1 # SPDX-License-Identifier: GPL-2.0
6 NAME = "People's Front"
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 # o Do not use make's built-in rules and variables
19 # (this increases performance and avoids hard-to-debug behaviour);
20 # o Look for make include files relative to root of kernel src
21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
23 # Avoid funny character set dependencies
27 export LC_COLLATE LC_NUMERIC
29 # Avoid interference with shell env settings
32 # We are using a recursive build, so we need to do a little thinking
33 # to get the ordering right.
35 # Most importantly: sub-Makefiles should only ever modify files in
36 # their own directory. If in some directory we have a dependency on
37 # a file in another dir (which doesn't happen often, but it's often
38 # unavoidable when linking the built-in.a targets which finally
39 # turn into vmlinux), we will call a sub make in that other dir, and
40 # after that we are sure that everything which is in that other dir
43 # The only cases where we need to modify files which have global
44 # effects are thus separated out and done before the recursive
45 # descending is started. They are now explicitly listed as the
49 # ---------------------------------------------------------------------------
51 # Normally, we echo the whole command before executing it. By making
52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
53 # $(quiet) to choose other forms of output instead, e.g.
55 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
56 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
58 # If $(quiet) is empty, the whole command will be printed.
59 # If it is set to "quiet_", only the short version will be printed.
60 # If it is set to "silent_", nothing will be printed at all, since
61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
63 # A simple variant is to prefix commands with $(Q) - that's useful
64 # for commands that shall be hidden in non-verbose mode.
68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
71 # To put more focus on warnings, be less verbose as default
72 # Use 'make V=1' to see the full commands
74 ifeq ("$(origin V)", "command line")
81 ifeq ($(KBUILD_VERBOSE),1)
89 # If the user is running make -s (silent mode), suppress echoing of
91 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
93 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
94 silence:=$(findstring s,$(firstword -$(MAKEFLAGS)))
96 silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS)))
104 export quiet Q KBUILD_VERBOSE
106 # kbuild supports saving output files in a separate directory.
107 # To locate output files in a separate directory two syntaxes are supported.
108 # In both cases the working directory must be the root of the kernel src.
110 # Use "make O=dir/to/store/output/files/"
112 # 2) Set KBUILD_OUTPUT
113 # Set the environment variable KBUILD_OUTPUT to point to the directory
114 # where the output files shall be placed.
115 # export KBUILD_OUTPUT=dir/to/store/output/files/
118 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
121 # KBUILD_SRC is not intended to be used by the regular user (for now),
122 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
123 ifeq ($(KBUILD_SRC),)
125 # OK, Make called in directory where kernel src resides
126 # Do we want to locate output files in a separate directory?
127 ifeq ("$(origin O)", "command line")
128 KBUILD_OUTPUT := $(O)
131 # Cancel implicit rules on top Makefile
132 $(CURDIR)/Makefile Makefile: ;
134 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
135 $(error main directory cannot contain spaces nor colons)
138 ifneq ($(KBUILD_OUTPUT),)
139 # check that the output directory actually exists
140 saved-output := $(KBUILD_OUTPUT)
141 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
143 $(if $(KBUILD_OUTPUT),, \
144 $(error failed to create output directory "$(saved-output)"))
146 PHONY += $(MAKECMDGOALS) sub-make
148 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
151 # Invoke a second make in the output directory, passing relevant variables
153 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
154 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
156 # Leave processing to above invocation of make
158 endif # ifneq ($(KBUILD_OUTPUT),)
159 endif # ifeq ($(KBUILD_SRC),)
161 # We process the rest of the Makefile if this is the final invocation of make
162 ifeq ($(skip-makefile),)
164 # Do not print "Entering directory ...",
165 # but we want to display it when entering to the output directory
166 # so that IDEs/editors are able to understand relative filenames.
167 MAKEFLAGS += --no-print-directory
169 # Call a source code checker (by default, "sparse") as part of the
172 # Use 'make C=1' to enable checking of only re-compiled files.
173 # Use 'make C=2' to enable checking of *all* source files, regardless
174 # of whether they are re-compiled or not.
176 # See the file "Documentation/dev-tools/sparse.rst" for more details,
177 # including where to get the "sparse" utility.
179 ifeq ("$(origin C)", "command line")
180 KBUILD_CHECKSRC = $(C)
182 ifndef KBUILD_CHECKSRC
186 # Use make M=dir to specify directory of external module to build
187 # Old syntax make ... SUBDIRS=$PWD is still supported
188 # Setting the environment variable KBUILD_EXTMOD take precedence
190 KBUILD_EXTMOD ?= $(SUBDIRS)
193 ifeq ("$(origin M)", "command line")
194 KBUILD_EXTMOD := $(M)
197 ifeq ($(KBUILD_SRC),)
198 # building in the source tree
201 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
202 # building in a subdirectory of the source tree
205 srctree := $(KBUILD_SRC)
209 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
215 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
217 export srctree objtree VPATH
219 # To make sure we do not include .config for any of the *config targets
220 # catch them early, and hand them over to scripts/kconfig/Makefile
221 # It is allowed to specify more targets when calling make, including
222 # mixing *config targets and build targets.
223 # For example 'make oldconfig all'.
224 # Detect when mixed targets is specified, and make a second invocation
225 # of make so .config is not included in this case either (for *config).
