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 $(Q) - that's useful
65 # for commands that shall be hidden in non-verbose mode.
69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
72 # To put more focus on warnings, be less verbose as default
73 # Use 'make V=1' to see the full commands
75 ifeq ("$(origin V)", "command line")
82 ifeq ($(KBUILD_VERBOSE),1)
90 # If the user is running make -s (silent mode), suppress echoing of
92 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
94 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
95 silence:=$(findstring s,$(firstword -$(MAKEFLAGS)))
97 silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS)))
104 export quiet Q KBUILD_VERBOSE
106 # Kbuild will save output files in the current working directory.
107 # This does not need to match to the root of the kernel source tree.
109 # For example, you can do this:
111 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
113 # If you want to save output files in a different location, there are
114 # two syntaxes to specify it.
117 # Use "make O=dir/to/store/output/files/"
119 # 2) Set KBUILD_OUTPUT
120 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
121 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
123 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
126 # Do we want to change the working directory?
127 ifeq ("$(origin O)", "command line")
128 KBUILD_OUTPUT := $(O)
131 ifneq ($(KBUILD_OUTPUT),)
132 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
133 # expand a shell special character '~'. We use a somewhat tedious way here.
134 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
135 $(if $(abs_objtree),, \
136 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
138 # $(realpath ...) resolves symlinks
139 abs_objtree := $(realpath $(abs_objtree))
141 abs_objtree := $(CURDIR)
142 endif # ifneq ($(KBUILD_OUTPUT),)
144 ifeq ($(abs_objtree),$(CURDIR))
145 # Suppress "Entering directory ..." unless we are changing the work directory.
146 MAKEFLAGS += --no-print-directory
151 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
153 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
154 $(error source directory cannot contain spaces or colons)
157 ifneq ($(abs_srctree),$(abs_objtree))
158 # Look for make include files relative to root of kernel src
160 # This does not become effective immediately because MAKEFLAGS is re-parsed
161 # once after the Makefile is read. We need to invoke sub-make.
162 MAKEFLAGS += --include-dir=$(abs_srctree)
166 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
167 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
168 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
170 # Cancel implicit rules for this Makefile.
171 $(lastword $(MAKEFILE_LIST)): ;
174 export abs_srctree abs_objtree
175 export sub_make_done := 1
177 ifeq ($(need-sub-make),1)
179 PHONY += $(MAKECMDGOALS) sub-make
181 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
184 # Invoke a second make in the output directory, passing relevant variables
186 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
188 endif # need-sub-make
189 endif # sub_make_done
191 # We process the rest of the Makefile if this is the final invocation of make
192 ifeq ($(need-sub-make),)
194 # Do not print "Entering directory ...",
195 # but we want to display it when entering to the output directory
196 # so that IDEs/editors are able to understand relative filenames.
197 MAKEFLAGS += --no-print-directory
199 # Call a source code checker (by default, "sparse") as part of the
202 # Use 'make C=1' to enable checking of only re-compiled files.
203 # Use 'make C=2' to enable checking of *all* source files, regardless
204 # of whether they are re-compiled or not.
206 # See the file "Documentation/dev-tools/sparse.rst" for more details,
207 # including where to get the "sparse" utility.
209 ifeq ("$(origin C)", "command line")
210 KBUILD_CHECKSRC = $(C)
212 ifndef KBUILD_CHECKSRC
216 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
217 # directory of external module to build. Setting M= takes precedence.
218 ifeq ("$(origin M)", "command line")
219 KBUILD_EXTMOD := $(M)
222 export KBUILD_CHECKSRC KBUILD_EXTMOD
224 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
226 ifeq ($(abs_srctree),$(abs_objtree))
227 # building in the source tree
229 building_out_of_srctree :=
231 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
232 # building in a subdirectory of the source tree
235 srctree := $(abs_srctree)
237 building_out_of_srctree := 1
240 ifneq ($(KBUILD_ABS_SRCTREE),)
241 srctree := $(abs_srctree)
247 export building_out_of_srctree srctree objtree VPATH
249 # To make sure we do not include .config for any of the *config targets
250 # catch them early, and hand them over to scripts/kconfig/Makefile
251 # It is allowed to specify more targets when calling make, including
252 # mixing *config targets and build targets.
253 # For example 'make oldconfig all'.
254 # Detect when mixed targets is specified, and make a second invocation
255 # of make so .config is not included in this case either (for *config).
257 version_h := include/generated/uapi/linux/version.h
258 old_version_h := include/linux/version.h
260 clean-targets := %clean mrproper cleandocs
261 no-dot-config-targets := $(clean-targets) \
262 cscope gtags TAGS tags help% %docs check% coccicheck \
263 $(version_h) headers headers_% archheaders archscripts \
264 %asm-generic kernelversion %src-pkg
265 no-sync-config-targets := $(no-dot-config-targets) install %install \
267 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
275 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
276 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
281 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
282 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
287 ifneq ($(KBUILD_EXTMOD),)
291 ifeq ($(KBUILD_EXTMOD),)
292 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
294 ifneq ($(words $(MAKECMDGOALS)),1)
300 # We cannot build single targets and the others at the same time
301 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
303 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
308 # For "make -j clean all", "make -j mrproper defconfig all", etc.
