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 # That's our default target when none is given on the command line
18 # We are using a recursive build, so we need to do a little thinking
19 # to get the ordering right.
21 # Most importantly: sub-Makefiles should only ever modify files in
22 # their own directory. If in some directory we have a dependency on
23 # a file in another dir (which doesn't happen often, but it's often
24 # unavoidable when linking the built-in.a targets which finally
25 # turn into vmlinux), we will call a sub make in that other dir, and
26 # after that we are sure that everything which is in that other dir
29 # The only cases where we need to modify files which have global
30 # effects are thus separated out and done before the recursive
31 # descending is started. They are now explicitly listed as the
34 ifneq ($(sub_make_done),1)
36 # Do not use make's built-in rules and variables
37 # (this increases performance and avoids hard-to-debug behaviour)
40 # Avoid funny character set dependencies
44 export LC_COLLATE LC_NUMERIC
46 # Avoid interference with shell env settings
50 # ---------------------------------------------------------------------------
52 # Normally, we echo the whole command before executing it. By making
53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
54 # $(quiet) to choose other forms of output instead, e.g.
56 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
57 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
59 # If $(quiet) is empty, the whole command will be printed.
60 # If it is set to "quiet_", only the short version will be printed.
61 # If it is set to "silent_", nothing will be printed at all, since
62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
64 # A simple variant is to prefix commands with $(Q) - that's useful
65 # for commands that shall be hidden in non-verbose mode.
69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
71 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
73 # To put more focus on warnings, be less verbose as default
74 # Use 'make V=1' to see the full commands
76 ifeq ("$(origin V)", "command line")
83 ifeq ($(KBUILD_VERBOSE),1)
91 # If the user is running make -s (silent mode), suppress echoing of
94 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
98 export quiet Q KBUILD_VERBOSE
100 # Kbuild will save output files in the current working directory.
101 # This does not need to match to the root of the kernel source tree.
103 # For example, you can do this:
105 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
107 # If you want to save output files in a different location, there are
108 # two syntaxes to specify it.
111 # Use "make O=dir/to/store/output/files/"
113 # 2) Set KBUILD_OUTPUT
114 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
115 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
117 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
120 # Do we want to change the working directory?
121 ifeq ("$(origin O)", "command line")
122 KBUILD_OUTPUT := $(O)
125 ifneq ($(KBUILD_OUTPUT),)
126 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
127 # expand a shell special character '~'. We use a somewhat tedious way here.
128 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
129 $(if $(abs_objtree),, \
130 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
132 # $(realpath ...) resolves symlinks
133 abs_objtree := $(realpath $(abs_objtree))
135 abs_objtree := $(CURDIR)
136 endif # ifneq ($(KBUILD_OUTPUT),)
138 ifeq ($(abs_objtree),$(CURDIR))
139 # Suppress "Entering directory ..." unless we are changing the work directory.
140 MAKEFLAGS += --no-print-directory
145 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
147 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
148 $(error source directory cannot contain spaces or colons)
151 ifneq ($(abs_srctree),$(abs_objtree))
152 # Look for make include files relative to root of kernel src
154 # This does not become effective immediately because MAKEFLAGS is re-parsed
155 # once after the Makefile is read. We need to invoke sub-make.
156 MAKEFLAGS += --include-dir=$(abs_srctree)
160 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
161 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
162 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
164 # Cancel implicit rules for this Makefile.
165 $(lastword $(MAKEFILE_LIST)): ;
168 export abs_srctree abs_objtree
169 export sub_make_done := 1
171 ifeq ($(need-sub-make),1)
173 PHONY += $(MAKECMDGOALS) sub-make
175 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
178 # Invoke a second make in the output directory, passing relevant variables
180 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
182 endif # need-sub-make
183 endif # sub_make_done
185 # We process the rest of the Makefile if this is the final invocation of make
186 ifeq ($(need-sub-make),)
188 # Do not print "Entering directory ...",
189 # but we want to display it when entering to the output directory
190 # so that IDEs/editors are able to understand relative filenames.
191 MAKEFLAGS += --no-print-directory
193 # Call a source code checker (by default, "sparse") as part of the
196 # Use 'make C=1' to enable checking of only re-compiled files.
197 # Use 'make C=2' to enable checking of *all* source files, regardless
198 # of whether they are re-compiled or not.
200 # See the file "Documentation/dev-tools/sparse.rst" for more details,
201 # including where to get the "sparse" utility.
203 ifeq ("$(origin C)", "command line")
204 KBUILD_CHECKSRC = $(C)
206 ifndef KBUILD_CHECKSRC
210 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
211 # directory of external module to build. Setting M= takes precedence.
212 ifeq ("$(origin M)", "command line")
213 KBUILD_EXTMOD := $(M)
216 export KBUILD_CHECKSRC KBUILD_EXTMOD
218 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
220 ifeq ($(abs_srctree),$(abs_objtree))
221 # building in the source tree
223 building_out_of_srctree :=
225 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
226 # building in a subdirectory of the source tree
229 srctree := $(abs_srctree)
231 building_out_of_srctree := 1
234 ifneq ($(KBUILD_ABS_SRCTREE),)
235 srctree := $(abs_srctree)
241 export building_out_of_srctree srctree objtree VPATH
243 # To make sure we do not include .config for any of the *config targets
244 # catch them early, and hand them over to scripts/kconfig/Makefile
245 # It is allowed to specify more targets when calling make, including
246 # mixing *config targets and build targets.
247 # For example 'make oldconfig all'.
248 # Detect when mixed targets is specified, and make a second invocation
249 # of make so .config is not included in this case either (for *config).