227 version_h := include/generated/uapi/linux/version.h
228 old_version_h := include/linux/version.h
230 clean-targets := %clean mrproper cleandocs
231 no-dot-config-targets := $(clean-targets) \
232 cscope gtags TAGS tags help% %docs check% coccicheck \
233 $(version_h) headers_% archheaders archscripts \
234 %asm-generic kernelversion %src-pkg
235 no-sync-config-targets := $(no-dot-config-targets) install %install \
243 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
244 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
249 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
250 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
255 ifneq ($(KBUILD_EXTMOD),)
259 ifeq ($(KBUILD_EXTMOD),)
260 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
262 ifneq ($(words $(MAKECMDGOALS)),1)
268 # For "make -j clean all", "make -j mrproper defconfig all", etc.
269 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
270 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
275 # install and modules_install need also be processed one by one
276 ifneq ($(filter install,$(MAKECMDGOALS)),)
277 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
282 ifeq ($(mixed-targets),1)
283 # ===========================================================================
284 # We're called with mixed targets (*config and build targets).
285 # Handle them one by one.
287 PHONY += $(MAKECMDGOALS) __build_one_by_one
289 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
294 for i in $(MAKECMDGOALS); do \
295 $(MAKE) -f $(srctree)/Makefile $$i; \
300 # We need some generic definitions (do not try to remake the file).
301 scripts/Kbuild.include: ;
302 include scripts/Kbuild.include
304 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
305 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
306 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
307 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
309 include scripts/subarch.include
311 # Cross compiling and selecting different set of gcc/bin-utils
312 # ---------------------------------------------------------------------------
314 # When performing cross compilation for other architectures ARCH shall be set
315 # to the target architecture. (See arch/* for the possibilities).
316 # ARCH can be set during invocation of make:
318 # Another way is to have ARCH set in the environment.
319 # The default ARCH is the host where make is executed.
321 # CROSS_COMPILE specify the prefix used for all executables used
322 # during compilation. Only gcc and related bin-utils executables
323 # are prefixed with $(CROSS_COMPILE).
324 # CROSS_COMPILE can be set on the command line
325 # make CROSS_COMPILE=ia64-linux-
326 # Alternatively CROSS_COMPILE can be set in the environment.
327 # Default value for CROSS_COMPILE is not to prefix executables
328 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
331 # Architecture as present in compile.h
332 UTS_MACHINE := $(ARCH)
335 # Additional ARCH settings for x86
339 ifeq ($(ARCH),x86_64)
343 # Additional ARCH settings for sparc
344 ifeq ($(ARCH),sparc32)
347 ifeq ($(ARCH),sparc64)
351 # Additional ARCH settings for sh
356 KCONFIG_CONFIG ?= .config
357 export KCONFIG_CONFIG
359 # SHELL used by kbuild
360 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
361 else if [ -x /bin/bash ]; then echo /bin/bash; \
362 else echo sh; fi ; fi)
364 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
365 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
366 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
375 KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
376 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
378 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
379 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
380 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
382 # Make variables (CC, etc...)
389 OBJCOPY = llvm-objcopy
390 OBJDUMP = llvm-objdump
391 READELF = llvm-readelf
395 CC = $(CROSS_COMPILE)gcc
396 LD = $(CROSS_COMPILE)ld
397 AR = $(CROSS_COMPILE)ar
398 NM = $(CROSS_COMPILE)nm
399 OBJCOPY = $(CROSS_COMPILE)objcopy
400 OBJDUMP = $(CROSS_COMPILE)objdump
401 READELF = $(CROSS_COMPILE)readelf
402 OBJSIZE = $(CROSS_COMPILE)size
403 STRIP = $(CROSS_COMPILE)strip
408 GENKSYMS = scripts/genksyms/genksyms
409 INSTALLKERNEL := installkernel
417 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
418 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
427 # Use USERINCLUDE when you must reference the UAPI directories only.
429 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
430 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
431 -I$(srctree)/include/uapi \
432 -I$(objtree)/include/generated/uapi \
433 -include $(srctree)/include/linux/kconfig.h
435 # Use LINUXINCLUDE when you must reference the include/ directory.
436 # Needed to be compatible with the O= option
438 -I$(srctree)/arch/$(SRCARCH)/include \
439 -I$(objtree)/arch/$(SRCARCH)/include/generated \
440 $(if $(KBUILD_SRC), -I$(srctree)/include) \
441 -I$(objtree)/include \
444 KBUILD_AFLAGS := -D__ASSEMBLY__
445 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
446 -fno-strict-aliasing -fno-common -fshort-wchar \
447 -Werror-implicit-function-declaration \
448 -Werror=return-type -Wno-format-security \
450 KBUILD_CPPFLAGS := -D__KERNEL__
451 KBUILD_AFLAGS_KERNEL :=
452 KBUILD_CFLAGS_KERNEL :=
453 KBUILD_AFLAGS_MODULE := -DMODULE
454 KBUILD_CFLAGS_MODULE := -DMODULE
455 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
457 GCC_PLUGINS_CFLAGS :=
460 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
461 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
462 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
463 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
465 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
466 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
467 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
468 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
469 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
470 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
471 export KBUILD_ARFLAGS
473 # When compiling out-of-tree modules, put MODVERDIR in the module
474 # tree rather than in the kernel tree. The kernel tree might
476 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
478 # Files to ignore in find ... statements
480 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
481 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
483 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
484 --exclude CVS --exclude .pc --exclude .hg --exclude .git
486 # ===========================================================================
487 # Rules shared between *config targets and build targets
489 # Basic helpers built in scripts/basic/
490 PHONY += scripts_basic
492 $(Q)$(MAKE) $(build)=scripts/basic
493 $(Q)rm -f .tmp_quiet_recordmcount
495 # To avoid any implicit rule to kick in, define an empty command.