309 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
310 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
315 # install and modules_install need also be processed one by one
316 ifneq ($(filter install,$(MAKECMDGOALS)),)
317 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
323 # ===========================================================================
324 # We're called with mixed targets (*config and build targets).
325 # Handle them one by one.
327 PHONY += $(MAKECMDGOALS) __build_one_by_one
329 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
334 for i in $(MAKECMDGOALS); do \
335 $(MAKE) -f $(srctree)/Makefile $$i; \
340 include scripts/Kbuild.include
342 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
343 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
344 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
345 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
347 include scripts/subarch.include
349 # Cross compiling and selecting different set of gcc/bin-utils
350 # ---------------------------------------------------------------------------
352 # When performing cross compilation for other architectures ARCH shall be set
353 # to the target architecture. (See arch/* for the possibilities).
354 # ARCH can be set during invocation of make:
356 # Another way is to have ARCH set in the environment.
357 # The default ARCH is the host where make is executed.
359 # CROSS_COMPILE specify the prefix used for all executables used
360 # during compilation. Only gcc and related bin-utils executables
361 # are prefixed with $(CROSS_COMPILE).
362 # CROSS_COMPILE can be set on the command line
363 # make CROSS_COMPILE=ia64-linux-
364 # Alternatively CROSS_COMPILE can be set in the environment.
365 # Default value for CROSS_COMPILE is not to prefix executables
366 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
369 # Architecture as present in compile.h
370 UTS_MACHINE := $(ARCH)
373 # Additional ARCH settings for x86
377 ifeq ($(ARCH),x86_64)
381 # Additional ARCH settings for sparc
382 ifeq ($(ARCH),sparc32)
385 ifeq ($(ARCH),sparc64)
389 # Additional ARCH settings for sh
394 KCONFIG_CONFIG ?= .config
395 export KCONFIG_CONFIG
397 # SHELL used by kbuild
400 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
401 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
402 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
411 KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
412 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
414 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
415 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
416 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
418 # Make variables (CC, etc...)
425 OBJCOPY = llvm-objcopy
426 OBJDUMP = llvm-objdump
427 READELF = llvm-readelf
431 CC = $(CROSS_COMPILE)gcc
432 LD = $(CROSS_COMPILE)ld
433 AR = $(CROSS_COMPILE)ar
434 NM = $(CROSS_COMPILE)nm
435 OBJCOPY = $(CROSS_COMPILE)objcopy
436 OBJDUMP = $(CROSS_COMPILE)objdump
437 READELF = $(CROSS_COMPILE)readelf
438 OBJSIZE = $(CROSS_COMPILE)size
439 STRIP = $(CROSS_COMPILE)strip
445 INSTALLKERNEL := installkernel
459 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
460 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
469 # Use USERINCLUDE when you must reference the UAPI directories only.
471 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
472 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
473 -I$(srctree)/include/uapi \
474 -I$(objtree)/include/generated/uapi \
475 -include $(srctree)/include/linux/kconfig.h
477 # Use LINUXINCLUDE when you must reference the include/ directory.
478 # Needed to be compatible with the O= option
480 -I$(srctree)/arch/$(SRCARCH)/include \
481 -I$(objtree)/arch/$(SRCARCH)/include/generated \
482 $(if $(building_out_of_srctree),-I$(srctree)/include) \
483 -I$(objtree)/include \
486 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
487 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
488 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
489 -Werror=implicit-function-declaration -Werror=implicit-int \
490 -Werror=return-type -Wno-format-security \
492 KBUILD_CPPFLAGS := -D__KERNEL__
493 KBUILD_AFLAGS_KERNEL :=
494 KBUILD_CFLAGS_KERNEL :=
495 KBUILD_AFLAGS_MODULE := -DMODULE
496 KBUILD_CFLAGS_MODULE := -DMODULE
497 KBUILD_LDFLAGS_MODULE :=
498 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
500 GCC_PLUGINS_CFLAGS :=
503 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
504 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
505 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
506 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ
507 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
509 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
510 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
511 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
512 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
513 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
514 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
516 # Files to ignore in find ... statements
518 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
519 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
521 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
522 --exclude CVS --exclude .pc --exclude .hg --exclude .git
524 # ===========================================================================
525 # Rules shared between *config targets and build targets
527 # Basic helpers built in scripts/basic/
528 PHONY += scripts_basic
530 $(Q)$(MAKE) $(build)=scripts/basic
531 $(Q)rm -f .tmp_quiet_recordmcount
533 PHONY += outputmakefile
534 # Before starting out-of-tree build, make sure the source tree is clean.