251 version_h := include/generated/uapi/linux/version.h
252 old_version_h := include/linux/version.h
254 clean-targets := %clean mrproper cleandocs
255 no-dot-config-targets := $(clean-targets) \
256 cscope gtags TAGS tags help% %docs check% coccicheck \
257 $(version_h) headers headers_% archheaders archscripts \
258 %asm-generic kernelversion %src-pkg dt_binding_check \
260 no-sync-config-targets := $(no-dot-config-targets) install %install \
262 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
270 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
271 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
276 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
277 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
282 ifneq ($(KBUILD_EXTMOD),)
286 ifeq ($(KBUILD_EXTMOD),)
287 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
289 ifneq ($(words $(MAKECMDGOALS)),1)
295 # We cannot build single targets and the others at the same time
296 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
298 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
303 # For "make -j clean all", "make -j mrproper defconfig all", etc.
304 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
305 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
310 # install and modules_install need also be processed one by one
311 ifneq ($(filter install,$(MAKECMDGOALS)),)
312 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
318 # ===========================================================================
319 # We're called with mixed targets (*config and build targets).
320 # Handle them one by one.
322 PHONY += $(MAKECMDGOALS) __build_one_by_one
324 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
329 for i in $(MAKECMDGOALS); do \
330 $(MAKE) -f $(srctree)/Makefile $$i; \
335 include scripts/Kbuild.include
337 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
338 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
339 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
340 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
342 include scripts/subarch.include
344 # Cross compiling and selecting different set of gcc/bin-utils
345 # ---------------------------------------------------------------------------
347 # When performing cross compilation for other architectures ARCH shall be set
348 # to the target architecture. (See arch/* for the possibilities).
349 # ARCH can be set during invocation of make:
351 # Another way is to have ARCH set in the environment.
352 # The default ARCH is the host where make is executed.
354 # CROSS_COMPILE specify the prefix used for all executables used
355 # during compilation. Only gcc and related bin-utils executables
356 # are prefixed with $(CROSS_COMPILE).
357 # CROSS_COMPILE can be set on the command line
358 # make CROSS_COMPILE=ia64-linux-
359 # Alternatively CROSS_COMPILE can be set in the environment.
360 # Default value for CROSS_COMPILE is not to prefix executables
361 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
364 # Architecture as present in compile.h
365 UTS_MACHINE := $(ARCH)
368 # Additional ARCH settings for x86
372 ifeq ($(ARCH),x86_64)
376 # Additional ARCH settings for sparc
377 ifeq ($(ARCH),sparc32)
380 ifeq ($(ARCH),sparc64)
384 # Additional ARCH settings for sh
389 KCONFIG_CONFIG ?= .config
390 export KCONFIG_CONFIG
392 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
393 export KBUILD_DEFCONFIG := defconfig
395 # SHELL used by kbuild
398 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
399 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
400 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
409 KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
410 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
412 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
413 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
414 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
416 # Make variables (CC, etc...)
423 OBJCOPY = llvm-objcopy
424 OBJDUMP = llvm-objdump
425 READELF = llvm-readelf
429 CC = $(CROSS_COMPILE)gcc
430 LD = $(CROSS_COMPILE)ld
431 AR = $(CROSS_COMPILE)ar
432 NM = $(CROSS_COMPILE)nm
433 OBJCOPY = $(CROSS_COMPILE)objcopy
434 OBJDUMP = $(CROSS_COMPILE)objdump
435 READELF = $(CROSS_COMPILE)readelf
436 OBJSIZE = $(CROSS_COMPILE)size
437 STRIP = $(CROSS_COMPILE)strip
443 INSTALLKERNEL := installkernel
444 DEPMOD = /sbin/depmod
451 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
452 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
461 # Use USERINCLUDE when you must reference the UAPI directories only.
463 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
464 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
465 -I$(srctree)/include/uapi \
466 -I$(objtree)/include/generated/uapi \
467 -include $(srctree)/include/linux/kconfig.h
469 # Use LINUXINCLUDE when you must reference the include/ directory.
470 # Needed to be compatible with the O= option
472 -I$(srctree)/arch/$(SRCARCH)/include \
473 -I$(objtree)/arch/$(SRCARCH)/include/generated \
474 $(if $(building_out_of_srctree),-I$(srctree)/include) \
475 -I$(objtree)/include \
478 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
479 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
480 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
481 -Werror=implicit-function-declaration -Werror=implicit-int \
482 -Wno-format-security \
484 KBUILD_CPPFLAGS := -D__KERNEL__
485 KBUILD_AFLAGS_KERNEL :=
486 KBUILD_CFLAGS_KERNEL :=
487 KBUILD_AFLAGS_MODULE := -DMODULE
488 KBUILD_CFLAGS_MODULE := -DMODULE
489 KBUILD_LDFLAGS_MODULE :=
490 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
492 GCC_PLUGINS_CFLAGS :=
495 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
496 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
497 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
498 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
500 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
501 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
502 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
503 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
504 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
505 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
507 # Files to ignore in find ... statements
509 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
510 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
512 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
513 --exclude CVS --exclude .pc --exclude .hg --exclude .git
515 # ===========================================================================
516 # Rules shared between *config targets and build targets
518 # Basic helpers built in scripts/basic/
519 PHONY += scripts_basic
521 $(Q)$(MAKE) $(build)=scripts/basic
522 $(Q)rm -f .tmp_quiet_recordmcount
524 PHONY += outputmakefile
525 # Before starting out-of-tree build, make sure the source tree is clean.