496 scripts/basic/%: scripts_basic ;
498 PHONY += outputmakefile
499 # outputmakefile generates a Makefile in the output directory, if using a
500 # separate output directory. This allows convenient use of make in the
503 ifneq ($(KBUILD_SRC),)
504 $(Q)ln -fsn $(srctree) source
505 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
506 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
509 ifeq ($(cc-name),clang)
510 ifneq ($(CROSS_COMPILE),)
511 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
512 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
513 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
514 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
516 ifneq ($(GCC_TOOLCHAIN),)
517 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
519 ifneq ($(LLVM_IAS),1)
520 CLANG_FLAGS += -no-integrated-as
522 CLANG_FLAGS += -Werror=unknown-warning-option
523 KBUILD_CFLAGS += $(CLANG_FLAGS)
524 KBUILD_AFLAGS += $(CLANG_FLAGS)
528 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
529 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
530 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
531 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
532 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
533 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
534 export RETPOLINE_CFLAGS
535 export RETPOLINE_VDSO_CFLAGS
537 KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
538 KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
540 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
541 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
542 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
543 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
544 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
546 ifeq ($(config-targets),1)
547 # ===========================================================================
548 # *config targets only - make sure prerequisites are updated, and descend
549 # in scripts/kconfig to make the *config target
551 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
552 # KBUILD_DEFCONFIG may point out an alternative default configuration
553 # used for 'make defconfig'
554 include arch/$(SRCARCH)/Makefile
555 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
557 config: scripts_basic outputmakefile FORCE
558 $(Q)$(MAKE) $(build)=scripts/kconfig $@
560 %config: scripts_basic outputmakefile FORCE
561 $(Q)$(MAKE) $(build)=scripts/kconfig $@
564 # ===========================================================================
565 # Build targets only - this includes vmlinux, arch specific targets, clean
566 # targets and others. In general all targets except *config targets.
568 # If building an external module we do not care about the all: rule
569 # but instead _all depend on modules
571 ifeq ($(KBUILD_EXTMOD),)
577 # Decide whether to build built-in, modular, or both.
578 # Normally, just do built-in.
583 # If we have only "make modules", don't compile built-in objects.
584 ifeq ($(MAKECMDGOALS),modules)
588 # If we have "make <whatever> modules", compile modules
589 # in addition to whatever we do anyway.
590 # Just "make" or "make all" shall build modules as well
592 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
596 ifeq ($(MAKECMDGOALS),)
600 export KBUILD_MODULES KBUILD_BUILTIN
602 ifeq ($(KBUILD_EXTMOD),)
603 # Objects we will link into vmlinux / subdirs we need to visit
605 drivers-y := drivers/ sound/ firmware/
610 endif # KBUILD_EXTMOD
612 ifeq ($(dot-config),1)
613 include include/config/auto.conf
616 # The all: target is the default when no target is given on the
618 # This allow a user to issue only 'make' to build a kernel including modules
619 # Defaults to vmlinux, but the arch makefile usually adds further targets
622 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
623 $(call cc-option,-fno-tree-loop-im) \
624 $(call cc-disable-warning,maybe-uninitialized,)
627 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
628 ifdef CONFIG_FUNCTION_TRACER
629 CC_FLAGS_FTRACE := -pg
632 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
633 # values of the respective KBUILD_* variables
637 include arch/$(SRCARCH)/Makefile
639 ifeq ($(dot-config),1)
640 ifeq ($(may-sync-config),1)
641 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
642 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
643 # because some architectures define CROSS_COMPILE there.
644 include include/config/auto.conf.cmd
646 # To avoid any implicit rule to kick in, define an empty command
649 # The actual configuration files used during the build are stored in
650 # include/generated/ and include/config/. Update them if .config is newer than
651 # include/config/auto.conf (which mirrors .config).
653 # This exploits the 'multi-target pattern rule' trick.
654 # The syncconfig should be executed only once to make all the targets.
655 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
656 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
658 # External modules and some install targets need include/generated/autoconf.h
659 # and include/config/auto.conf but do not care if they are up-to-date.
660 # Use auto.conf to trigger the test
661 PHONY += include/config/auto.conf
663 include/config/auto.conf:
664 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
666 echo >&2 " ERROR: Kernel configuration is invalid."; \
667 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
668 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
672 endif # may-sync-config
673 endif # $(dot-config)
675 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
676 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
677 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
678 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
679 KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
680 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
682 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
688 # Tell gcc to never replace conditional load with a non-conditional one
689 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
690 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
692 include scripts/Makefile.kcov
693 include scripts/Makefile.gcc-plugins
695 ifdef CONFIG_READABLE_ASM
696 # Disable optimizations that make assembler listings hard to read.
697 # reorder blocks reorders the control in the function
698 # ipa clone creates specialized cloned functions
699 # partial inlining inlines only parts of functions
700 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
701 $(call cc-option,-fno-ipa-cp-clone,) \
702 $(call cc-option,-fno-partial-inlining)
705 ifneq ($(CONFIG_FRAME_WARN),0)
706 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
709 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
710 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
711 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
713 KBUILD_CFLAGS += $(stackp-flags-y)
715 ifeq ($(cc-name),clang)
716 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
717 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
718 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
719 # Quiet clang warning: comparison of unsigned expression < 0 is always false
720 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
721 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
722 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
723 # See modpost pattern 2
724 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
725 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
728 # These warnings generated too much noise in a regular build.
