1 # SPDX-License-Identifier: GPL-2.0
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 $(Q) - that's useful
65 # for commands that shall be hidden in non-verbose mode.
69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
72 # To put more focus on warnings, be less verbose as default
73 # Use 'make V=1' to see the full commands
75 ifeq ("$(origin V)", "command line")
82 ifeq ($(KBUILD_VERBOSE),1)
90 # If the user is running make -s (silent mode), suppress echoing of
93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
97 export quiet Q KBUILD_VERBOSE
99 # Kbuild will save output files in the current working directory.
100 # This does not need to match to the root of the kernel source tree.
102 # For example, you can do this:
104 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
106 # If you want to save output files in a different location, there are
107 # two syntaxes to specify it.
110 # Use "make O=dir/to/store/output/files/"
112 # 2) Set KBUILD_OUTPUT
113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
119 # Do we want to change the working directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
124 ifneq ($(KBUILD_OUTPUT),)
125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
126 # expand a shell special character '~'. We use a somewhat tedious way here.
127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
128 $(if $(abs_objtree),, \
129 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
131 # $(realpath ...) resolves symlinks
132 abs_objtree := $(realpath $(abs_objtree))
134 abs_objtree := $(CURDIR)
135 endif # ifneq ($(KBUILD_OUTPUT),)
137 ifeq ($(abs_objtree),$(CURDIR))
138 # Suppress "Entering directory ..." unless we are changing the work directory.
139 MAKEFLAGS += --no-print-directory
144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
147 $(error source directory cannot contain spaces or colons)
150 ifneq ($(abs_srctree),$(abs_objtree))
151 # Look for make include files relative to root of kernel src
153 # This does not become effective immediately because MAKEFLAGS is re-parsed
154 # once after the Makefile is read. We need to invoke sub-make.
155 MAKEFLAGS += --include-dir=$(abs_srctree)
159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
163 # Cancel implicit rules for this Makefile.
164 $(lastword $(MAKEFILE_LIST)): ;
167 export abs_srctree abs_objtree
168 export sub_make_done := 1
170 ifeq ($(need-sub-make),1)
172 PHONY += $(MAKECMDGOALS) sub-make
174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
177 # Invoke a second make in the output directory, passing relevant variables
179 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
181 endif # need-sub-make
182 endif # sub_make_done
184 # We process the rest of the Makefile if this is the final invocation of make
185 ifeq ($(need-sub-make),)
187 # Do not print "Entering directory ...",
188 # but we want to display it when entering to the output directory
189 # so that IDEs/editors are able to understand relative filenames.
190 MAKEFLAGS += --no-print-directory
192 # Call a source code checker (by default, "sparse") as part of the
195 # Use 'make C=1' to enable checking of only re-compiled files.
196 # Use 'make C=2' to enable checking of *all* source files, regardless
197 # of whether they are re-compiled or not.
199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
200 # including where to get the "sparse" utility.
202 ifeq ("$(origin C)", "command line")
203 KBUILD_CHECKSRC = $(C)
205 ifndef KBUILD_CHECKSRC
209 # Use make M=dir to specify directory of external module to build
210 # Old syntax make ... SUBDIRS=$PWD is still supported
211 # Setting the environment variable KBUILD_EXTMOD take precedence
213 $(warning ================= WARNING ================)
214 $(warning 'SUBDIRS' will be removed after Linux 5.3)
216 $(warning If you are building an individual subdirectory)
217 $(warning in the kernel tree, you can do like this:)
218 $(warning $$ make path/to/dir/you/want/to/build/)
219 $(warning (Do not forget the trailing slash))
221 $(warning If you are building an external module,)
222 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
223 $(warning ==========================================)
224 KBUILD_EXTMOD ?= $(SUBDIRS)
227 ifeq ("$(origin M)", "command line")
228 KBUILD_EXTMOD := $(M)
231 ifeq ($(abs_srctree),$(abs_objtree))
232 # building in the source tree
235 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
236 # building in a subdirectory of the source tree
239 srctree := $(abs_srctree)
243 # KBUILD_SRC is only used to distinguish in-tree/out-of-tree build.
244 # Replace it with $(srctree) or something.
245 KBUILD_SRC := $(abs_srctree)
248 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
253 export srctree objtree VPATH
255 # To make sure we do not include .config for any of the *config targets
256 # catch them early, and hand them over to scripts/kconfig/Makefile
257 # It is allowed to specify more targets when calling make, including
258 # mixing *config targets and build targets.
259 # For example 'make oldconfig all'.
260 # Detect when mixed targets is specified, and make a second invocation
261 # of make so .config is not included in this case either (for *config).
263 version_h := include/generated/uapi/linux/version.h
264 old_version_h := include/linux/version.h
266 clean-targets := %clean mrproper cleandocs
267 no-dot-config-targets := $(clean-targets) \
268 cscope gtags TAGS tags help% %docs check% coccicheck \
269 $(version_h) headers headers_% archheaders archscripts \
270 %asm-generic kernelversion %src-pkg
271 no-sync-config-targets := $(no-dot-config-targets) install %install \
279 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
280 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
285 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
286 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
291 ifneq ($(KBUILD_EXTMOD),)
295 ifeq ($(KBUILD_EXTMOD),)
296 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
298 ifneq ($(words $(MAKECMDGOALS)),1)
304 # For "make -j clean all", "make -j mrproper defconfig all", etc.