535 # outputmakefile generates a Makefile in the output directory, if using a
536 # separate output directory. This allows convenient use of make in the
538 # At the same time when output Makefile generated, generate .gitignore to
539 # ignore whole output directory
541 ifdef building_out_of_srctree
542 $(Q)if [ -f $(srctree)/.config -o \
543 -d $(srctree)/include/config -o \
544 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
546 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
547 echo >&2 "*** in $(abs_srctree)";\
551 $(Q)ln -fsn $(srctree) source
552 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
553 $(Q)test -e .gitignore || \
554 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
557 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
558 ifneq ($(CROSS_COMPILE),)
559 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
560 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
561 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
562 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
564 ifneq ($(GCC_TOOLCHAIN),)
565 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
567 ifneq ($(LLVM_IAS),1)
568 CLANG_FLAGS += -no-integrated-as
570 CLANG_FLAGS += -Werror=unknown-warning-option
571 KBUILD_CFLAGS += $(CLANG_FLAGS)
572 KBUILD_AFLAGS += $(CLANG_FLAGS)
576 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
577 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
578 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
579 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
580 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
583 # ===========================================================================
584 # *config targets only - make sure prerequisites are updated, and descend
585 # in scripts/kconfig to make the *config target
587 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
588 # KBUILD_DEFCONFIG may point out an alternative default configuration
589 # used for 'make defconfig'
590 include arch/$(SRCARCH)/Makefile
591 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
593 config: outputmakefile scripts_basic FORCE
594 $(Q)$(MAKE) $(build)=scripts/kconfig $@
596 %config: outputmakefile scripts_basic FORCE
597 $(Q)$(MAKE) $(build)=scripts/kconfig $@
600 # ===========================================================================
601 # Build targets only - this includes vmlinux, arch specific targets, clean
602 # targets and others. In general all targets except *config targets.
604 # If building an external module we do not care about the all: rule
605 # but instead _all depend on modules
607 ifeq ($(KBUILD_EXTMOD),)
613 # Decide whether to build built-in, modular, or both.
614 # Normally, just do built-in.
619 # If we have only "make modules", don't compile built-in objects.
620 ifeq ($(MAKECMDGOALS),modules)
624 # If we have "make <whatever> modules", compile modules
625 # in addition to whatever we do anyway.
626 # Just "make" or "make all" shall build modules as well
628 ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
632 ifeq ($(MAKECMDGOALS),)
636 export KBUILD_MODULES KBUILD_BUILTIN
639 include include/config/auto.conf
642 ifeq ($(KBUILD_EXTMOD),)
643 # Objects we will link into vmlinux / subdirs we need to visit
645 drivers-y := drivers/ sound/
646 drivers-$(CONFIG_SAMPLES) += samples/
651 endif # KBUILD_EXTMOD
653 # The all: target is the default when no target is given on the
655 # This allow a user to issue only 'make' to build a kernel including modules
656 # Defaults to vmlinux, but the arch makefile usually adds further targets
659 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
660 $(call cc-option,-fno-tree-loop-im) \
661 $(call cc-disable-warning,maybe-uninitialized,)
664 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
665 ifdef CONFIG_FUNCTION_TRACER
666 CC_FLAGS_FTRACE := -pg
669 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
670 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
671 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
672 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
673 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
674 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
675 export RETPOLINE_CFLAGS
676 export RETPOLINE_VDSO_CFLAGS
678 include arch/$(SRCARCH)/Makefile
681 ifdef may-sync-config
682 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
683 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
684 # because some architectures define CROSS_COMPILE there.
685 include include/config/auto.conf.cmd
689 @echo >&2 '*** Configuration file "$@" not found!'
691 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
692 @echo >&2 '*** "make menuconfig" or "make xconfig").'
696 # The actual configuration files used during the build are stored in
697 # include/generated/ and include/config/. Update them if .config is newer than
698 # include/config/auto.conf (which mirrors .config).
700 # This exploits the 'multi-target pattern rule' trick.
701 # The syncconfig should be executed only once to make all the targets.
702 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
703 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
704 else # !may-sync-config
705 # External modules and some install targets need include/generated/autoconf.h
706 # and include/config/auto.conf but do not care if they are up-to-date.
707 # Use auto.conf to trigger the test
708 PHONY += include/config/auto.conf
710 include/config/auto.conf:
711 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
713 echo >&2 " ERROR: Kernel configuration is invalid."; \
714 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
715 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
719 endif # may-sync-config
722 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
723 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
724 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
725 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
726 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
728 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
730 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
732 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
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 += $(call cc-option,-Wframe-larger-than=${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 # Quiet clang warning: comparison of unsigned expression < 0 is always false
768 KBUILD_CFLAGS += -Wno-tautological-compare
769 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
770 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
771 # See modpost pattern 2
772 KBUILD_CFLAGS += -mno-global-merge
775 # Warn about unmarked fall-throughs in switch statement.
776 # Disabled for clang while comment to attribute conversion happens and
777 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
778 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
781 # These warnings generated too much noise in a regular build.
782 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
783 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
785 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
787 # These result in bogus false positives
788 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
790 ifdef CONFIG_FRAME_POINTER
791 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
793 # Some targets (ARM with Thumb2, for example), can't be built with frame
794 # pointers. For those, we don't have FUNCTION_TRACER automatically
795 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
796 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
797 # -fomit-frame-pointer with FUNCTION_TRACER.
798 ifndef CONFIG_FUNCTION_TRACER
799 KBUILD_CFLAGS += -fomit-frame-pointer
803 # Initialize all stack variables with a pattern, if desired.