729 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
730 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
732 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
733 ifdef CONFIG_FRAME_POINTER
734 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
736 # Some targets (ARM with Thumb2, for example), can't be built with frame
737 # pointers. For those, we don't have FUNCTION_TRACER automatically
738 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
739 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
740 # -fomit-frame-pointer with FUNCTION_TRACER.
741 ifndef CONFIG_FUNCTION_TRACER
742 KBUILD_CFLAGS += -fomit-frame-pointer
746 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
748 ifdef CONFIG_DEBUG_INFO
749 ifdef CONFIG_DEBUG_INFO_SPLIT
750 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
757 KBUILD_AFLAGS += -Wa,-gdwarf-2
761 ifdef CONFIG_DEBUG_INFO_DWARF4
762 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
765 ifdef CONFIG_DEBUG_INFO_REDUCED
766 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
767 $(call cc-option,-fno-var-tracking)
770 ifdef CONFIG_FUNCTION_TRACER
771 ifdef CONFIG_FTRACE_MCOUNT_RECORD
772 # gcc 5 supports generating the mcount tables directly
773 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
774 CC_FLAGS_FTRACE += -mrecord-mcount
775 export CC_USING_RECORD_MCOUNT := 1
777 ifdef CONFIG_HAVE_NOP_MCOUNT
778 ifeq ($(call cc-option-yn, -mnop-mcount),y)
779 CC_FLAGS_FTRACE += -mnop-mcount
780 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
784 ifdef CONFIG_HAVE_FENTRY
785 ifeq ($(call cc-option-yn, -mfentry),y)
786 CC_FLAGS_FTRACE += -mfentry
787 CC_FLAGS_USING += -DCC_USING_FENTRY
790 export CC_FLAGS_FTRACE
791 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
792 KBUILD_AFLAGS += $(CC_FLAGS_USING)
793 ifdef CONFIG_DYNAMIC_FTRACE
794 ifdef CONFIG_HAVE_C_RECORDMCOUNT
795 BUILD_C_RECORDMCOUNT := y
796 export BUILD_C_RECORDMCOUNT
801 # We trigger additional mismatches with less inlining
802 ifdef CONFIG_DEBUG_SECTION_MISMATCH
803 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
806 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
807 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
808 LDFLAGS_vmlinux += --gc-sections
811 # arch Makefile may override CC so keep this after arch Makefile is included
812 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
814 # warn about C99 declaration after statement
815 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
817 # disable pointer signed / unsigned warnings in gcc 4.0
818 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
820 # disable stringop warnings in gcc 8+
821 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
823 # We'll want to enable this eventually, but it's not going away for 5.7 at least
824 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
825 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
826 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
828 # Another good warning that we'll want to enable eventually
829 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
831 # Enabled with W=2, disabled by default as noisy
832 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
834 # disable invalid "can't wrap" optimizations for signed / pointers
835 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
837 # clang sets -fmerge-all-constants by default as optimization, but this
838 # is non-conforming behavior for C and in fact breaks the kernel, so we
839 # need to disable it here generally.
840 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
842 # for gcc -fno-merge-all-constants disables everything, but it is fine
843 # to have actual conforming behavior enabled.
844 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
846 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
847 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
849 # conserve stack if available
850 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
852 # disallow errors like 'EXPORT_GPL(foo);' with missing header
853 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
855 # require functions to have arguments in prototypes, not empty 'int foo()'
856 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
858 # Prohibit date/time macros, which would make the build non-deterministic
859 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
861 # enforce correct pointer usage
862 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
864 # Require designated initializers for all marked structures
865 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
867 # change __FILE__ to the relative path from the srctree
868 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
870 # use the deterministic mode of AR if available
871 KBUILD_ARFLAGS := $(call ar-option,D)
873 include scripts/Makefile.kasan
874 include scripts/Makefile.extrawarn
875 include scripts/Makefile.ubsan
877 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
879 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
880 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
881 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
883 # Use --build-id when available.
884 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
885 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
886 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
888 KBUILD_LDFLAGS += -z noexecstack
889 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
891 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
892 LDFLAGS_vmlinux += $(call ld-option, -X,)
895 # insure the checker run with the right endianness
896 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
898 # the checker needs the correct machine size
899 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
901 # Default kernel image to build when no specific target is given.
902 # KBUILD_IMAGE may be overruled on the command line or
903 # set in the environment
904 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
906 export KBUILD_IMAGE ?= vmlinux
909 # INSTALL_PATH specifies where to place the updated kernel and system map
910 # images. Default is /boot, but you can set it to other values
911 export INSTALL_PATH ?= /boot
914 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
915 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
916 # an argument if needed. Otherwise it defaults to the kernel install path
918 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
921 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
922 # relocations required by build roots. This is not defined in the
923 # makefile but the argument can be passed to make if needed.
926 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
930 # INSTALL_MOD_STRIP, if defined, will cause modules to be
931 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
932 # the default option --strip-debug will be used. Otherwise,
933 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
935 ifdef INSTALL_MOD_STRIP
936 ifeq ($(INSTALL_MOD_STRIP),1)
937 mod_strip_cmd = $(STRIP) --strip-debug
939 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
940 endif # INSTALL_MOD_STRIP=1
943 endif # INSTALL_MOD_STRIP
946 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
947 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
948 # or CONFIG_MODULE_COMPRESS_XZ.