305 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
306 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
311 # install and modules_install need also be processed one by one
312 ifneq ($(filter install,$(MAKECMDGOALS)),)
313 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
318 ifeq ($(mixed-targets),1)
319 # ===========================================================================
320 # We're called with mixed targets (*config and build targets).
321 # Handle them one by one.
323 PHONY += $(MAKECMDGOALS) __build_one_by_one
325 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
330 for i in $(MAKECMDGOALS); do \
331 $(MAKE) -f $(srctree)/Makefile $$i; \
336 include scripts/Kbuild.include
338 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
339 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
340 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
341 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
343 include scripts/subarch.include
345 # Cross compiling and selecting different set of gcc/bin-utils
346 # ---------------------------------------------------------------------------
348 # When performing cross compilation for other architectures ARCH shall be set
349 # to the target architecture. (See arch/* for the possibilities).
350 # ARCH can be set during invocation of make:
352 # Another way is to have ARCH set in the environment.
353 # The default ARCH is the host where make is executed.
355 # CROSS_COMPILE specify the prefix used for all executables used
356 # during compilation. Only gcc and related bin-utils executables
357 # are prefixed with $(CROSS_COMPILE).
358 # CROSS_COMPILE can be set on the command line
359 # make CROSS_COMPILE=ia64-linux-
360 # Alternatively CROSS_COMPILE can be set in the environment.
361 # Default value for CROSS_COMPILE is not to prefix executables
362 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
365 # Architecture as present in compile.h
366 UTS_MACHINE := $(ARCH)
369 # Additional ARCH settings for x86
373 ifeq ($(ARCH),x86_64)
377 # Additional ARCH settings for sparc
378 ifeq ($(ARCH),sparc32)
381 ifeq ($(ARCH),sparc64)
385 # Additional ARCH settings for sh
390 KCONFIG_CONFIG ?= .config
391 export KCONFIG_CONFIG
393 # SHELL used by kbuild
394 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
395 else if [ -x /bin/bash ]; then echo /bin/bash; \
396 else echo sh; fi ; fi)
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)
404 KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
405 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
407 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
408 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
409 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
411 # Make variables (CC, etc...)
412 AS = $(CROSS_COMPILE)as
413 LD = $(CROSS_COMPILE)ld
414 CC = $(CROSS_COMPILE)gcc
416 AR = $(CROSS_COMPILE)ar
417 NM = $(CROSS_COMPILE)nm
418 STRIP = $(CROSS_COMPILE)strip
419 OBJCOPY = $(CROSS_COMPILE)objcopy
420 OBJDUMP = $(CROSS_COMPILE)objdump
425 INSTALLKERNEL := installkernel
426 DEPMOD = /sbin/depmod
433 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
434 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
443 # Use USERINCLUDE when you must reference the UAPI directories only.
445 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
446 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
447 -I$(srctree)/include/uapi \
448 -I$(objtree)/include/generated/uapi \
449 -include $(srctree)/include/linux/kconfig.h
451 # Use LINUXINCLUDE when you must reference the include/ directory.
452 # Needed to be compatible with the O= option
454 -I$(srctree)/arch/$(SRCARCH)/include \
455 -I$(objtree)/arch/$(SRCARCH)/include/generated \
456 $(if $(filter .,$(srctree)),,-I$(srctree)/include) \
457 -I$(objtree)/include \
460 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
461 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
462 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
463 -Werror=implicit-function-declaration -Werror=implicit-int \
464 -Wno-format-security \
466 KBUILD_CPPFLAGS := -D__KERNEL__
467 KBUILD_AFLAGS_KERNEL :=
468 KBUILD_CFLAGS_KERNEL :=
469 KBUILD_AFLAGS_MODULE := -DMODULE
470 KBUILD_CFLAGS_MODULE := -DMODULE
471 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
473 GCC_PLUGINS_CFLAGS :=
475 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
476 export CPP AR NM STRIP OBJCOPY OBJDUMP PAHOLE KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
477 export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
478 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
480 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
481 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
482 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
483 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
484 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
485 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
486 export KBUILD_ARFLAGS
488 # When compiling out-of-tree modules, put MODVERDIR in the module
489 # tree rather than in the kernel tree. The kernel tree might
491 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
493 # Files to ignore in find ... statements
495 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
496 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
498 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
499 --exclude CVS --exclude .pc --exclude .hg --exclude .git
501 # ===========================================================================
502 # Rules shared between *config targets and build targets
504 # Basic helpers built in scripts/basic/
505 PHONY += scripts_basic
507 $(Q)$(MAKE) $(build)=scripts/basic
508 $(Q)rm -f .tmp_quiet_recordmcount
510 PHONY += outputmakefile
511 # outputmakefile generates a Makefile in the output directory, if using a
512 # separate output directory. This allows convenient use of make in the
514 # At the same time when output Makefile generated, generate .gitignore to
515 # ignore whole output directory
518 $(Q)ln -fsn $(srctree) source
519 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
520 $(Q)test -e .gitignore || \
521 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
524 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
525 ifneq ($(CROSS_COMPILE),)
526 CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%))
527 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
528 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
529 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
531 ifneq ($(GCC_TOOLCHAIN),)
532 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
534 ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
535 CLANG_FLAGS += -no-integrated-as
537 CLANG_FLAGS += -Werror=unknown-warning-option
538 KBUILD_CFLAGS += $(CLANG_FLAGS)
539 KBUILD_AFLAGS += $(CLANG_FLAGS)
543 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
544 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
545 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
546 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
547 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
549 ifeq ($(config-targets),1)
550 # ===========================================================================
551 # *config targets only - make sure prerequisites are updated, and descend
552 # in scripts/kconfig to make the *config target
554 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
555 # KBUILD_DEFCONFIG may point out an alternative default configuration
556 # used for 'make defconfig'
557 include arch/$(SRCARCH)/Makefile
558 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
560 config: scripts_basic outputmakefile FORCE
561 $(Q)$(MAKE) $(build)=scripts/kconfig $@
563 %config: scripts_basic outputmakefile FORCE
564 $(Q)$(MAKE) $(build)=scripts/kconfig $@
567 # ===========================================================================
568 # Build targets only - this includes vmlinux, arch specific targets, clean
569 # targets and others. In general all targets except *config targets.