804 ifdef CONFIG_INIT_STACK_ALL
805 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
808 DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
810 ifdef CONFIG_DEBUG_INFO
811 ifdef CONFIG_DEBUG_INFO_SPLIT
812 DEBUG_CFLAGS += -gsplit-dwarf
819 KBUILD_AFLAGS += -Wa,-gdwarf-2
823 ifdef CONFIG_DEBUG_INFO_DWARF4
824 DEBUG_CFLAGS += -gdwarf-4
827 ifdef CONFIG_DEBUG_INFO_REDUCED
828 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
829 $(call cc-option,-fno-var-tracking)
832 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
835 ifdef CONFIG_FUNCTION_TRACER
836 ifdef CONFIG_FTRACE_MCOUNT_RECORD
837 # gcc 5 supports generating the mcount tables directly
838 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
839 CC_FLAGS_FTRACE += -mrecord-mcount
840 export CC_USING_RECORD_MCOUNT := 1
842 ifdef CONFIG_HAVE_NOP_MCOUNT
843 ifeq ($(call cc-option-yn, -mnop-mcount),y)
844 CC_FLAGS_FTRACE += -mnop-mcount
845 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
849 ifdef CONFIG_HAVE_FENTRY
850 ifeq ($(call cc-option-yn, -mfentry),y)
851 CC_FLAGS_FTRACE += -mfentry
852 CC_FLAGS_USING += -DCC_USING_FENTRY
855 export CC_FLAGS_FTRACE
856 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
857 KBUILD_AFLAGS += $(CC_FLAGS_USING)
858 ifdef CONFIG_DYNAMIC_FTRACE
859 ifdef CONFIG_HAVE_C_RECORDMCOUNT
860 BUILD_C_RECORDMCOUNT := y
861 export BUILD_C_RECORDMCOUNT
866 # We trigger additional mismatches with less inlining
867 ifdef CONFIG_DEBUG_SECTION_MISMATCH
868 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
871 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
872 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
873 LDFLAGS_vmlinux += --gc-sections
876 ifdef CONFIG_LIVEPATCH
877 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
880 # arch Makefile may override CC so keep this after arch Makefile is included
881 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
883 # warn about C99 declaration after statement
884 KBUILD_CFLAGS += -Wdeclaration-after-statement
886 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
887 KBUILD_CFLAGS += -Wvla
889 # disable pointer signed / unsigned warnings in gcc 4.0
890 KBUILD_CFLAGS += -Wno-pointer-sign
892 # disable stringop warnings in gcc 8+
893 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
895 # We'll want to enable this eventually, but it's not going away for 5.7 at least
896 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
897 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
898 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
900 # Another good warning that we'll want to enable eventually
901 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
903 # Enabled with W=2, disabled by default as noisy
904 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
906 # disable invalid "can't wrap" optimizations for signed / pointers
907 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
909 # clang sets -fmerge-all-constants by default as optimization, but this
910 # is non-conforming behavior for C and in fact breaks the kernel, so we
911 # need to disable it here generally.
912 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
914 # for gcc -fno-merge-all-constants disables everything, but it is fine
915 # to have actual conforming behavior enabled.
916 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
918 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
919 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
921 # conserve stack if available
922 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
924 # Prohibit date/time macros, which would make the build non-deterministic
925 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
927 # enforce correct pointer usage
928 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
930 # Require designated initializers for all marked structures
931 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
933 # change __FILE__ to the relative path from the srctree
934 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
936 include scripts/Makefile.kasan
937 include scripts/Makefile.extrawarn
938 include scripts/Makefile.ubsan
940 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
941 KBUILD_CPPFLAGS += $(KCPPFLAGS)
942 KBUILD_AFLAGS += $(KAFLAGS)
943 KBUILD_CFLAGS += $(KCFLAGS)
945 KBUILD_LDFLAGS_MODULE += --build-id
946 LDFLAGS_vmlinux += --build-id
948 KBUILD_LDFLAGS += -z noexecstack
949 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
951 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
952 LDFLAGS_vmlinux += $(call ld-option, -X,)
955 ifeq ($(CONFIG_RELR),y)
956 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
959 # make the checker run with the right architecture
960 CHECKFLAGS += --arch=$(ARCH)
962 # insure the checker run with the right endianness
963 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
965 # the checker needs the correct machine size
966 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
968 # Default kernel image to build when no specific target is given.
969 # KBUILD_IMAGE may be overruled on the command line or
970 # set in the environment
971 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
973 export KBUILD_IMAGE ?= vmlinux
976 # INSTALL_PATH specifies where to place the updated kernel and system map
977 # images. Default is /boot, but you can set it to other values
978 export INSTALL_PATH ?= /boot
981 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
982 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
983 # an argument if needed. Otherwise it defaults to the kernel install path
985 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
988 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
989 # relocations required by build roots. This is not defined in the
990 # makefile but the argument can be passed to make if needed.
993 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
997 # INSTALL_MOD_STRIP, if defined, will cause modules to be
998 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
999 # the default option --strip-debug will be used. Otherwise,
1000 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1002 ifdef INSTALL_MOD_STRIP
1003 ifeq ($(INSTALL_MOD_STRIP),1)
1004 mod_strip_cmd = $(STRIP) --strip-debug
1006 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1007 endif # INSTALL_MOD_STRIP=1
1009 mod_strip_cmd = true
1010 endif # INSTALL_MOD_STRIP
1011 export mod_strip_cmd
1013 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1014 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1015 # or CONFIG_MODULE_COMPRESS_XZ.