950 mod_compress_cmd = true
951 ifdef CONFIG_MODULE_COMPRESS
952 ifdef CONFIG_MODULE_COMPRESS_GZIP
953 mod_compress_cmd = gzip -n -f
954 endif # CONFIG_MODULE_COMPRESS_GZIP
955 ifdef CONFIG_MODULE_COMPRESS_XZ
956 mod_compress_cmd = xz -f
957 endif # CONFIG_MODULE_COMPRESS_XZ
958 endif # CONFIG_MODULE_COMPRESS
959 export mod_compress_cmd
961 # Select initial ramdisk compression format, default is gzip(1).
962 # This shall be used by the dracut(8) tool while creating an initramfs image.
964 INITRD_COMPRESS-y := gzip
965 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
966 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
967 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
968 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
969 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
970 # do not export INITRD_COMPRESS, since we didn't actually
971 # choose a sane default compression above.
972 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
974 ifdef CONFIG_MODULE_SIG_ALL
975 $(eval $(call config_filename,MODULE_SIG_KEY))
977 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
983 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
985 ifdef CONFIG_STACK_VALIDATION
986 has_libelf := $(call try-run,\
987 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
988 ifeq ($(has_libelf),1)
989 objtool_target := tools/objtool FORCE
991 SKIP_STACK_VALIDATION := 1
992 export SKIP_STACK_VALIDATION
998 ifeq ($(KBUILD_EXTMOD),)
999 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1001 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1002 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1003 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1005 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
1006 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1008 init-y := $(patsubst %/, %/built-in.a, $(init-y))
1009 core-y := $(patsubst %/, %/built-in.a, $(core-y))
1010 drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1011 net-y := $(patsubst %/, %/built-in.a, $(net-y))
1012 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1013 libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1014 virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1016 # Externally visible symbols (used by link-vmlinux.sh)
1017 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1018 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1019 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1020 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1021 export LDFLAGS_vmlinux
1022 # used by scripts/package/Makefile
1023 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1025 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1027 # Recurse until adjust_autoksyms.sh is satisfied
1028 PHONY += autoksyms_recursive
1029 autoksyms_recursive: $(vmlinux-deps)
1030 ifdef CONFIG_TRIM_UNUSED_KSYMS
1031 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1032 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1035 # For the kernel to actually contain only the needed exported symbols,
1036 # we have to build modules as well to determine what those symbols are.
1037 # (this can be evaluated only once include/config/auto.conf has been included)
1038 ifdef CONFIG_TRIM_UNUSED_KSYMS
1042 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1045 $(Q)mkdir -p $(dir $@)
1048 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1050 # Final link of vmlinux with optional arch pass after final link
1051 cmd_link-vmlinux = \
1052 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
1053 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1055 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1056 ifdef CONFIG_HEADERS_CHECK
1057 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1059 ifdef CONFIG_GDB_SCRIPTS
1060 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1062 +$(call if_changed,link-vmlinux)
1064 # Build samples along the rest of the kernel. This needs headers_install.
1065 ifdef CONFIG_SAMPLES
1066 vmlinux-dirs += samples
1067 samples: headers_install
1070 # The actual objects are generated when descending,
1071 # make sure no implicit rule kicks in
1072 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1074 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1075 # Preset locale variables to speed up the build process. Limit locale
1076 # tweaks to this spot to avoid wrong language settings when running
1077 # make menuconfig etc.
1078 # Error messages still appears in the original language
1080 PHONY += $(vmlinux-dirs)
1081 $(vmlinux-dirs): prepare scripts
1082 $(Q)$(MAKE) $(build)=$@ need-builtin=1
1084 define filechk_kernel.release
1085 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1088 # Store (new) KERNELRELEASE string in include/config/kernel.release
1089 include/config/kernel.release: $(srctree)/Makefile FORCE
1090 $(call filechk,kernel.release)
1092 # Additional helpers built in scripts/
1093 # Carefully list dependencies so we do not try to build scripts twice
1096 scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h)
1097 $(Q)$(MAKE) $(build)=$(@)
1099 # Things we need to do before we recursively start building the kernel
1100 # or the modules are listed in "prepare".
1101 # A multi level approach is used. prepareN is processed before prepareN-1.
1102 # archprepare is used in arch Makefiles and when processed asm symlink,
1103 # version.h and scripts_basic is processed / created.
1105 PHONY += prepare archprepare prepare1 prepare2 prepare3
1107 # prepare3 is used to check if we are building in a separate output directory,
1109 # 1) Check that make has not been executed in the kernel src $(srctree)
1110 prepare3: include/config/kernel.release
1111 ifneq ($(KBUILD_SRC),)
1112 @$(kecho) ' Using $(srctree) as source for kernel'
1113 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1114 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1115 echo >&2 " in the '$(srctree)' directory.";\
1120 # prepare2 creates a makefile if using a separate output directory.
1121 # From this point forward, .config has been reprocessed, so any rules
1122 # that need to depend on updated CONFIG_* values can be checked here.
1123 prepare2: prepare3 outputmakefile asm-generic
1125 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1128 archprepare: archheaders archscripts prepare1 scripts_basic
1130 prepare0: archprepare gcc-plugins
1131 $(Q)$(MAKE) $(build)=.
1133 # All the preparing..