571 # If building an external module we do not care about the all: rule
572 # but instead _all depend on modules
574 ifeq ($(KBUILD_EXTMOD),)
580 # Decide whether to build built-in, modular, or both.
581 # Normally, just do built-in.
586 # If we have only "make modules", don't compile built-in objects.
587 # When we're building modules with modversions, we need to consider
588 # the built-in objects during the descend as well, in order to
589 # make sure the checksums are up to date before we record them.
591 ifeq ($(MAKECMDGOALS),modules)
592 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
595 # If we have "make <whatever> modules", compile modules
596 # in addition to whatever we do anyway.
597 # Just "make" or "make all" shall build modules as well
599 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
603 ifeq ($(MAKECMDGOALS),)
607 export KBUILD_MODULES KBUILD_BUILTIN
609 ifeq ($(dot-config),1)
610 include include/config/auto.conf
613 ifeq ($(KBUILD_EXTMOD),)
614 # Objects we will link into vmlinux / subdirs we need to visit
616 drivers-y := drivers/ sound/
617 drivers-$(CONFIG_SAMPLES) += samples/
618 drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
623 endif # KBUILD_EXTMOD
625 # The all: target is the default when no target is given on the
627 # This allow a user to issue only 'make' to build a kernel including modules
628 # Defaults to vmlinux, but the arch makefile usually adds further targets
631 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
632 $(call cc-option,-fno-tree-loop-im) \
633 $(call cc-disable-warning,maybe-uninitialized,)
636 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
637 ifdef CONFIG_FUNCTION_TRACER
638 CC_FLAGS_FTRACE := -pg
641 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
642 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
643 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
644 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
645 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
646 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
647 export RETPOLINE_CFLAGS
648 export RETPOLINE_VDSO_CFLAGS
650 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
651 # values of the respective KBUILD_* variables
655 include arch/$(SRCARCH)/Makefile
657 ifeq ($(dot-config),1)
658 ifeq ($(may-sync-config),1)
659 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
660 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
661 # because some architectures define CROSS_COMPILE there.
662 include include/config/auto.conf.cmd
666 @echo >&2 '*** Configuration file "$@" not found!'
668 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
669 @echo >&2 '*** "make menuconfig" or "make xconfig").'
673 # The actual configuration files used during the build are stored in
674 # include/generated/ and include/config/. Update them if .config is newer than
675 # include/config/auto.conf (which mirrors .config).
677 # This exploits the 'multi-target pattern rule' trick.
678 # The syncconfig should be executed only once to make all the targets.
679 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
680 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
682 # External modules and some install targets need include/generated/autoconf.h
683 # and include/config/auto.conf but do not care if they are up-to-date.
684 # Use auto.conf to trigger the test
685 PHONY += include/config/auto.conf
687 include/config/auto.conf:
688 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
690 echo >&2 " ERROR: Kernel configuration is invalid."; \
691 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
692 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
696 endif # may-sync-config
697 endif # $(dot-config)
699 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
700 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
701 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
702 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
703 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
705 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
711 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
712 KBUILD_CFLAGS += -Wno-maybe-uninitialized
715 # Tell gcc to never replace conditional load with a non-conditional one
716 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
718 include scripts/Makefile.kcov
719 include scripts/Makefile.gcc-plugins
721 ifdef CONFIG_READABLE_ASM
722 # Disable optimizations that make assembler listings hard to read.
723 # reorder blocks reorders the control in the function
724 # ipa clone creates specialized cloned functions
725 # partial inlining inlines only parts of functions
726 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
727 $(call cc-option,-fno-ipa-cp-clone,) \
728 $(call cc-option,-fno-partial-inlining)
731 ifneq ($(CONFIG_FRAME_WARN),0)
732 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
735 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
736 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
737 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
739 KBUILD_CFLAGS += $(stackp-flags-y)
741 ifdef CONFIG_CC_IS_CLANG
742 KBUILD_CPPFLAGS += -Qunused-arguments
743 KBUILD_CFLAGS += -Wno-format-invalid-specifier
744 KBUILD_CFLAGS += -Wno-gnu
745 # Quiet clang warning: comparison of unsigned expression < 0 is always false
746 KBUILD_CFLAGS += -Wno-tautological-compare
747 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
748 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
749 # See modpost pattern 2
750 KBUILD_CFLAGS += -mno-global-merge
753 # These warnings generated too much noise in a regular build.