1017 mod_compress_cmd = true
1018 ifdef CONFIG_MODULE_COMPRESS
1019 ifdef CONFIG_MODULE_COMPRESS_GZIP
1020 mod_compress_cmd = $(KGZIP) -n -f
1021 endif # CONFIG_MODULE_COMPRESS_GZIP
1022 ifdef CONFIG_MODULE_COMPRESS_XZ
1023 mod_compress_cmd = $(XZ) -f
1024 endif # CONFIG_MODULE_COMPRESS_XZ
1025 endif # CONFIG_MODULE_COMPRESS
1026 export mod_compress_cmd
1028 ifdef CONFIG_MODULE_SIG_ALL
1029 $(eval $(call config_filename,MODULE_SIG_KEY))
1031 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1037 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1039 ifdef CONFIG_STACK_VALIDATION
1040 has_libelf := $(call try-run,\
1041 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1042 ifeq ($(has_libelf),1)
1043 objtool_target := tools/objtool FORCE
1045 SKIP_STACK_VALIDATION := 1
1046 export SKIP_STACK_VALIDATION
1052 export MODORDER := $(extmod-prefix)modules.order
1054 ifeq ($(KBUILD_EXTMOD),)
1055 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1057 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1058 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1059 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1061 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1062 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1063 $(drivers-) $(net-) $(libs-) $(virt-))))
1065 build-dirs := $(vmlinux-dirs)
1066 clean-dirs := $(vmlinux-alldirs)
1068 init-y := $(patsubst %/, %/built-in.a, $(init-y))
1069 core-y := $(patsubst %/, %/built-in.a, $(core-y))
1070 drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1071 net-y := $(patsubst %/, %/built-in.a, $(net-y))
1072 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1073 libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1074 virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1076 # Externally visible symbols (used by link-vmlinux.sh)
1077 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1078 $(drivers-y) $(net-y) $(virt-y)
1079 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1080 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1081 export LDFLAGS_vmlinux
1082 # used by scripts/Makefile.package
1083 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1085 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1087 # Recurse until adjust_autoksyms.sh is satisfied
1088 PHONY += autoksyms_recursive
1089 ifdef CONFIG_TRIM_UNUSED_KSYMS
1090 autoksyms_recursive: descend modules.order
1091 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1092 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1095 # For the kernel to actually contain only the needed exported symbols,
1096 # we have to build modules as well to determine what those symbols are.
1097 # (this can be evaluated only once include/config/auto.conf has been included)
1098 ifdef CONFIG_TRIM_UNUSED_KSYMS
1102 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1105 $(Q)mkdir -p $(dir $@)
1108 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1110 # Final link of vmlinux with optional arch pass after final link
1111 cmd_link-vmlinux = \
1112 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
1113 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1115 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1116 +$(call if_changed,link-vmlinux)
1120 # The actual objects are generated when descending,
1121 # make sure no implicit rule kicks in
1122 $(sort $(vmlinux-deps)): descend ;
1124 filechk_kernel.release = \
1125 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1127 # Store (new) KERNELRELEASE string in include/config/kernel.release
1128 include/config/kernel.release: FORCE
1129 $(call filechk,kernel.release)
1131 # Additional helpers built in scripts/
1132 # Carefully list dependencies so we do not try to build scripts twice
1135 scripts: scripts_basic scripts_dtc
1136 $(Q)$(MAKE) $(build)=$(@)
1138 # Things we need to do before we recursively start building the kernel
1139 # or the modules are listed in "prepare".
1140 # A multi level approach is used. prepareN is processed before prepareN-1.
1141 # archprepare is used in arch Makefiles and when processed asm symlink,
1142 # version.h and scripts_basic is processed / created.
1144 PHONY += prepare archprepare
1146 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1147 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1149 prepare0: archprepare
1150 $(Q)$(MAKE) $(build)=scripts/mod
1151 $(Q)$(MAKE) $(build)=.
1153 # All the preparing..
1154 prepare: prepare0 prepare-objtool
1156 # Support for using generic headers in asm-generic
1157 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1159 PHONY += asm-generic uapi-asm-generic
1160 asm-generic: uapi-asm-generic
1161 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1162 generic=include/asm-generic
1164 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1165 generic=include/uapi/asm-generic
1167 PHONY += prepare-objtool
1168 prepare-objtool: $(objtool_target)
1169 ifeq ($(SKIP_STACK_VALIDATION),1)
1170 ifdef CONFIG_UNWINDER_ORC
1171 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1174 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1178 # Generate some files
1179 # ---------------------------------------------------------------------------
1181 # KERNELRELEASE can change from a few different places, meaning version.h
1182 # needs to be updated, so this check is forced on all builds
1185 define filechk_utsrelease.h
1186 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1187 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1190 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1193 define filechk_version.h
1194 if [ $(SUBLEVEL) -gt 255 ]; then \
1195 echo \#define LINUX_VERSION_CODE $(shell \
1196 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1198 echo \#define LINUX_VERSION_CODE $(shell \
1199 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1201 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1202 ((c) > 255 ? 255 : (c)))'
1205 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1206 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1208 $(call filechk,version.h)
1209 $(Q)rm -f $(old_version_h)
1211 include/generated/utsrelease.h: include/config/kernel.release FORCE
1212 $(call filechk,utsrelease.h)
1216 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1217 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1219 # ---------------------------------------------------------------------------
1222 #Default location for installed headers
1223 export INSTALL_HDR_PATH = $(objtree)/usr
1225 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1226 cmd_headers_install = \
1227 mkdir -p $(INSTALL_HDR_PATH); \
1228 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1229 usr/include $(INSTALL_HDR_PATH)
1231 PHONY += headers_install
1232 headers_install: headers
1233 $(call cmd,headers_install)
1235 PHONY += archheaders archscripts
1237 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1240 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1241 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1242 $(error Headers not exportable for the $(SRCARCH) architecture))
1243 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1244 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1246 # Deprecated. It is no-op now.
