1775 ifeq ($(KBUILD_EXTMOD),)
1776 # For the single build of in-tree modules, use a temporary file to avoid
1777 # the situation of modules_install installing an invalid modules.order.
1778 MODORDER := .modules.tmp
1781 PHONY += single_modpost
1782 single_modpost: $(single-no-ko) modules_prepare
1783 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1784 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1788 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1790 # trim unrelated directories
1791 build-dirs := $(foreach d, $(build-dirs), \
1792 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1796 ifndef CONFIG_MODULES
1800 # Handle descending into subdirectories listed in $(build-dirs)
1801 # Preset locale variables to speed up the build process. Limit locale
1802 # tweaks to this spot to avoid wrong language settings when running
1803 # make menuconfig etc.
1804 # Error messages still appears in the original language
1805 PHONY += descend $(build-dirs)
1806 descend: $(build-dirs)
1807 $(build-dirs): prepare
1808 $(Q)$(MAKE) $(build)=$@ \
1809 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1810 need-builtin=1 need-modorder=1
1812 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1813 PHONY += $(clean-dirs) clean
1815 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1817 clean: $(clean-dirs)
1819 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1820 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1822 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1823 -o -name '*.dwo' -o -name '*.lst' \
1824 -o -name '*.su' -o -name '*.mod' \
1825 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1826 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1827 -o -name '*.asn1.[ch]' \
1828 -o -name '*.symtypes' -o -name 'modules.order' \
1829 -o -name '.tmp_*.o.*' \
1830 -o -name '*.c.[012]*.*' \
1832 -o -name '*.gcno' \) -type f -print | xargs rm -f
1834 # Generate tags for editors
1835 # ---------------------------------------------------------------------------
1836 quiet_cmd_tags = GEN $@
1837 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1839 tags TAGS cscope gtags: FORCE
1842 # Script to generate missing namespace dependencies
1843 # ---------------------------------------------------------------------------
1846 nsdeps: export KBUILD_NSDEPS=1
1848 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1851 # ---------------------------------------------------------------------------
1853 quiet_cmd_gen_compile_commands = GEN $@
1854 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1856 $(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1857 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1858 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1859 $(call if_changed,gen_compile_commands)
1861 targets += $(extmod-prefix)compile_commands.json
1863 PHONY += clang-tidy clang-analyzer
1865 ifdef CONFIG_CC_IS_CLANG
1866 quiet_cmd_clang_tools = CHECK $<
1867 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1869 clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1870 $(call cmd,clang_tools)
1872 clang-tidy clang-analyzer:
1873 @echo "$@ requires CC=clang" >&2
1877 # Scripts to check various things for consistency
1878 # ---------------------------------------------------------------------------
1880 PHONY += includecheck versioncheck coccicheck export_report
1883 find $(srctree)/* $(RCS_FIND_IGNORE) \
1884 -name '*.[hcS]' -type f -print | sort \
1885 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1888 find $(srctree)/* $(RCS_FIND_IGNORE) \
1889 -name '*.[hcS]' -type f -print | sort \
1890 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1893 $(Q)$(BASH) $(srctree)/scripts/$@
1896 $(PERL) $(srctree)/scripts/export_report.pl
1898 PHONY += checkstack kernelrelease kernelversion image_name
1900 # UML needs a little special treatment here. It wants to use the host
1901 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1902 # else wants $(ARCH), including people doing cross-builds, which means
1903 # that $(SUBARCH) doesn't work here.
1905 CHECKSTACK_ARCH := $(SUBARCH)
1907 CHECKSTACK_ARCH := $(ARCH)
1910 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1911 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1914 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1917 @echo $(KERNELVERSION)
1920 @echo $(KBUILD_IMAGE)
1922 # Clear a bunch of variables before executing the submake
1924 ifeq ($(quiet),silent_)
1929 $(Q)mkdir -p $(objtree)/tools
1930 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1933 $(Q)mkdir -p $(objtree)/tools
1934 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1936 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1937 cmd_rmfiles = rm -rf $(rm-files)
1939 # Run depmod only if we have System.map and depmod is executable
1940 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1941 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1944 # read saved command lines for existing targets
1945 existing-targets := $(wildcard $(sort $(targets)))
1947 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1949 endif # config-build
1951 endif # need-sub-make
1956 # Declare the contents of the PHONY variable as phony. We keep that
1957 # information in a variable so we can use it in if_changed and friends.