754 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
755 KBUILD_CFLAGS += -Wno-unused-but-set-variable
758 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
759 ifdef CONFIG_FRAME_POINTER
760 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
762 # Some targets (ARM with Thumb2, for example), can't be built with frame
763 # pointers. For those, we don't have FUNCTION_TRACER automatically
764 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
765 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
766 # -fomit-frame-pointer with FUNCTION_TRACER.
767 ifndef CONFIG_FUNCTION_TRACER
768 KBUILD_CFLAGS += -fomit-frame-pointer
772 # Initialize all stack variables with a pattern, if desired.
773 ifdef CONFIG_INIT_STACK_ALL
774 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
777 DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
779 ifdef CONFIG_DEBUG_INFO
780 ifdef CONFIG_DEBUG_INFO_SPLIT
781 DEBUG_CFLAGS += -gsplit-dwarf
785 KBUILD_AFLAGS += -Wa,-gdwarf-2
787 ifdef CONFIG_DEBUG_INFO_DWARF4
788 DEBUG_CFLAGS += -gdwarf-4
791 ifdef CONFIG_DEBUG_INFO_REDUCED
792 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
793 $(call cc-option,-fno-var-tracking)
796 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
799 ifdef CONFIG_FUNCTION_TRACER
800 ifdef CONFIG_FTRACE_MCOUNT_RECORD
801 # gcc 5 supports generating the mcount tables directly
802 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
803 CC_FLAGS_FTRACE += -mrecord-mcount
804 export CC_USING_RECORD_MCOUNT := 1
806 ifdef CONFIG_HAVE_NOP_MCOUNT
807 ifeq ($(call cc-option-yn, -mnop-mcount),y)
808 CC_FLAGS_FTRACE += -mnop-mcount
809 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
813 ifdef CONFIG_HAVE_FENTRY
814 ifeq ($(call cc-option-yn, -mfentry),y)
815 CC_FLAGS_FTRACE += -mfentry
816 CC_FLAGS_USING += -DCC_USING_FENTRY
819 export CC_FLAGS_FTRACE
820 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
821 KBUILD_AFLAGS += $(CC_FLAGS_USING)
822 ifdef CONFIG_DYNAMIC_FTRACE
823 ifdef CONFIG_HAVE_C_RECORDMCOUNT
824 BUILD_C_RECORDMCOUNT := y
825 export BUILD_C_RECORDMCOUNT
830 # We trigger additional mismatches with less inlining
831 ifdef CONFIG_DEBUG_SECTION_MISMATCH
832 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
835 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
836 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
837 LDFLAGS_vmlinux += --gc-sections
840 ifdef CONFIG_LIVEPATCH
841 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
844 # arch Makefile may override CC so keep this after arch Makefile is included
845 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
847 # warn about C99 declaration after statement
848 KBUILD_CFLAGS += -Wdeclaration-after-statement
850 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
851 KBUILD_CFLAGS += -Wvla
853 # disable pointer signed / unsigned warnings in gcc 4.0
854 KBUILD_CFLAGS += -Wno-pointer-sign
856 # disable stringop warnings in gcc 8+
857 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
859 # disable invalid "can't wrap" optimizations for signed / pointers
860 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
862 # clang sets -fmerge-all-constants by default as optimization, but this
863 # is non-conforming behavior for C and in fact breaks the kernel, so we
864 # need to disable it here generally.
865 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
867 # for gcc -fno-merge-all-constants disables everything, but it is fine
868 # to have actual conforming behavior enabled.
869 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
871 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
872 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
874 # conserve stack if available
875 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
877 # Prohibit date/time macros, which would make the build non-deterministic
878 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
880 # enforce correct pointer usage
881 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
883 # Require designated initializers for all marked structures
884 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
886 # change __FILE__ to the relative path from the srctree
887 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
889 # use the deterministic mode of AR if available
890 KBUILD_ARFLAGS := $(call ar-option,D)
892 include scripts/Makefile.kasan
893 include scripts/Makefile.extrawarn
894 include scripts/Makefile.ubsan
896 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
898 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
899 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
900 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
902 # Use --build-id when available.
903 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
904 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
905 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
907 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
908 LDFLAGS_vmlinux += $(call ld-option, -X,)
911 # insure the checker run with the right endianness
912 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
914 # the checker needs the correct machine size
915 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
917 # Default kernel image to build when no specific target is given.
918 # KBUILD_IMAGE may be overruled on the command line or
919 # set in the environment
920 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
922 export KBUILD_IMAGE ?= vmlinux
925 # INSTALL_PATH specifies where to place the updated kernel and system map
926 # images. Default is /boot, but you can set it to other values
927 export INSTALL_PATH ?= /boot
930 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
931 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
932 # an argument if needed. Otherwise it defaults to the kernel install path
934 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
937 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
938 # relocations required by build roots. This is not defined in the
939 # makefile but the argument can be passed to make if needed.
942 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
946 # INSTALL_MOD_STRIP, if defined, will cause modules to be
947 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
948 # the default option --strip-debug will be used. Otherwise,
949 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
951 ifdef INSTALL_MOD_STRIP
952 ifeq ($(INSTALL_MOD_STRIP),1)
953 mod_strip_cmd = $(STRIP) --strip-debug
955 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
956 endif # INSTALL_MOD_STRIP=1
959 endif # INSTALL_MOD_STRIP
962 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
963 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
964 # or CONFIG_MODULE_COMPRESS_XZ.