526 # outputmakefile generates a Makefile in the output directory, if using a
527 # separate output directory. This allows convenient use of make in the
529 # At the same time when output Makefile generated, generate .gitignore to
530 # ignore whole output directory
532 ifdef building_out_of_srctree
533 $(Q)if [ -f $(srctree)/.config -o \
534 -d $(srctree)/include/config -o \
535 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
537 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
538 echo >&2 "*** in $(abs_srctree)";\
542 $(Q)ln -fsn $(srctree) source
543 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
544 $(Q)test -e .gitignore || \
545 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
548 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
549 ifneq ($(CROSS_COMPILE),)
550 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
551 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
552 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
553 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
555 ifneq ($(GCC_TOOLCHAIN),)
556 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
558 ifneq ($(LLVM_IAS),1)
559 CLANG_FLAGS += -no-integrated-as
561 CLANG_FLAGS += -Werror=unknown-warning-option
562 KBUILD_CFLAGS += $(CLANG_FLAGS)
563 KBUILD_AFLAGS += $(CLANG_FLAGS)
567 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
568 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
569 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
570 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
571 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
574 # ===========================================================================
575 # *config targets only - make sure prerequisites are updated, and descend
576 # in scripts/kconfig to make the *config target
578 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
579 # KBUILD_DEFCONFIG may point out an alternative default configuration
580 # used for 'make defconfig'
581 include arch/$(SRCARCH)/Makefile
582 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
584 config: outputmakefile scripts_basic FORCE
585 $(Q)$(MAKE) $(build)=scripts/kconfig $@
587 %config: outputmakefile scripts_basic FORCE
588 $(Q)$(MAKE) $(build)=scripts/kconfig $@
591 # ===========================================================================
592 # Build targets only - this includes vmlinux, arch specific targets, clean
593 # targets and others. In general all targets except *config targets.
595 # If building an external module we do not care about the all: rule
596 # but instead _all depend on modules
598 ifeq ($(KBUILD_EXTMOD),)
604 # Decide whether to build built-in, modular, or both.
605 # Normally, just do built-in.
610 # If we have only "make modules", don't compile built-in objects.
611 # When we're building modules with modversions, we need to consider
612 # the built-in objects during the descend as well, in order to
613 # make sure the checksums are up to date before we record them.
615 ifeq ($(MAKECMDGOALS),modules)
616 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
619 # If we have "make <whatever> modules", compile modules
620 # in addition to whatever we do anyway.
621 # Just "make" or "make all" shall build modules as well
623 ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
627 ifeq ($(MAKECMDGOALS),)
631 export KBUILD_MODULES KBUILD_BUILTIN
634 include include/config/auto.conf
637 ifeq ($(KBUILD_EXTMOD),)
638 # Objects we will link into vmlinux / subdirs we need to visit
640 drivers-y := drivers/ sound/
641 drivers-$(CONFIG_SAMPLES) += samples/
646 endif # KBUILD_EXTMOD
648 # The all: target is the default when no target is given on the
650 # This allow a user to issue only 'make' to build a kernel including modules
651 # Defaults to vmlinux, but the arch makefile usually adds further targets
654 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
655 $(call cc-option,-fno-tree-loop-im) \
656 $(call cc-disable-warning,maybe-uninitialized,)
659 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
660 ifdef CONFIG_FUNCTION_TRACER
661 CC_FLAGS_FTRACE := -pg
664 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
665 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
666 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
667 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
668 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
669 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
670 export RETPOLINE_CFLAGS
671 export RETPOLINE_VDSO_CFLAGS
673 include arch/$(SRCARCH)/Makefile
676 ifdef may-sync-config
677 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
678 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
679 # because some architectures define CROSS_COMPILE there.
680 include include/config/auto.conf.cmd
684 @echo >&2 '*** Configuration file "$@" not found!'
686 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
687 @echo >&2 '*** "make menuconfig" or "make xconfig").'
691 # The actual configuration files used during the build are stored in
692 # include/generated/ and include/config/. Update them if .config is newer than
693 # include/config/auto.conf (which mirrors .config).
695 # This exploits the 'multi-target pattern rule' trick.
696 # The syncconfig should be executed only once to make all the targets.
697 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
698 %/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG)
699 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
700 else # !may-sync-config
701 # External modules and some install targets need include/generated/autoconf.h
702 # and include/config/auto.conf but do not care if they are up-to-date.
703 # Use auto.conf to trigger the test
704 PHONY += include/config/auto.conf
706 include/config/auto.conf:
707 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
709 echo >&2 " ERROR: Kernel configuration is invalid."; \
710 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
711 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
715 endif # may-sync-config
718 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
719 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
720 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
721 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
722 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
724 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
726 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
728 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
732 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
733 KBUILD_CFLAGS += -Wno-maybe-uninitialized
736 # Tell gcc to never replace conditional load with a non-conditional one
737 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
738 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
740 include scripts/Makefile.kcov
741 include scripts/Makefile.gcc-plugins
743 ifdef CONFIG_READABLE_ASM
744 # Disable optimizations that make assembler listings hard to read.
745 # reorder blocks reorders the control in the function
746 # ipa clone creates specialized cloned functions
747 # partial inlining inlines only parts of functions
748 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
749 $(call cc-option,-fno-ipa-cp-clone,) \
750 $(call cc-option,-fno-partial-inlining)
753 ifneq ($(CONFIG_FRAME_WARN),0)
754 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
757 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
758 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
759 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
761 KBUILD_CFLAGS += $(stackp-flags-y)
763 ifdef CONFIG_CC_IS_CLANG
764 KBUILD_CPPFLAGS += -Qunused-arguments
765 KBUILD_CFLAGS += -Wno-format-invalid-specifier
766 KBUILD_CFLAGS += -Wno-gnu
767 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
768 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
769 # See modpost pattern 2
770 KBUILD_CFLAGS += -mno-global-merge
773 # These warnings generated too much noise in a regular build.