1247 PHONY += headers_check
1251 ifdef CONFIG_HEADERS_INSTALL
1255 PHONY += scripts_unifdef
1256 scripts_unifdef: scripts_basic
1257 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1259 # ---------------------------------------------------------------------------
1264 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1267 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1269 PHONY += kselftest-merge
1271 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1272 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1273 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1274 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1276 # ---------------------------------------------------------------------------
1279 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1280 dtstree := arch/$(SRCARCH)/boot/dts
1285 %.dtb: include/config/kernel.release scripts_dtc
1286 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1288 PHONY += dtbs dtbs_install dtbs_check
1289 dtbs: include/config/kernel.release scripts_dtc
1290 $(Q)$(MAKE) $(build)=$(dtstree)
1292 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1293 dtbs: dt_binding_check
1296 dtbs_check: export CHECK_DTBS=1
1300 $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1302 ifdef CONFIG_OF_EARLY_FLATTREE
1308 PHONY += scripts_dtc
1309 scripts_dtc: scripts_basic
1310 $(Q)$(MAKE) $(build)=scripts/dtc
1312 PHONY += dt_binding_check
1313 dt_binding_check: scripts_dtc
1314 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1316 # ---------------------------------------------------------------------------
1319 ifdef CONFIG_MODULES
1321 # By default, build modules as well
1325 # When we're building modules with modversions, we need to consider
1326 # the built-in objects during the descend as well, in order to
1327 # make sure the checksums are up to date before we record them.
1328 ifdef CONFIG_MODVERSIONS
1334 # A module can be listed more than once in obj-m resulting in
1335 # duplicate lines in modules.order files. Those are removed
1336 # using awk while concatenating to the final file.
1339 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1340 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1341 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1343 modules.order: descend
1344 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1346 modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
1348 modules.builtin: $(modbuiltin-dirs)
1349 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1351 PHONY += $(modbuiltin-dirs)
1352 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1353 # here to make it self-healing in case somebody accidentally removes it.
1354 $(modbuiltin-dirs): include/config/tristate.conf
1355 $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1357 # Target to prepare building external modules
1358 PHONY += modules_prepare
1359 modules_prepare: prepare
1361 # Target to install modules
1362 PHONY += modules_install
1363 modules_install: _modinst_ _modinst_post
1367 @rm -rf $(MODLIB)/kernel
1368 @rm -f $(MODLIB)/source
1369 @mkdir -p $(MODLIB)/kernel
1370 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1371 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1372 rm -f $(MODLIB)/build ; \
1373 ln -s $(CURDIR) $(MODLIB)/build ; \
1375 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1376 @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1377 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1378 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1380 # This depmod is only for convenience to give the initial
1381 # boot a modules.dep even before / is mounted read-write. However the
1382 # boot script depmod is the master version.
1383 PHONY += _modinst_post
1384 _modinst_post: _modinst_
1387 ifeq ($(CONFIG_MODULE_SIG), y)
1388 PHONY += modules_sign
1390 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1393 else # CONFIG_MODULES
1395 # Modules not configured
1396 # ---------------------------------------------------------------------------
1398 PHONY += modules modules_install
1399 modules modules_install:
1401 @echo >&2 "The present kernel configuration has modules disabled."
1402 @echo >&2 "Type 'make config' and enable loadable module support."
1403 @echo >&2 "Then build a kernel with module support enabled."
1407 endif # CONFIG_MODULES
1410 # Cleaning is done on three levels.
1411 # make clean Delete most generated files
1412 # Leave enough to build external modules
1413 # make mrproper Delete the current configuration, and all generated files
1414 # make distclean Remove editor backup files, patch leftover files and the like
1416 # Directories & files removed with 'make clean'
1417 CLEAN_DIRS += include/ksym
1418 CLEAN_FILES += modules.builtin.modinfo
1420 # Directories & files removed with 'make mrproper'
1421 MRPROPER_DIRS += include/config include/generated \
1422 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1423 debian/ snap/ tar-install/
1424 MRPROPER_FILES += .config .config.old .version \
1426 signing_key.pem signing_key.priv signing_key.x509 \
1427 x509.genkey extra_certificates signing_key.x509.keyid \
1428 signing_key.x509.signer vmlinux-gdb.py \
1431 # Directories & files removed with 'make distclean'
1433 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1435 # clean - Delete most, but leave enough to build external modules
1437 clean: rm-dirs := $(CLEAN_DIRS)
1438 clean: rm-files := $(CLEAN_FILES)
1440 PHONY += archclean vmlinuxclean
1443 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1444 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1446 clean: archclean vmlinuxclean
1448 # mrproper - Delete all generated files, including .config
1450 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1451 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1452 mrproper-dirs := $(addprefix _mrproper_,scripts)
1454 PHONY += $(mrproper-dirs) mrproper
1456 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1458 mrproper: clean $(mrproper-dirs)
1464 distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS))
1465 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1472 @find $(srctree) $(RCS_FIND_IGNORE) \