966 mod_compress_cmd = true
967 ifdef CONFIG_MODULE_COMPRESS
968 ifdef CONFIG_MODULE_COMPRESS_GZIP
969 mod_compress_cmd = gzip -n -f
970 endif # CONFIG_MODULE_COMPRESS_GZIP
971 ifdef CONFIG_MODULE_COMPRESS_XZ
972 mod_compress_cmd = xz -f
973 endif # CONFIG_MODULE_COMPRESS_XZ
974 endif # CONFIG_MODULE_COMPRESS
975 export mod_compress_cmd
977 ifdef CONFIG_MODULE_SIG_ALL
978 $(eval $(call config_filename,MODULE_SIG_KEY))
980 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
986 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
988 ifdef CONFIG_STACK_VALIDATION
989 has_libelf := $(call try-run,\
990 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
991 ifeq ($(has_libelf),1)
992 objtool_target := tools/objtool FORCE
994 SKIP_STACK_VALIDATION := 1
995 export SKIP_STACK_VALIDATION
1001 ifeq ($(KBUILD_EXTMOD),)
1002 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1004 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1005 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1006 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1008 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1009 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1010 $(drivers-) $(net-) $(libs-) $(virt-))))
1012 init-y := $(patsubst %/, %/built-in.a, $(init-y))
1013 core-y := $(patsubst %/, %/built-in.a, $(core-y))
1014 drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1015 net-y := $(patsubst %/, %/built-in.a, $(net-y))
1016 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1017 libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1018 virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1020 # Externally visible symbols (used by link-vmlinux.sh)
1021 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1022 $(drivers-y) $(net-y) $(virt-y)
1023 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1024 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1025 export LDFLAGS_vmlinux
1026 # used by scripts/package/Makefile
1027 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1029 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1031 # Recurse until adjust_autoksyms.sh is satisfied
1032 PHONY += autoksyms_recursive
1033 autoksyms_recursive: $(vmlinux-deps)
1034 ifdef CONFIG_TRIM_UNUSED_KSYMS
1035 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1036 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1039 # For the kernel to actually contain only the needed exported symbols,
1040 # we have to build modules as well to determine what those symbols are.
1041 # (this can be evaluated only once include/config/auto.conf has been included)
1042 ifdef CONFIG_TRIM_UNUSED_KSYMS
1046 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1049 $(Q)mkdir -p $(dir $@)
1052 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1054 # Final link of vmlinux with optional arch pass after final link
1055 cmd_link-vmlinux = \
1056 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
1057 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1059 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1060 +$(call if_changed,link-vmlinux)
1064 # The actual objects are generated when descending,
1065 # make sure no implicit rule kicks in
1066 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1068 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1069 # Preset locale variables to speed up the build process. Limit locale
1070 # tweaks to this spot to avoid wrong language settings when running
1071 # make menuconfig etc.
1072 # Error messages still appears in the original language
1074 PHONY += $(vmlinux-dirs)
1075 $(vmlinux-dirs): prepare
1076 $(Q)$(MAKE) $(build)=$@ need-builtin=1
1078 filechk_kernel.release = \
1079 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1081 # Store (new) KERNELRELEASE string in include/config/kernel.release
1082 include/config/kernel.release: FORCE
1083 $(call filechk,kernel.release)
1085 # Additional helpers built in scripts/
1086 # Carefully list dependencies so we do not try to build scripts twice
1089 scripts: scripts_basic scripts_dtc
1090 $(Q)$(MAKE) $(build)=$(@)
1092 # Things we need to do before we recursively start building the kernel
1093 # or the modules are listed in "prepare".
1094 # A multi level approach is used. prepareN is processed before prepareN-1.
1095 # archprepare is used in arch Makefiles and when processed asm symlink,
1096 # version.h and scripts_basic is processed / created.
1098 PHONY += prepare archprepare prepare1 prepare3
1100 # prepare3 is used to check if we are building in a separate output directory,
1102 # 1) Check that make has not been executed in the kernel src $(srctree)
1103 prepare3: include/config/kernel.release
1104 ifneq ($(srctree),.)
1105 @$(kecho) ' Using $(srctree) as source for kernel'
1106 $(Q)if [ -f $(srctree)/.config -o \
1107 -d $(srctree)/include/config -o \
1108 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1109 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1110 echo >&2 " in the '$(srctree)' directory.";\
1115 prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
1116 include/generated/utsrelease.h
1119 archprepare: archheaders archscripts prepare1 scripts
1121 prepare0: archprepare
1122 $(Q)$(MAKE) $(build)=scripts/mod
1123 $(Q)$(MAKE) $(build)=.
1125 # All the preparing..