1134 prepare: prepare0 prepare-objtool
1136 # Support for using generic headers in asm-generic
1137 PHONY += asm-generic uapi-asm-generic
1138 asm-generic: uapi-asm-generic
1139 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1140 src=asm obj=arch/$(SRCARCH)/include/generated/asm
1142 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1143 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1145 PHONY += prepare-objtool
1146 prepare-objtool: $(objtool_target)
1147 ifeq ($(SKIP_STACK_VALIDATION),1)
1148 ifdef CONFIG_UNWINDER_ORC
1149 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1152 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1156 # Generate some files
1157 # ---------------------------------------------------------------------------
1159 # KERNELRELEASE can change from a few different places, meaning version.h
1160 # needs to be updated, so this check is forced on all builds
1163 define filechk_utsrelease.h
1164 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1165 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1168 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1171 define filechk_version.h
1172 (echo \#define LINUX_VERSION_CODE $(shell \
1173 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255); \
1174 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1178 $(call filechk,version.h)
1179 $(Q)rm -f $(old_version_h)
1181 include/generated/utsrelease.h: include/config/kernel.release FORCE
1182 $(call filechk,utsrelease.h)
1186 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1187 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1189 # ---------------------------------------------------------------------------
1192 #Default location for installed headers
1193 export INSTALL_HDR_PATH = $(objtree)/usr
1195 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1196 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1198 PHONY += archheaders
1201 PHONY += archscripts
1205 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1206 $(Q)$(MAKE) $(build)=scripts build_unifdef
1208 PHONY += headers_install_all
1209 headers_install_all:
1210 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1212 PHONY += headers_install
1213 headers_install: __headers
1214 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1215 $(error Headers not exportable for the $(SRCARCH) architecture))
1216 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1217 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1219 PHONY += headers_check_all
1220 headers_check_all: headers_install_all
1221 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1223 PHONY += headers_check
1224 headers_check: headers_install
1225 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1226 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1228 # ---------------------------------------------------------------------------
1233 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1235 PHONY += kselftest-clean
1237 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1239 PHONY += kselftest-merge
1241 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1242 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1243 -m $(objtree)/.config \
1244 $(srctree)/tools/testing/selftests/*/config
1245 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1247 # ---------------------------------------------------------------------------
1250 ifdef CONFIG_MODULES
1252 # By default, build modules as well
1256 # When we're building modules with modversions, we need to consider
1257 # the built-in objects during the descend as well, in order to
1258 # make sure the checksums are up to date before we record them.
1259 ifdef CONFIG_MODVERSIONS
1265 # A module can be listed more than once in obj-m resulting in
1266 # duplicate lines in modules.order files. Those are removed
1267 # using awk while concatenating to the final file.
1270 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1271 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1272 @$(kecho) ' Building modules, stage 2.';
1273 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1275 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1276 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1278 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1279 $(Q)$(MAKE) $(modbuiltin)=$*
1282 # Target to prepare building external modules
1283 PHONY += modules_prepare
1284 modules_prepare: prepare scripts
1286 # Target to install modules
1287 PHONY += modules_install
1288 modules_install: _modinst_ _modinst_post
1292 @rm -rf $(MODLIB)/kernel
1293 @rm -f $(MODLIB)/source
1294 @mkdir -p $(MODLIB)/kernel
1295 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1296 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1297 rm -f $(MODLIB)/build ; \
1298 ln -s $(CURDIR) $(MODLIB)/build ; \
1300 @cp -f $(objtree)/modules.order $(MODLIB)/
1301 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1302 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1304 # This depmod is only for convenience to give the initial
1305 # boot a modules.dep even before / is mounted read-write. However the
1306 # boot script depmod is the master version.
1307 PHONY += _modinst_post
1308 _modinst_post: _modinst_
1311 ifeq ($(CONFIG_MODULE_SIG), y)
1312 PHONY += modules_sign
1314 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1317 else # CONFIG_MODULES
1319 # Modules not configured
1320 # ---------------------------------------------------------------------------
1322 PHONY += modules modules_install
1323 modules modules_install:
1325 @echo >&2 "The present kernel configuration has modules disabled."
1326 @echo >&2 "Type 'make config' and enable loadable module support."
1327 @echo >&2 "Then build a kernel with module support enabled."
1331 endif # CONFIG_MODULES
1334 # Cleaning is done on three levels.