1473 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1474 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1475 -o -name 'core' \) \
1476 -type f -print | xargs rm -f
1479 # Packaging of the kernel to various formats
1480 # ---------------------------------------------------------------------------
1483 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1484 %pkg: include/config/kernel.release FORCE
1485 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1487 # Brief documentation of the typical targets used
1488 # ---------------------------------------------------------------------------
1490 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1491 boards := $(sort $(notdir $(boards)))
1492 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1493 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1497 @echo 'Cleaning targets:'
1498 @echo ' clean - Remove most generated files but keep the config and'
1499 @echo ' enough build support to build external modules'
1500 @echo ' mrproper - Remove all generated files + config + various backup files'
1501 @echo ' distclean - mrproper + remove editor backup and patch files'
1503 @echo 'Configuration targets:'
1504 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1506 @echo 'Other generic targets:'
1507 @echo ' all - Build all targets marked with [*]'
1508 @echo '* vmlinux - Build the bare kernel'
1509 @echo '* modules - Build all modules'
1510 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1511 @echo ' dir/ - Build all files in dir and below'
1512 @echo ' dir/file.[ois] - Build specified target only'
1513 @echo ' dir/file.ll - Build the LLVM assembly file'
1514 @echo ' (requires compiler support for LLVM assembly generation)'
1515 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1516 @echo ' (requires a recent binutils and recent build (System.map))'
1517 @echo ' dir/file.ko - Build module including final link'
1518 @echo ' modules_prepare - Set up for building external modules'
1519 @echo ' tags/TAGS - Generate tags file for editors'
1520 @echo ' cscope - Generate cscope index'
1521 @echo ' gtags - Generate GNU GLOBAL index'
1522 @echo ' kernelrelease - Output the release version string (use with make -s)'
1523 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1524 @echo ' image_name - Output the image name (use with make -s)'
1525 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1526 echo ' (default: $(INSTALL_HDR_PATH))'; \
1528 @echo 'Static analysers:'
1529 @echo ' checkstack - Generate a list of stack hogs'
1530 @echo ' namespacecheck - Name space analysis on compiled kernel'
1531 @echo ' versioncheck - Sanity check on version.h usage'
1532 @echo ' includecheck - Check for duplicate included header files'
1533 @echo ' export_report - List the usages of all exported symbols'
1534 @echo ' headerdep - Detect inclusion cycles in headers'
1535 @echo ' coccicheck - Check with Coccinelle'
1538 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1540 @echo 'Kernel selftest:'
1541 @echo ' kselftest - Build and run kernel selftest (run as root)'
1542 @echo ' Build, install, and boot kernel before'
1543 @echo ' running kselftest on it'
1544 @echo ' kselftest-clean - Remove all generated kselftest files'
1545 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1549 echo 'Devicetree:'; \
1550 echo '* dtbs - Build device tree blobs for enabled boards'; \
1551 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1552 echo ' dt_binding_check - Validate device tree binding documents'; \
1553 echo ' dtbs_check - Validate device tree source files';\
1556 @echo 'Userspace tools targets:'
1557 @echo ' use "make tools/help"'
1558 @echo ' or "cd tools; make help"'
1560 @echo 'Kernel packaging:'
1561 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1563 @echo 'Documentation targets:'
1564 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1566 @echo 'Architecture specific targets ($(SRCARCH)):'
1567 @$(if $(archhelp),$(archhelp),\
1568 echo ' No architecture specific help defined for $(SRCARCH)')
1571 $(foreach b, $(boards), \
1572 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1574 @$(if $(board-dirs), \
1575 $(foreach b, $(board-dirs), \
1576 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1577 printf " %-16s - Show all of the above\\n" help-boards; \
1580 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1581 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1582 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1583 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1584 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1585 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1586 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1587 @echo ' 1: warnings which may be relevant and do not occur too often'
1588 @echo ' 2: warnings which occur quite often but may still be relevant'
1589 @echo ' 3: more obscure warnings, can most likely be ignored'
1590 @echo ' Multiple levels can be combined with W=12 or W=123'
1592 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1593 @echo 'For further info see the ./README file'
1596 help-board-dirs := $(addprefix help-,$(board-dirs))
1598 help-boards: $(help-board-dirs)
1600 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1602 $(help-board-dirs): help-%:
1603 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1604 @$(if $(boards-per-dir), \
1605 $(foreach b, $(boards-per-dir), \
1606 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1610 # Documentation targets
1611 # ---------------------------------------------------------------------------
1612 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1613 linkcheckdocs dochelp refcheckdocs
1614 PHONY += $(DOC_TARGETS)
1616 $(Q)$(MAKE) $(build)=Documentation $@
1619 # ---------------------------------------------------------------------------
1621 PHONY += scripts_gdb
1622 scripts_gdb: prepare0
1623 $(Q)$(MAKE) $(build)=scripts/gdb
1624 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1626 ifdef CONFIG_GDB_SCRIPTS
1630 else # KBUILD_EXTMOD
1633 # External module support.