774 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
775 KBUILD_CFLAGS += -Wno-unused-but-set-variable
777 # Warn about unmarked fall-throughs in switch statement.
778 # Disabled for clang while comment to attribute conversion happens and
779 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
780 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
783 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
784 ifdef CONFIG_FRAME_POINTER
785 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
787 # Some targets (ARM with Thumb2, for example), can't be built with frame
788 # pointers. For those, we don't have FUNCTION_TRACER automatically
789 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
790 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
791 # -fomit-frame-pointer with FUNCTION_TRACER.
792 ifndef CONFIG_FUNCTION_TRACER
793 KBUILD_CFLAGS += -fomit-frame-pointer
797 # Initialize all stack variables with a pattern, if desired.
798 ifdef CONFIG_INIT_STACK_ALL
799 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
802 DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
804 ifdef CONFIG_DEBUG_INFO
805 ifdef CONFIG_DEBUG_INFO_SPLIT
806 DEBUG_CFLAGS += -gsplit-dwarf
810 KBUILD_AFLAGS += -Wa,-gdwarf-2
812 ifdef CONFIG_DEBUG_INFO_DWARF4
813 DEBUG_CFLAGS += -gdwarf-4
816 ifdef CONFIG_DEBUG_INFO_REDUCED
817 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
818 $(call cc-option,-fno-var-tracking)
821 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
824 ifdef CONFIG_FUNCTION_TRACER
825 ifdef CONFIG_FTRACE_MCOUNT_RECORD
826 # gcc 5 supports generating the mcount tables directly
827 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
828 CC_FLAGS_FTRACE += -mrecord-mcount
829 export CC_USING_RECORD_MCOUNT := 1
831 ifdef CONFIG_HAVE_NOP_MCOUNT
832 ifeq ($(call cc-option-yn, -mnop-mcount),y)
833 CC_FLAGS_FTRACE += -mnop-mcount
834 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
838 ifdef CONFIG_HAVE_FENTRY
839 ifeq ($(call cc-option-yn, -mfentry),y)
840 CC_FLAGS_FTRACE += -mfentry
841 CC_FLAGS_USING += -DCC_USING_FENTRY
844 export CC_FLAGS_FTRACE
845 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
846 KBUILD_AFLAGS += $(CC_FLAGS_USING)
847 ifdef CONFIG_DYNAMIC_FTRACE
848 ifdef CONFIG_HAVE_C_RECORDMCOUNT
849 BUILD_C_RECORDMCOUNT := y
850 export BUILD_C_RECORDMCOUNT
855 # We trigger additional mismatches with less inlining
856 ifdef CONFIG_DEBUG_SECTION_MISMATCH
857 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
860 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
861 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
862 LDFLAGS_vmlinux += --gc-sections
865 ifdef CONFIG_LIVEPATCH
866 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
869 # arch Makefile may override CC so keep this after arch Makefile is included
870 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
872 # warn about C99 declaration after statement
873 KBUILD_CFLAGS += -Wdeclaration-after-statement
875 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
876 KBUILD_CFLAGS += -Wvla
878 # disable pointer signed / unsigned warnings in gcc 4.0
879 KBUILD_CFLAGS += -Wno-pointer-sign
881 # disable stringop warnings in gcc 8+
882 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
884 # disable invalid "can't wrap" optimizations for signed / pointers
885 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
887 # clang sets -fmerge-all-constants by default as optimization, but this
888 # is non-conforming behavior for C and in fact breaks the kernel, so we
889 # need to disable it here generally.
890 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
892 # for gcc -fno-merge-all-constants disables everything, but it is fine
893 # to have actual conforming behavior enabled.
894 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
896 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
897 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
899 # conserve stack if available
900 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
902 # Prohibit date/time macros, which would make the build non-deterministic
903 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
905 # enforce correct pointer usage
906 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
908 # Require designated initializers for all marked structures
909 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
911 # change __FILE__ to the relative path from the srctree
912 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
914 # ensure -fcf-protection is disabled when using retpoline as it is
915 # incompatible with -mindirect-branch=thunk-extern
916 ifdef CONFIG_RETPOLINE
917 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
920 include scripts/Makefile.kasan
921 include scripts/Makefile.extrawarn
922 include scripts/Makefile.ubsan
924 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
925 KBUILD_CPPFLAGS += $(KCPPFLAGS)
926 KBUILD_AFLAGS += $(KAFLAGS)
927 KBUILD_CFLAGS += $(KCFLAGS)
929 KBUILD_LDFLAGS_MODULE += --build-id
930 LDFLAGS_vmlinux += --build-id
932 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
933 LDFLAGS_vmlinux += $(call ld-option, -X,)
936 ifeq ($(CONFIG_RELR),y)
937 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
940 # make the checker run with the right architecture
941 CHECKFLAGS += --arch=$(ARCH)
943 # insure the checker run with the right endianness
944 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
946 # the checker needs the correct machine size
947 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
949 # Default kernel image to build when no specific target is given.
950 # KBUILD_IMAGE may be overruled on the command line or
951 # set in the environment
952 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
954 export KBUILD_IMAGE ?= vmlinux
957 # INSTALL_PATH specifies where to place the updated kernel and system map
958 # images. Default is /boot, but you can set it to other values
959 export INSTALL_PATH ?= /boot
962 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
963 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
964 # an argument if needed. Otherwise it defaults to the kernel install path
966 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
969 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
970 # relocations required by build roots. This is not defined in the
971 # makefile but the argument can be passed to make if needed.