1335 # make clean Delete most generated files
1336 # Leave enough to build external modules
1337 # make mrproper Delete the current configuration, and all generated files
1338 # make distclean Remove editor backup files, patch leftover files and the like
1340 # Directories & files removed with 'make clean'
1341 CLEAN_DIRS += $(MODVERDIR) include/ksym
1343 # Directories & files removed with 'make mrproper'
1344 MRPROPER_DIRS += include/config usr/include include/generated \
1345 arch/*/include/generated .tmp_objdiff
1346 MRPROPER_FILES += .config .config.old .version \
1347 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1348 signing_key.pem signing_key.priv signing_key.x509 \
1349 x509.genkey extra_certificates signing_key.x509.keyid \
1350 signing_key.x509.signer vmlinux-gdb.py
1352 # clean - Delete most, but leave enough to build external modules
1354 clean: rm-dirs := $(CLEAN_DIRS)
1355 clean: rm-files := $(CLEAN_FILES)
1356 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1358 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1360 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1363 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1364 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1366 clean: archclean vmlinuxclean
1368 # mrproper - Delete all generated files, including .config
1370 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1371 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1372 mrproper-dirs := $(addprefix _mrproper_,scripts)
1374 PHONY += $(mrproper-dirs) mrproper archmrproper
1376 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1378 mrproper: clean archmrproper $(mrproper-dirs)
1387 @find $(srctree) $(RCS_FIND_IGNORE) \
1388 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1389 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1390 -o -name 'core' \) \
1391 -type f -print | xargs rm -f
1394 # Packaging of the kernel to various formats
1395 # ---------------------------------------------------------------------------
1396 package-dir := scripts/package
1399 $(Q)$(MAKE) $(build)=$(package-dir) $@
1400 %pkg: include/config/kernel.release FORCE
1401 $(Q)$(MAKE) $(build)=$(package-dir) $@
1404 # Brief documentation of the typical targets used
1405 # ---------------------------------------------------------------------------
1407 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1408 boards := $(sort $(notdir $(boards)))
1409 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1410 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1414 @echo 'Cleaning targets:'
1415 @echo ' clean - Remove most generated files but keep the config and'
1416 @echo ' enough build support to build external modules'
1417 @echo ' mrproper - Remove all generated files + config + various backup files'
1418 @echo ' distclean - mrproper + remove editor backup and patch files'
1420 @echo 'Configuration targets:'
1421 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1423 @echo 'Other generic targets:'
1424 @echo ' all - Build all targets marked with [*]'
1425 @echo '* vmlinux - Build the bare kernel'
1426 @echo '* modules - Build all modules'
1427 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1428 @echo ' dir/ - Build all files in dir and below'
1429 @echo ' dir/file.[ois] - Build specified target only'
1430 @echo ' dir/file.ll - Build the LLVM assembly file'
1431 @echo ' (requires compiler support for LLVM assembly generation)'
1432 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1433 @echo ' (requires a recent binutils and recent build (System.map))'
1434 @echo ' dir/file.ko - Build module including final link'
1435 @echo ' modules_prepare - Set up for building external modules'
1436 @echo ' tags/TAGS - Generate tags file for editors'
1437 @echo ' cscope - Generate cscope index'
1438 @echo ' gtags - Generate GNU GLOBAL index'
1439 @echo ' kernelrelease - Output the release version string (use with make -s)'
1440 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1441 @echo ' image_name - Output the image name (use with make -s)'
1442 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1443 echo ' (default: $(INSTALL_HDR_PATH))'; \
1445 @echo 'Static analysers:'
1446 @echo ' checkstack - Generate a list of stack hogs'
1447 @echo ' namespacecheck - Name space analysis on compiled kernel'
1448 @echo ' versioncheck - Sanity check on version.h usage'
1449 @echo ' includecheck - Check for duplicate included header files'
1450 @echo ' export_report - List the usages of all exported symbols'
1451 @echo ' headers_check - Sanity check on exported headers'
1452 @echo ' headerdep - Detect inclusion cycles in headers'
1453 @echo ' coccicheck - Check with Coccinelle'
1455 @echo 'Kernel selftest:'
1456 @echo ' kselftest - Build and run kernel selftest (run as root)'
1457 @echo ' Build, install, and boot kernel before'
1458 @echo ' running kselftest on it'
1459 @echo ' kselftest-clean - Remove all generated kselftest files'
1460 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1463 @echo 'Userspace tools targets:'
1464 @echo ' use "make tools/help"'
1465 @echo ' or "cd tools; make help"'
1467 @echo 'Kernel packaging:'
1468 @$(MAKE) $(build)=$(package-dir) help
1470 @echo 'Documentation targets:'
1471 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1473 @echo 'Architecture specific targets ($(SRCARCH)):'
1474 @$(if $(archhelp),$(archhelp),\
1475 echo ' No architecture specific help defined for $(SRCARCH)')
1478 $(foreach b, $(boards), \
1479 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1481 @$(if $(board-dirs), \
1482 $(foreach b, $(board-dirs), \
1483 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1484 printf " %-16s - Show all of the above\\n" help-boards; \
1487 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1488 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1489 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1490 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1491 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1492 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1493 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1494 @echo ' 1: warnings which may be relevant and do not occur too often'
1495 @echo ' 2: warnings which occur quite often but may still be relevant'
1496 @echo ' 3: more obscure warnings, can most likely be ignored'
1497 @echo ' Multiple levels can be combined with W=12 or W=123'
1499 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1500 @echo 'For further info see the ./README file'
1503 help-board-dirs := $(addprefix help-,$(board-dirs))
1505 help-boards: $(help-board-dirs)
1507 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1509 $(help-board-dirs): help-%:
1510 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1511 @$(if $(boards-per-dir), \
1512 $(foreach b, $(boards-per-dir), \
1513 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1517 # Documentation targets
1518 # ---------------------------------------------------------------------------
1519 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1520 linkcheckdocs dochelp refcheckdocs
1521 PHONY += $(DOC_TARGETS)
1522 $(DOC_TARGETS): scripts_basic FORCE
1523 $(Q)$(MAKE) $(build)=Documentation $@
1525 else # KBUILD_EXTMOD
1528 # External module support.