1126 prepare: prepare0 prepare-objtool
1128 # Support for using generic headers in asm-generic
1129 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1131 PHONY += asm-generic uapi-asm-generic
1132 asm-generic: uapi-asm-generic
1133 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1134 generic=include/asm-generic
1136 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1137 generic=include/uapi/asm-generic
1139 PHONY += prepare-objtool
1140 prepare-objtool: $(objtool_target)
1141 ifeq ($(SKIP_STACK_VALIDATION),1)
1142 ifdef CONFIG_UNWINDER_ORC
1143 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1146 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1150 # Generate some files
1151 # ---------------------------------------------------------------------------
1153 # KERNELRELEASE can change from a few different places, meaning version.h
1154 # needs to be updated, so this check is forced on all builds
1157 define filechk_utsrelease.h
1158 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1159 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1162 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1165 define filechk_version.h
1166 echo \#define LINUX_VERSION_CODE $(shell \
1167 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1168 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1172 $(call filechk,version.h)
1173 $(Q)rm -f $(old_version_h)
1175 include/generated/utsrelease.h: include/config/kernel.release FORCE
1176 $(call filechk,utsrelease.h)
1180 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1181 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1183 # ---------------------------------------------------------------------------
1186 #Default location for installed headers
1187 export INSTALL_HDR_PATH = $(objtree)/usr
1189 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1190 cmd_headers_install = \
1191 mkdir -p $(INSTALL_HDR_PATH); \
1192 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1193 usr/include $(INSTALL_HDR_PATH)
1195 PHONY += headers_install
1196 headers_install: headers
1197 $(call cmd,headers_install)
1199 PHONY += archheaders archscripts
1201 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1204 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1205 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1206 $(error Headers not exportable for the $(SRCARCH) architecture))
1207 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1208 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1210 PHONY += headers_check
1211 headers_check: headers
1212 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1213 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1215 ifdef CONFIG_HEADERS_INSTALL
1219 ifdef CONFIG_HEADERS_CHECK
1223 PHONY += scripts_unifdef
1224 scripts_unifdef: scripts_basic
1225 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1227 # ---------------------------------------------------------------------------
1232 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1234 PHONY += kselftest-clean
1236 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1238 PHONY += kselftest-merge
1240 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1241 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1242 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1243 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1245 # ---------------------------------------------------------------------------
1248 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1249 dtstree := arch/$(SRCARCH)/boot/dts
1254 %.dtb: prepare3 scripts_dtc
1255 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1257 PHONY += dtbs dtbs_install dt_binding_check
1258 dtbs dtbs_check: prepare3 scripts_dtc
1259 $(Q)$(MAKE) $(build)=$(dtstree)
1261 dtbs_check: export CHECK_DTBS=1
1262 dtbs_check: dt_binding_check
1265 $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1267 ifdef CONFIG_OF_EARLY_FLATTREE
1273 PHONY += scripts_dtc
1274 scripts_dtc: scripts_basic
1275 $(Q)$(MAKE) $(build)=scripts/dtc
1277 dt_binding_check: scripts_dtc
1278 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1280 # ---------------------------------------------------------------------------
1283 ifdef CONFIG_MODULES
1285 # By default, build modules as well
1291 # A module can be listed more than once in obj-m resulting in
1292 # duplicate lines in modules.order files. Those are removed
1293 # using awk while concatenating to the final file.
1296 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1297 @$(kecho) ' Building modules, stage 2.';
1298 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1299 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1301 modules.order: $(vmlinux-dirs)
1302 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1304 modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs))
1306 modules.builtin: $(modbuiltin-dirs)
1307 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1309 PHONY += $(modbuiltin-dirs)
1310 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1311 # here to make it self-healing in case somebody accidentally removes it.
1312 $(modbuiltin-dirs): include/config/tristate.conf
1313 $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1315 # Target to prepare building external modules
1316 PHONY += modules_prepare
1317 modules_prepare: prepare
1319 # Target to install modules
1320 PHONY += modules_install
1321 modules_install: _modinst_ _modinst_post
1325 @rm -rf $(MODLIB)/kernel
1326 @rm -f $(MODLIB)/source
1327 @mkdir -p $(MODLIB)/kernel
1328 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1329 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1330 rm -f $(MODLIB)/build ; \
1331 ln -s $(CURDIR) $(MODLIB)/build ; \
1333 @cp -f $(objtree)/modules.order $(MODLIB)/
1334 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1335 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1336 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1338 # This depmod is only for convenience to give the initial
1339 # boot a modules.dep even before / is mounted read-write. However the
1340 # boot script depmod is the master version.
1341 PHONY += _modinst_post
1342 _modinst_post: _modinst_
1345 ifeq ($(CONFIG_MODULE_SIG), y)
1346 PHONY += modules_sign
1348 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1351 else # CONFIG_MODULES
1353 # Modules not configured
1354 # ---------------------------------------------------------------------------
1356 PHONY += modules modules_install
1357 modules modules_install:
1359 @echo >&2 "The present kernel configuration has modules disabled."
1360 @echo >&2 "Type 'make config' and enable loadable module support."
1361 @echo >&2 "Then build a kernel with module support enabled."
1365 endif # CONFIG_MODULES
1368 # Cleaning is done on three levels.