974 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
978 # INSTALL_MOD_STRIP, if defined, will cause modules to be
979 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
980 # the default option --strip-debug will be used. Otherwise,
981 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
983 ifdef INSTALL_MOD_STRIP
984 ifeq ($(INSTALL_MOD_STRIP),1)
985 mod_strip_cmd = $(STRIP) --strip-debug
987 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
988 endif # INSTALL_MOD_STRIP=1
991 endif # INSTALL_MOD_STRIP
994 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
995 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
996 # or CONFIG_MODULE_COMPRESS_XZ.
998 mod_compress_cmd = true
999 ifdef CONFIG_MODULE_COMPRESS
1000 ifdef CONFIG_MODULE_COMPRESS_GZIP
1001 mod_compress_cmd = gzip -n -f
1002 endif # CONFIG_MODULE_COMPRESS_GZIP
1003 ifdef CONFIG_MODULE_COMPRESS_XZ
1004 mod_compress_cmd = xz -f
1005 endif # CONFIG_MODULE_COMPRESS_XZ
1006 endif # CONFIG_MODULE_COMPRESS
1007 export mod_compress_cmd
1009 ifdef CONFIG_MODULE_SIG_ALL
1010 $(eval $(call config_filename,MODULE_SIG_KEY))
1012 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1018 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1020 ifdef CONFIG_STACK_VALIDATION
1021 has_libelf := $(call try-run,\
1022 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1023 ifeq ($(has_libelf),1)
1024 objtool_target := tools/objtool FORCE
1026 SKIP_STACK_VALIDATION := 1
1027 export SKIP_STACK_VALIDATION
1033 export MODORDER := $(extmod-prefix)modules.order
1034 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1036 ifeq ($(KBUILD_EXTMOD),)
1037 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1039 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1040 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1041 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1043 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1044 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1045 $(drivers-) $(net-) $(libs-) $(virt-))))
1047 build-dirs := $(vmlinux-dirs)
1048 clean-dirs := $(vmlinux-alldirs)
1050 init-y := $(patsubst %/, %/built-in.a, $(init-y))
1051 core-y := $(patsubst %/, %/built-in.a, $(core-y))
1052 drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1053 net-y := $(patsubst %/, %/built-in.a, $(net-y))
1054 libs-y2 := $(patsubst %/, %/built-in.a, $(filter %/, $(libs-y)))
1055 ifdef CONFIG_MODULES
1056 libs-y1 := $(filter-out %/, $(libs-y))
1057 libs-y2 += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1059 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1061 virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1063 # Externally visible symbols (used by link-vmlinux.sh)
1064 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1065 $(drivers-y) $(net-y) $(virt-y)
1066 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1067 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1068 export LDFLAGS_vmlinux
1069 # used by scripts/Makefile.package
1070 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1072 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1074 # Recurse until adjust_autoksyms.sh is satisfied
1075 PHONY += autoksyms_recursive
1076 ifdef CONFIG_TRIM_UNUSED_KSYMS
1077 autoksyms_recursive: descend modules.order
1078 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1079 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1082 # For the kernel to actually contain only the needed exported symbols,
1083 # we have to build modules as well to determine what those symbols are.
1084 # (this can be evaluated only once include/config/auto.conf has been included)
1085 ifdef CONFIG_TRIM_UNUSED_KSYMS
1089 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1091 quiet_cmd_autoksyms_h = GEN $@
1092 cmd_autoksyms_h = mkdir -p $(dir $@); \
1093 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1096 $(call cmd,autoksyms_h)
1098 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1100 # Final link of vmlinux with optional arch pass after final link
1101 cmd_link-vmlinux = \
1102 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
1103 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1105 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1106 +$(call if_changed,link-vmlinux)
1110 # The actual objects are generated when descending,
1111 # make sure no implicit rule kicks in
1112 $(sort $(vmlinux-deps)): descend ;
1114 filechk_kernel.release = \
1115 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1117 # Store (new) KERNELRELEASE string in include/config/kernel.release
1118 include/config/kernel.release: FORCE
1119 $(call filechk,kernel.release)
1121 # Additional helpers built in scripts/
1122 # Carefully list dependencies so we do not try to build scripts twice
1125 scripts: scripts_basic scripts_dtc
1126 $(Q)$(MAKE) $(build)=$(@)
1128 # Things we need to do before we recursively start building the kernel
1129 # or the modules are listed in "prepare".
1130 # A multi level approach is used. prepareN is processed before prepareN-1.
1131 # archprepare is used in arch Makefiles and when processed asm symlink,
1132 # version.h and scripts_basic is processed / created.
1134 PHONY += prepare archprepare
1136 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1137 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1139 prepare0: archprepare
1140 $(Q)$(MAKE) $(build)=scripts/mod
1141 $(Q)$(MAKE) $(build)=.
1143 # All the preparing..