1529 # When building external modules the kernel used as basis is considered
1530 # read-only, and no consistency checks are made and the make
1531 # system is not used on the basis kernel. If updates are required
1532 # in the basis kernel ordinary make commands (without M=...) must
1535 # The following are the only valid targets when building external
1537 # make M=dir clean Delete all automatically generated files
1538 # make M=dir modules Make all modules in specified dir
1539 # make M=dir Same as 'make M=dir modules'
1540 # make M=dir modules_install
1541 # Install the modules built in the module directory
1542 # Assumes install directory is already created
1544 # We are always building modules
1547 PHONY += $(objtree)/Module.symvers
1548 $(objtree)/Module.symvers:
1549 @test -e $(objtree)/Module.symvers || ( \
1551 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1552 echo " is missing; modules will have no dependencies and modversions."; \
1555 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1556 PHONY += $(module-dirs) modules
1557 $(module-dirs): prepare $(objtree)/Module.symvers
1558 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1560 modules: $(module-dirs)
1561 @$(kecho) ' Building modules, stage 2.';
1562 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1564 PHONY += modules_install
1565 modules_install: _emodinst_ _emodinst_post
1567 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1570 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1571 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1573 PHONY += _emodinst_post
1574 _emodinst_post: _emodinst_
1577 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1579 PHONY += $(clean-dirs) clean
1581 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1583 clean: rm-dirs := $(MODVERDIR)
1584 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1588 @echo ' Building external modules.'
1589 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1591 @echo ' modules - default target, build the module(s)'
1592 @echo ' modules_install - install the module'
1593 @echo ' clean - remove generated files in module directory only'
1597 PHONY += prepare scripts
1601 endif # KBUILD_EXTMOD
1603 clean: $(clean-dirs)
1606 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1607 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1608 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1609 -o -name '*.dwo' -o -name '*.lst' \
1611 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1612 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1613 -o -name '*.asn1.[ch]' \
1614 -o -name '*.symtypes' -o -name 'modules.order' \
1615 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1616 -o -name '*.c.[012]*.*' \
1618 -o -name '*.gcno' \) -type f -print | xargs rm -f
1620 # Generate tags for editors
1621 # ---------------------------------------------------------------------------
1622 quiet_cmd_tags = GEN $@
1623 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1625 tags TAGS cscope gtags: FORCE
1628 # Scripts to check various things for consistency
1629 # ---------------------------------------------------------------------------
1631 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1634 find $(srctree)/* $(RCS_FIND_IGNORE) \
1635 -name '*.[hcS]' -type f -print | sort \
1636 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1639 find $(srctree)/* $(RCS_FIND_IGNORE) \
1640 -name '*.[hcS]' -type f -print | sort \
1641 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1644 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1647 $(PERL) $(srctree)/scripts/namespace.pl
1650 $(PERL) $(srctree)/scripts/export_report.pl
1652 endif #ifeq ($(config-targets),1)
1653 endif #ifeq ($(mixed-targets),1)
1655 PHONY += checkstack kernelrelease kernelversion image_name
1657 # UML needs a little special treatment here. It wants to use the host
1658 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1659 # else wants $(ARCH), including people doing cross-builds, which means
1660 # that $(SUBARCH) doesn't work here.
1662 CHECKSTACK_ARCH := $(SUBARCH)
1664 CHECKSTACK_ARCH := $(ARCH)
1667 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1668 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1671 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1674 @echo $(KERNELVERSION)
1677 @echo $(KBUILD_IMAGE)
1679 # Clear a bunch of variables before executing the submake
1681 $(Q)mkdir -p $(objtree)/tools
1682 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1685 $(Q)mkdir -p $(objtree)/tools
1686 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1689 # ---------------------------------------------------------------------------
1690 # Single targets are compatible with:
1691 # - build with mixed source and output
1692 # - build with separate output dir 'make O=...'
1693 # - external modules
1695 # target-dir => where to store outputfile
1696 # build-dir => directory in kernel source tree to use
1698 ifeq ($(KBUILD_EXTMOD),)
1699 build-dir = $(patsubst %/,%,$(dir $@))
1700 target-dir = $(dir $@)
1702 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1703 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1704 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1707 %.s: %.c prepare scripts FORCE
1708 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1709 %.i: %.c prepare scripts FORCE
1710 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1711 %.o: %.c prepare scripts FORCE
1712 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1713 %.lst: %.c prepare scripts FORCE
1714 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1715 %.s: %.S prepare scripts FORCE
1716 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1717 %.o: %.S prepare scripts FORCE
1718 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1719 %.symtypes: %.c prepare scripts FORCE
1720 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1721 %.ll: %.c prepare scripts FORCE
1722 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1725 /: prepare scripts FORCE
1726 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1727 $(build)=$(build-dir)
1728 # Make sure the latest headers are built for Documentation
1729 Documentation/ samples/: headers_install
1730 %/: prepare scripts FORCE
1731 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1732 $(build)=$(build-dir)
1733 %.ko: prepare scripts FORCE
1734 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1735 $(build)=$(build-dir) $(@:.ko=.o)
1736 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1738 # FIXME Should go into a make.lib or something
1739 # ===========================================================================
1741 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1742 cmd_rmdirs = rm -rf $(rm-dirs)
1744 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1745 cmd_rmfiles = rm -f $(rm-files)
1747 # Run depmod only if we have System.map and depmod is executable
1748 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1749 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1752 # Create temporary dir for module support files
1753 # clean it up only when building all modules
1754 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1755 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1757 # read all saved command lines
1759 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1761 ifneq ($(cmd_files),)
1762 $(cmd_files): ; # Do not try to update included dependency files
1763 include $(cmd_files)
1766 endif # skip-makefile
1771 # Declare the contents of the PHONY variable as phony. We keep that
1772 # information in a variable so we can use it in if_changed and friends.