1369 # make clean Delete most generated files
1370 # Leave enough to build external modules
1371 # make mrproper Delete the current configuration, and all generated files
1372 # make distclean Remove editor backup files, patch leftover files and the like
1374 # Directories & files removed with 'make clean'
1375 CLEAN_DIRS += $(MODVERDIR) include/ksym
1376 CLEAN_FILES += modules.builtin.modinfo
1378 # Directories & files removed with 'make mrproper'
1379 MRPROPER_DIRS += include/config include/generated \
1380 arch/$(SRCARCH)/include/generated .tmp_objdiff
1381 MRPROPER_FILES += .config .config.old .version \
1382 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1383 signing_key.pem signing_key.priv signing_key.x509 \
1384 x509.genkey extra_certificates signing_key.x509.keyid \
1385 signing_key.x509.signer vmlinux-gdb.py
1387 # clean - Delete most, but leave enough to build external modules
1389 clean: rm-dirs := $(CLEAN_DIRS)
1390 clean: rm-files := $(CLEAN_FILES)
1391 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs))
1393 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1395 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1398 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1399 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1401 clean: archclean vmlinuxclean
1403 # mrproper - Delete all generated files, including .config
1405 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1406 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1407 mrproper-dirs := $(addprefix _mrproper_,scripts)
1409 PHONY += $(mrproper-dirs) mrproper
1411 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1413 mrproper: clean $(mrproper-dirs)
1422 @find $(srctree) $(RCS_FIND_IGNORE) \
1423 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1424 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1425 -o -name 'core' \) \
1426 -type f -print | xargs rm -f
1429 # Packaging of the kernel to various formats
1430 # ---------------------------------------------------------------------------
1431 package-dir := scripts/package
1434 $(Q)$(MAKE) $(build)=$(package-dir) $@
1435 %pkg: include/config/kernel.release FORCE
1436 $(Q)$(MAKE) $(build)=$(package-dir) $@
1439 # Brief documentation of the typical targets used
1440 # ---------------------------------------------------------------------------
1442 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1443 boards := $(sort $(notdir $(boards)))
1444 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1445 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1449 @echo 'Cleaning targets:'
1450 @echo ' clean - Remove most generated files but keep the config and'
1451 @echo ' enough build support to build external modules'
1452 @echo ' mrproper - Remove all generated files + config + various backup files'
1453 @echo ' distclean - mrproper + remove editor backup and patch files'
1455 @echo 'Configuration targets:'
1456 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1458 @echo 'Other generic targets:'
1459 @echo ' all - Build all targets marked with [*]'
1460 @echo '* vmlinux - Build the bare kernel'
1461 @echo '* modules - Build all modules'
1462 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1463 @echo ' dir/ - Build all files in dir and below'
1464 @echo ' dir/file.[ois] - Build specified target only'
1465 @echo ' dir/file.ll - Build the LLVM assembly file'
1466 @echo ' (requires compiler support for LLVM assembly generation)'
1467 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1468 @echo ' (requires a recent binutils and recent build (System.map))'
1469 @echo ' dir/file.ko - Build module including final link'
1470 @echo ' modules_prepare - Set up for building external modules'
1471 @echo ' tags/TAGS - Generate tags file for editors'
1472 @echo ' cscope - Generate cscope index'
1473 @echo ' gtags - Generate GNU GLOBAL index'
1474 @echo ' kernelrelease - Output the release version string (use with make -s)'
1475 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1476 @echo ' image_name - Output the image name (use with make -s)'
1477 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1478 echo ' (default: $(INSTALL_HDR_PATH))'; \
1480 @echo 'Static analysers:'
1481 @echo ' checkstack - Generate a list of stack hogs'
1482 @echo ' namespacecheck - Name space analysis on compiled kernel'
1483 @echo ' versioncheck - Sanity check on version.h usage'
1484 @echo ' includecheck - Check for duplicate included header files'
1485 @echo ' export_report - List the usages of all exported symbols'
1486 @echo ' headers_check - Sanity check on exported headers'
1487 @echo ' headerdep - Detect inclusion cycles in headers'
1488 @echo ' coccicheck - Check with Coccinelle'
1490 @echo 'Kernel selftest:'
1491 @echo ' kselftest - Build and run kernel selftest (run as root)'
1492 @echo ' Build, install, and boot kernel before'
1493 @echo ' running kselftest on it'
1494 @echo ' kselftest-clean - Remove all generated kselftest files'
1495 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1499 echo 'Devicetree:'; \
1500 echo '* dtbs - Build device tree blobs for enabled boards'; \
1501 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1504 @echo 'Userspace tools targets:'
1505 @echo ' use "make tools/help"'
1506 @echo ' or "cd tools; make help"'
1508 @echo 'Kernel packaging:'
1509 @$(MAKE) $(build)=$(package-dir) help
1511 @echo 'Documentation targets:'
1512 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1514 @echo 'Architecture specific targets ($(SRCARCH)):'
1515 @$(if $(archhelp),$(archhelp),\
1516 echo ' No architecture specific help defined for $(SRCARCH)')
1519 $(foreach b, $(boards), \
1520 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1522 @$(if $(board-dirs), \
1523 $(foreach b, $(board-dirs), \
1524 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1525 printf " %-16s - Show all of the above\\n" help-boards; \
1528 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1529 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1530 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1531 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1532 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1533 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1534 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1535 @echo ' 1: warnings which may be relevant and do not occur too often'
1536 @echo ' 2: warnings which occur quite often but may still be relevant'
1537 @echo ' 3: more obscure warnings, can most likely be ignored'
1538 @echo ' Multiple levels can be combined with W=12 or W=123'
1540 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1541 @echo 'For further info see the ./README file'
1544 help-board-dirs := $(addprefix help-,$(board-dirs))
1546 help-boards: $(help-board-dirs)
1548 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1550 $(help-board-dirs): help-%:
1551 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1552 @$(if $(boards-per-dir), \
1553 $(foreach b, $(boards-per-dir), \
1554 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1558 # Documentation targets
1559 # ---------------------------------------------------------------------------
1560 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1561 linkcheckdocs dochelp refcheckdocs
1562 PHONY += $(DOC_TARGETS)
1563 $(DOC_TARGETS): scripts_basic FORCE
1564 $(Q)$(MAKE) $(build)=Documentation $@
1567 # ---------------------------------------------------------------------------
1569 PHONY += scripts_gdb
1570 scripts_gdb: prepare0
1571 $(Q)$(MAKE) $(build)=scripts/gdb
1572 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1574 ifdef CONFIG_GDB_SCRIPTS
1578 else # KBUILD_EXTMOD
1581 # External module support.