1144 prepare: prepare0 prepare-objtool
1146 # Support for using generic headers in asm-generic
1147 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1149 PHONY += asm-generic uapi-asm-generic
1150 asm-generic: uapi-asm-generic
1151 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1152 generic=include/asm-generic
1154 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1155 generic=include/uapi/asm-generic
1157 PHONY += prepare-objtool
1158 prepare-objtool: $(objtool_target)
1159 ifeq ($(SKIP_STACK_VALIDATION),1)
1160 ifdef CONFIG_UNWINDER_ORC
1161 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1164 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1168 # Generate some files
1169 # ---------------------------------------------------------------------------
1171 # KERNELRELEASE can change from a few different places, meaning version.h
1172 # needs to be updated, so this check is forced on all builds
1175 define filechk_utsrelease.h
1176 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1177 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1180 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1183 define filechk_version.h
1184 echo \#define LINUX_VERSION_CODE $(shell \
1185 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1186 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1190 $(call filechk,version.h)
1191 $(Q)rm -f $(old_version_h)
1193 include/generated/utsrelease.h: include/config/kernel.release FORCE
1194 $(call filechk,utsrelease.h)
1198 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1199 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1201 # ---------------------------------------------------------------------------
1204 #Default location for installed headers
1205 export INSTALL_HDR_PATH = $(objtree)/usr
1207 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1208 cmd_headers_install = \
1209 mkdir -p $(INSTALL_HDR_PATH); \
1210 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1211 usr/include $(INSTALL_HDR_PATH)
1213 PHONY += headers_install
1214 headers_install: headers
1215 $(call cmd,headers_install)
1217 PHONY += archheaders archscripts
1219 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1222 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1223 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1224 $(error Headers not exportable for the $(SRCARCH) architecture))
1225 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1226 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1228 # Deprecated. It is no-op now.
1229 PHONY += headers_check
1233 ifdef CONFIG_HEADERS_INSTALL
1237 PHONY += scripts_unifdef
1238 scripts_unifdef: scripts_basic
1239 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1241 # ---------------------------------------------------------------------------
1246 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1249 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1251 PHONY += kselftest-merge
1253 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1254 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1255 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1256 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1258 # ---------------------------------------------------------------------------
1261 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1262 dtstree := arch/$(SRCARCH)/boot/dts
1267 %.dtb: include/config/kernel.release scripts_dtc
1268 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1270 PHONY += dtbs dtbs_install dtbs_check
1271 dtbs: include/config/kernel.release scripts_dtc
1272 $(Q)$(MAKE) $(build)=$(dtstree)
1274 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1276 dtbs: dt_binding_check
1282 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1284 ifdef CONFIG_OF_EARLY_FLATTREE
1290 PHONY += scripts_dtc
1291 scripts_dtc: scripts_basic
1292 $(Q)$(MAKE) $(build)=scripts/dtc
1294 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1295 export CHECK_DT_BINDING=y
1298 PHONY += dt_binding_check
1299 dt_binding_check: scripts_dtc
1300 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1302 # ---------------------------------------------------------------------------
1305 ifdef CONFIG_MODULES
1307 # By default, build modules as well
1313 # A module can be listed more than once in obj-m resulting in
1314 # duplicate lines in modules.order files. Those are removed
1315 # using awk while concatenating to the final file.
1318 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order
1319 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1320 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1322 modules.order: descend
1323 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1325 # Target to prepare building external modules
1326 PHONY += modules_prepare
1327 modules_prepare: prepare
1329 # Target to install modules
1330 PHONY += modules_install
1331 modules_install: _modinst_ _modinst_post
1335 @rm -rf $(MODLIB)/kernel
1336 @rm -f $(MODLIB)/source
1337 @mkdir -p $(MODLIB)/kernel
1338 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1339 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1340 rm -f $(MODLIB)/build ; \
1341 ln -s $(CURDIR) $(MODLIB)/build ; \
1343 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1344 @cp -f modules.builtin $(MODLIB)/
1345 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1346 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1348 # This depmod is only for convenience to give the initial
1349 # boot a modules.dep even before / is mounted read-write. However the
1350 # boot script depmod is the master version.
1351 PHONY += _modinst_post
1352 _modinst_post: _modinst_
1355 ifeq ($(CONFIG_MODULE_SIG), y)
1356 PHONY += modules_sign
1358 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1361 else # CONFIG_MODULES
1363 # Modules not configured
1364 # ---------------------------------------------------------------------------
1366 PHONY += modules modules_install
1367 modules modules_install:
1369 @echo >&2 "The present kernel configuration has modules disabled."
1370 @echo >&2 "Type 'make config' and enable loadable module support."
1371 @echo >&2 "Then build a kernel with module support enabled."
1375 endif # CONFIG_MODULES
1378 # Cleaning is done on three levels.