1634 # When building external modules the kernel used as basis is considered
1635 # read-only, and no consistency checks are made and the make
1636 # system is not used on the basis kernel. If updates are required
1637 # in the basis kernel ordinary make commands (without M=...) must
1640 # The following are the only valid targets when building external
1642 # make M=dir clean Delete all automatically generated files
1643 # make M=dir modules Make all modules in specified dir
1644 # make M=dir Same as 'make M=dir modules'
1645 # make M=dir modules_install
1646 # Install the modules built in the module directory
1647 # Assumes install directory is already created
1649 # We are always building modules
1652 PHONY += $(objtree)/Module.symvers
1653 $(objtree)/Module.symvers:
1654 @test -e $(objtree)/Module.symvers || ( \
1656 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1657 echo " is missing; modules will have no dependencies and modversions."; \
1660 build-dirs := $(KBUILD_EXTMOD)
1662 modules: descend $(objtree)/Module.symvers
1663 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1665 PHONY += modules_install
1666 modules_install: _emodinst_ _emodinst_post
1668 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1671 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1672 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1674 PHONY += _emodinst_post
1675 _emodinst_post: _emodinst_
1678 clean-dirs := $(KBUILD_EXTMOD)
1679 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1683 @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1687 @echo ' Building external modules.'
1688 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1690 @echo ' modules - default target, build the module(s)'
1691 @echo ' modules_install - install the module'
1692 @echo ' clean - remove generated files in module directory only'
1696 endif # KBUILD_EXTMOD
1699 # ---------------------------------------------------------------------------
1700 # To build individual files in subdirectories, you can do like this:
1702 # make foo/bar/baz.s
1704 # The supported suffixes for single-target are listed in 'single-targets'
1706 # To build only under specific subdirectories, you can do like this:
1712 # .ko is special because modpost is needed
1713 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1714 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1716 $(single-ko): single_modpost
1718 $(single-no-ko): descend
1721 ifeq ($(KBUILD_EXTMOD),)
1722 # For the single build of in-tree modules, use a temporary file to avoid
1723 # the situation of modules_install installing an invalid modules.order.
1724 MODORDER := .modules.tmp
1727 PHONY += single_modpost
1728 single_modpost: $(single-no-ko)
1729 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1730 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1734 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1736 # trim unrelated directories
1737 build-dirs := $(foreach d, $(build-dirs), \
1738 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1742 # Handle descending into subdirectories listed in $(build-dirs)
1743 # Preset locale variables to speed up the build process. Limit locale
1744 # tweaks to this spot to avoid wrong language settings when running
1745 # make menuconfig etc.
1746 # Error messages still appears in the original language
1747 PHONY += descend $(build-dirs)
1748 descend: $(build-dirs)
1749 $(build-dirs): prepare
1750 $(Q)$(MAKE) $(build)=$@ \
1751 single-build=$(if $(filter-out $@/, $(single-no-ko)),1) \
1752 need-builtin=1 need-modorder=1
1754 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1755 PHONY += $(clean-dirs) clean
1757 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1759 clean: $(clean-dirs)
1762 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1763 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1765 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1766 -o -name '*.dwo' -o -name '*.lst' \
1767 -o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \
1768 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1769 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1770 -o -name '*.asn1.[ch]' \
1771 -o -name '*.symtypes' -o -name 'modules.order' \
1772 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1773 -o -name '*.c.[012]*.*' \
1775 -o -name '*.gcno' \) -type f -print | xargs rm -f
1777 # Generate tags for editors
1778 # ---------------------------------------------------------------------------
1779 quiet_cmd_tags = GEN $@
1780 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1782 tags TAGS cscope gtags: FORCE
1785 # Script to generate missing namespace dependencies
1786 # ---------------------------------------------------------------------------
1791 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps
1792 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1794 # Scripts to check various things for consistency
1795 # ---------------------------------------------------------------------------
1797 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1800 find $(srctree)/* $(RCS_FIND_IGNORE) \
1801 -name '*.[hcS]' -type f -print | sort \
1802 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1805 find $(srctree)/* $(RCS_FIND_IGNORE) \
1806 -name '*.[hcS]' -type f -print | sort \
1807 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1810 $(Q)$(BASH) $(srctree)/scripts/$@
1813 $(PERL) $(srctree)/scripts/namespace.pl
1816 $(PERL) $(srctree)/scripts/export_report.pl
1818 PHONY += checkstack kernelrelease kernelversion image_name
1820 # UML needs a little special treatment here. It wants to use the host
1821 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1822 # else wants $(ARCH), including people doing cross-builds, which means
1823 # that $(SUBARCH) doesn't work here.
1825 CHECKSTACK_ARCH := $(SUBARCH)
1827 CHECKSTACK_ARCH := $(ARCH)
1830 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1831 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1834 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1837 @echo $(KERNELVERSION)
1840 @echo $(KBUILD_IMAGE)
1842 # Clear a bunch of variables before executing the submake
1844 ifeq ($(quiet),silent_)
1849 $(Q)mkdir -p $(objtree)/tools
1850 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1853 $(Q)mkdir -p $(objtree)/tools
1854 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1856 # FIXME Should go into a make.lib or something
1857 # ===========================================================================
1859 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1860 cmd_rmdirs = rm -rf $(rm-dirs)
1862 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1863 cmd_rmfiles = rm -f $(rm-files)
1865 # Run depmod only if we have System.map and depmod is executable
1866 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1867 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1870 # read saved command lines for existing targets
1871 existing-targets := $(wildcard $(sort $(targets)))
1873 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1875 endif # config-targets
1877 endif # need-sub-make
1882 # Declare the contents of the PHONY variable as phony. We keep that
1883 # information in a variable so we can use it in if_changed and friends.