1582 # When building external modules the kernel used as basis is considered
1583 # read-only, and no consistency checks are made and the make
1584 # system is not used on the basis kernel. If updates are required
1585 # in the basis kernel ordinary make commands (without M=...) must
1588 # The following are the only valid targets when building external
1590 # make M=dir clean Delete all automatically generated files
1591 # make M=dir modules Make all modules in specified dir
1592 # make M=dir Same as 'make M=dir modules'
1593 # make M=dir modules_install
1594 # Install the modules built in the module directory
1595 # Assumes install directory is already created
1597 # We are always building modules
1600 PHONY += $(objtree)/Module.symvers
1601 $(objtree)/Module.symvers:
1602 @test -e $(objtree)/Module.symvers || ( \
1604 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1605 echo " is missing; modules will have no dependencies and modversions."; \
1608 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1609 PHONY += $(module-dirs) modules
1610 $(module-dirs): prepare $(objtree)/Module.symvers
1611 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1613 modules: $(module-dirs)
1614 @$(kecho) ' Building modules, stage 2.';
1615 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1617 PHONY += modules_install
1618 modules_install: _emodinst_ _emodinst_post
1620 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1623 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1624 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1626 PHONY += _emodinst_post
1627 _emodinst_post: _emodinst_
1630 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1632 PHONY += $(clean-dirs) clean
1634 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1636 clean: rm-dirs := $(MODVERDIR)
1637 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1641 @echo ' Building external modules.'
1642 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1644 @echo ' modules - default target, build the module(s)'
1645 @echo ' modules_install - install the module'
1646 @echo ' clean - remove generated files in module directory only'
1652 endif # KBUILD_EXTMOD
1654 clean: $(clean-dirs)
1657 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1658 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1660 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1661 -o -name '*.dwo' -o -name '*.lst' \
1663 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1664 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1665 -o -name '*.asn1.[ch]' \
1666 -o -name '*.symtypes' -o -name 'modules.order' \
1667 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1668 -o -name '*.c.[012]*.*' \
1670 -o -name '*.gcno' \) -type f -print | xargs rm -f
1672 # Generate tags for editors
1673 # ---------------------------------------------------------------------------
1674 quiet_cmd_tags = GEN $@
1675 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1677 tags TAGS cscope gtags: FORCE
1680 # Scripts to check various things for consistency
1681 # ---------------------------------------------------------------------------
1683 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1686 find $(srctree)/* $(RCS_FIND_IGNORE) \
1687 -name '*.[hcS]' -type f -print | sort \
1688 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1691 find $(srctree)/* $(RCS_FIND_IGNORE) \
1692 -name '*.[hcS]' -type f -print | sort \
1693 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1696 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1699 $(PERL) $(srctree)/scripts/namespace.pl
1702 $(PERL) $(srctree)/scripts/export_report.pl
1704 PHONY += checkstack kernelrelease kernelversion image_name
1706 # UML needs a little special treatment here. It wants to use the host
1707 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1708 # else wants $(ARCH), including people doing cross-builds, which means
1709 # that $(SUBARCH) doesn't work here.
1711 CHECKSTACK_ARCH := $(SUBARCH)
1713 CHECKSTACK_ARCH := $(ARCH)
1716 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1717 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1720 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1723 @echo $(KERNELVERSION)
1726 @echo $(KBUILD_IMAGE)
1728 # Clear a bunch of variables before executing the submake
1730 ifeq ($(quiet),silent_)
1735 $(Q)mkdir -p $(objtree)/tools
1736 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1739 $(Q)mkdir -p $(objtree)/tools
1740 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1743 # ---------------------------------------------------------------------------
1744 # Single targets are compatible with:
1745 # - build with mixed source and output
1746 # - build with separate output dir 'make O=...'
1747 # - external modules
1749 # target-dir => where to store outputfile
1750 # build-dir => directory in kernel source tree to use
1752 build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1753 build-dir = $(patsubst %/,%,$(dir $(build-target)))
1756 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1758 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1759 %.lst: prepare FORCE
1760 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1762 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1764 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1765 %.symtypes: prepare FORCE
1766 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1768 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1775 $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)
1777 # FIXME Should go into a make.lib or something
1778 # ===========================================================================
1780 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1781 cmd_rmdirs = rm -rf $(rm-dirs)
1783 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1784 cmd_rmfiles = rm -f $(rm-files)
1786 # Run depmod only if we have System.map and depmod is executable
1787 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1788 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1791 # Create temporary dir for module support files
1792 # clean it up only when building all modules
1793 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1794 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1796 # read saved command lines for existing targets
1797 existing-targets := $(wildcard $(sort $(targets)))
1799 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1801 endif # ifeq ($(config-targets),1)
1802 endif # ifeq ($(mixed-targets),1)
1803 endif # need-sub-make
1808 # Declare the contents of the PHONY variable as phony. We keep that
1809 # information in a variable so we can use it in if_changed and friends.