1379 # make clean Delete most generated files
1380 # Leave enough to build external modules
1381 # make mrproper Delete the current configuration, and all generated files
1382 # make distclean Remove editor backup files, patch leftover files and the like
1384 # Directories & files removed with 'make clean'
1385 CLEAN_DIRS += include/ksym
1386 CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps
1388 # Directories & files removed with 'make mrproper'
1389 MRPROPER_DIRS += include/config include/generated \
1390 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1391 debian/ snap/ tar-install/
1392 MRPROPER_FILES += .config .config.old .version \
1394 signing_key.pem signing_key.priv signing_key.x509 \
1395 x509.genkey extra_certificates signing_key.x509.keyid \
1396 signing_key.x509.signer vmlinux-gdb.py \
1399 # Directories & files removed with 'make distclean'
1401 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1403 # clean - Delete most, but leave enough to build external modules
1405 clean: rm-dirs := $(CLEAN_DIRS)
1406 clean: rm-files := $(CLEAN_FILES)
1408 PHONY += archclean vmlinuxclean
1411 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1412 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1414 clean: archclean vmlinuxclean
1416 # mrproper - Delete all generated files, including .config
1418 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1419 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1420 mrproper-dirs := $(addprefix _mrproper_,scripts)
1422 PHONY += $(mrproper-dirs) mrproper
1424 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1426 mrproper: clean $(mrproper-dirs)
1432 distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS))
1433 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1440 @find $(srctree) $(RCS_FIND_IGNORE) \
1441 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1442 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1443 -o -name 'core' \) \
1444 -type f -print | xargs rm -f
1447 # Packaging of the kernel to various formats
1448 # ---------------------------------------------------------------------------
1451 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1452 %pkg: include/config/kernel.release FORCE
1453 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1455 # Brief documentation of the typical targets used
1456 # ---------------------------------------------------------------------------
1458 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1459 boards := $(sort $(notdir $(boards)))
1460 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1461 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1465 @echo 'Cleaning targets:'
1466 @echo ' clean - Remove most generated files but keep the config and'
1467 @echo ' enough build support to build external modules'
1468 @echo ' mrproper - Remove all generated files + config + various backup files'
1469 @echo ' distclean - mrproper + remove editor backup and patch files'
1471 @echo 'Configuration targets:'
1472 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1474 @echo 'Other generic targets:'
1475 @echo ' all - Build all targets marked with [*]'
1476 @echo '* vmlinux - Build the bare kernel'
1477 @echo '* modules - Build all modules'
1478 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1479 @echo ' dir/ - Build all files in dir and below'
1480 @echo ' dir/file.[ois] - Build specified target only'
1481 @echo ' dir/file.ll - Build the LLVM assembly file'
1482 @echo ' (requires compiler support for LLVM assembly generation)'
1483 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1484 @echo ' (requires a recent binutils and recent build (System.map))'
1485 @echo ' dir/file.ko - Build module including final link'
1486 @echo ' modules_prepare - Set up for building external modules'
1487 @echo ' tags/TAGS - Generate tags file for editors'
1488 @echo ' cscope - Generate cscope index'
1489 @echo ' gtags - Generate GNU GLOBAL index'
1490 @echo ' kernelrelease - Output the release version string (use with make -s)'
1491 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1492 @echo ' image_name - Output the image name (use with make -s)'
1493 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1494 echo ' (default: $(INSTALL_HDR_PATH))'; \
1496 @echo 'Static analysers:'
1497 @echo ' checkstack - Generate a list of stack hogs'
1498 @echo ' namespacecheck - Name space analysis on compiled kernel'
1499 @echo ' versioncheck - Sanity check on version.h usage'
1500 @echo ' includecheck - Check for duplicate included header files'
1501 @echo ' export_report - List the usages of all exported symbols'
1502 @echo ' headerdep - Detect inclusion cycles in headers'
1503 @echo ' coccicheck - Check with Coccinelle'
1506 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1508 @echo 'Kernel selftest:'
1509 @echo ' kselftest - Build and run kernel selftest'
1510 @echo ' Build, install, and boot kernel before'
1511 @echo ' running kselftest on it'
1512 @echo ' Run as root for full coverage'
1513 @echo ' kselftest-all - Build kernel selftest'
1514 @echo ' kselftest-install - Build and install kernel selftest'
1515 @echo ' kselftest-clean - Remove all generated kselftest files'
1516 @echo ' kselftest-merge - Merge all the config dependencies of'
1517 @echo ' kselftest to existing .config.'
1520 echo 'Devicetree:'; \
1521 echo '* dtbs - Build device tree blobs for enabled boards'; \
1522 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1523 echo ' dt_binding_check - Validate device tree binding documents'; \
1524 echo ' dtbs_check - Validate device tree source files';\
1527 @echo 'Userspace tools targets:'
1528 @echo ' use "make tools/help"'
1529 @echo ' or "cd tools; make help"'
1531 @echo 'Kernel packaging:'
1532 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1534 @echo 'Documentation targets:'
1535 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1537 @echo 'Architecture specific targets ($(SRCARCH)):'
1538 @$(if $(archhelp),$(archhelp),\
1539 echo ' No architecture specific help defined for $(SRCARCH)')
1542 $(foreach b, $(boards), \
1543 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1545 @$(if $(board-dirs), \
1546 $(foreach b, $(board-dirs), \
1547 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1548 printf " %-16s - Show all of the above\\n" help-boards; \
1551 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1552 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1553 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1554 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1555 @echo ' (sparse by default)'
1556 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1557 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1558 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1559 @echo ' 1: warnings which may be relevant and do not occur too often'
1560 @echo ' 2: warnings which occur quite often but may still be relevant'
1561 @echo ' 3: more obscure warnings, can most likely be ignored'
1562 @echo ' Multiple levels can be combined with W=12 or W=123'
1564 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1565 @echo 'For further info see the ./README file'
1568 help-board-dirs := $(addprefix help-,$(board-dirs))
1570 help-boards: $(help-board-dirs)
1572 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1574 $(help-board-dirs): help-%:
1575 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1576 @$(if $(boards-per-dir), \
1577 $(foreach b, $(boards-per-dir), \
1578 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1582 # Documentation targets
1583 # ---------------------------------------------------------------------------
1584 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1585 linkcheckdocs dochelp refcheckdocs
1586 PHONY += $(DOC_TARGETS)
1588 $(Q)$(MAKE) $(build)=Documentation $@
1591 # ---------------------------------------------------------------------------
1593 PHONY += scripts_gdb
1594 scripts_gdb: prepare0
1595 $(Q)$(MAKE) $(build)=scripts/gdb
1596 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1598 ifdef CONFIG_GDB_SCRIPTS
1602 else # KBUILD_EXTMOD
1605 # External module support.
1606 # When building external modules the kernel used as basis is considered
1607 # read-only, and no consistency checks are made and the make
1608 # system is not used on the basis kernel. If updates are required
1609 # in the basis kernel ordinary make commands (without M=...) must
1612 # The following are the only valid targets when building external
1614 # make M=dir clean Delete all automatically generated files
1615 # make M=dir modules Make all modules in specified dir
1616 # make M=dir Same as 'make M=dir modules'
1617 # make M=dir modules_install
1618 # Install the modules built in the module directory
1619 # Assumes install directory is already created
1621 # We are always building modules
1624 PHONY += $(objtree)/Module.symvers
1625 $(objtree)/Module.symvers:
1626 @test -e $(objtree)/Module.symvers || ( \
1628 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1629 echo " is missing; modules will have no dependencies and modversions."; \
1632 build-dirs := $(KBUILD_EXTMOD)
1634 modules: descend $(objtree)/Module.symvers
1635 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1637 PHONY += modules_install
1638 modules_install: _emodinst_ _emodinst_post
1640 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1643 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1644 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1646 PHONY += _emodinst_post
1647 _emodinst_post: _emodinst_
1650 clean-dirs := $(KBUILD_EXTMOD)
1651 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1655 @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1659 @echo ' Building external modules.'
1660 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1662 @echo ' modules - default target, build the module(s)'
1663 @echo ' modules_install - install the module'
1664 @echo ' clean - remove generated files in module directory only'
1668 endif # KBUILD_EXTMOD
1671 # ---------------------------------------------------------------------------
1672 # To build individual files in subdirectories, you can do like this:
1674 # make foo/bar/baz.s
1676 # The supported suffixes for single-target are listed in 'single-targets'
1678 # To build only under specific subdirectories, you can do like this:
1684 # .ko is special because modpost is needed
1685 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1686 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1688 $(single-ko): single_modpost
1690 $(single-no-ko): descend
1693 ifeq ($(KBUILD_EXTMOD),)
1694 # For the single build of in-tree modules, use a temporary file to avoid
1695 # the situation of modules_install installing an invalid modules.order.
1696 MODORDER := .modules.tmp
1699 PHONY += single_modpost
1700 single_modpost: $(single-no-ko)
1701 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1702 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1706 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1708 # trim unrelated directories
1709 build-dirs := $(foreach d, $(build-dirs), \
1710 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1714 # Handle descending into subdirectories listed in $(build-dirs)
1715 # Preset locale variables to speed up the build process. Limit locale
1716 # tweaks to this spot to avoid wrong language settings when running
1717 # make menuconfig etc.
1718 # Error messages still appears in the original language
1719 PHONY += descend $(build-dirs)
1720 descend: $(build-dirs)
1721 $(build-dirs): prepare
1722 $(Q)$(MAKE) $(build)=$@ \
1723 single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1724 need-builtin=1 need-modorder=1
1726 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1727 PHONY += $(clean-dirs) clean
1729 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1731 clean: $(clean-dirs)
1734 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1735 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1737 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1738 -o -name '*.dwo' -o -name '*.lst' \
1739 -o -name '*.su' -o -name '*.mod' \
1740 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1741 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1742 -o -name '*.asn1.[ch]' \
1743 -o -name '*.symtypes' -o -name 'modules.order' \
1744 -o -name '.tmp_*.o.*' \
1745 -o -name '*.c.[012]*.*' \
1747 -o -name '*.gcno' \) -type f -print | xargs rm -f
1749 # Generate tags for editors
1750 # ---------------------------------------------------------------------------
1751 quiet_cmd_tags = GEN $@
1752 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1754 tags TAGS cscope gtags: FORCE
1757 # Script to generate missing namespace dependencies
1758 # ---------------------------------------------------------------------------
1761 nsdeps: export KBUILD_NSDEPS=1
1763 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1765 # Scripts to check various things for consistency
1766 # ---------------------------------------------------------------------------
1768 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1771 find $(srctree)/* $(RCS_FIND_IGNORE) \
1772 -name '*.[hcS]' -type f -print | sort \
1773 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1776 find $(srctree)/* $(RCS_FIND_IGNORE) \
1777 -name '*.[hcS]' -type f -print | sort \
1778 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1781 $(Q)$(BASH) $(srctree)/scripts/$@
1784 $(PERL) $(srctree)/scripts/namespace.pl
1787 $(PERL) $(srctree)/scripts/export_report.pl
1789 PHONY += checkstack kernelrelease kernelversion image_name
1791 # UML needs a little special treatment here. It wants to use the host
1792 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1793 # else wants $(ARCH), including people doing cross-builds, which means
1794 # that $(SUBARCH) doesn't work here.
1796 CHECKSTACK_ARCH := $(SUBARCH)
1798 CHECKSTACK_ARCH := $(ARCH)
1801 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1802 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1805 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1808 @echo $(KERNELVERSION)
1811 @echo $(KBUILD_IMAGE)
1813 # Clear a bunch of variables before executing the submake
1815 ifeq ($(quiet),silent_)
1820 $(Q)mkdir -p $(objtree)/tools
1821 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1824 $(Q)mkdir -p $(objtree)/tools
1825 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1827 # FIXME Should go into a make.lib or something
1828 # ===========================================================================
1830 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1831 cmd_rmdirs = rm -rf $(rm-dirs)
1833 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1834 cmd_rmfiles = rm -f $(rm-files)
1836 # Run depmod only if we have System.map and depmod is executable
1837 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1838 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1841 # read saved command lines for existing targets
1842 existing-targets := $(wildcard $(sort $(targets)))
1844 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1846 endif # config-build
1848 endif # need-sub-make
1853 # Declare the contents of the PHONY variable as phony. We keep that
1854 # information in a variable so we can use it in if_changed and friends.