1 # SPDX-License-Identifier: GPL-2.0
6 NAME = Hurr durr I'ma ninja sloth
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 ifeq ($(filter undefine,$(.FEATURES)),)
15 $(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
18 $(if $(filter __%, $(MAKECMDGOALS)), \
19 $(error targets prefixed with '__' are only for internal use))
21 # That's our default target when none is given on the command line
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 this-makefile := $(lastword $(MAKEFILE_LIST))
42 export abs_srctree := $(realpath $(dir $(this-makefile)))
43 export abs_objtree := $(CURDIR)
45 ifneq ($(sub_make_done),1)
47 # Do not use make's built-in rules and variables
48 # (this increases performance and avoids hard-to-debug behaviour)
51 # Avoid funny character set dependencies
55 export LC_COLLATE LC_NUMERIC
57 # Avoid interference with shell env settings
61 # ---------------------------------------------------------------------------
63 # Most of build commands in Kbuild start with "cmd_". You can optionally define
64 # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
65 # that command is printed by default.
68 # quiet_cmd_depmod = DEPMOD $(MODLIB)
69 # cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
71 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-verbose mode.
74 # $(Q)$(MAKE) $(build)=scripts/basic
76 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
79 # To put more focus on warnings, be less verbose as default
80 # Use 'make V=1' to see the full commands
82 ifeq ("$(origin V)", "command line")
89 ifneq ($(findstring 1, $(KBUILD_VERBOSE)),)
94 # If the user is running make -s (silent mode), suppress echoing of
96 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
98 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
99 short-opts := $(firstword -$(MAKEFLAGS))
101 short-opts := $(filter-out --%,$(MAKEFLAGS))
104 ifneq ($(findstring s,$(short-opts)),)
106 override KBUILD_VERBOSE :=
109 export quiet Q KBUILD_VERBOSE
111 # Call a source code checker (by default, "sparse") as part of the
114 # Use 'make C=1' to enable checking of only re-compiled files.
115 # Use 'make C=2' to enable checking of *all* source files, regardless
116 # of whether they are re-compiled or not.
118 # See the file "Documentation/dev-tools/sparse.rst" for more details,
119 # including where to get the "sparse" utility.
121 ifeq ("$(origin C)", "command line")
122 KBUILD_CHECKSRC = $(C)
124 ifndef KBUILD_CHECKSRC
128 export KBUILD_CHECKSRC
130 # Enable "clippy" (a linter) as part of the Rust compilation.
132 # Use 'make CLIPPY=1' to enable it.
133 ifeq ("$(origin CLIPPY)", "command line")
134 KBUILD_CLIPPY := $(CLIPPY)
139 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
140 # directory of external module to build. Setting M= takes precedence.
141 ifeq ("$(origin M)", "command line")
142 KBUILD_EXTMOD := $(M)
145 $(if $(word 2, $(KBUILD_EXTMOD)), \
146 $(error building multiple external modules is not supported))
148 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
149 $(error module directory path cannot contain '$x')))
151 # Remove trailing slashes
152 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
153 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
158 # backward compatibility
159 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
161 ifeq ("$(origin W)", "command line")
162 KBUILD_EXTRA_WARN := $(W)
165 export KBUILD_EXTRA_WARN
167 # Kbuild will save output files in the current working directory.
168 # This does not need to match to the root of the kernel source tree.
170 # For example, you can do this:
172 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
174 # If you want to save output files in a different location, there are
175 # two syntaxes to specify it.
178 # Use "make O=dir/to/store/output/files/"
180 # 2) Set KBUILD_OUTPUT
181 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
182 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
184 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
187 # Do we want to change the working directory?
188 ifeq ("$(origin O)", "command line")
189 KBUILD_OUTPUT := $(O)
192 ifneq ($(KBUILD_OUTPUT),)
193 # $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
194 $(shell mkdir -p "$(KBUILD_OUTPUT)")
195 # $(realpath ...) resolves symlinks
196 abs_objtree := $(realpath $(KBUILD_OUTPUT))
197 $(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)"))
198 endif # ifneq ($(KBUILD_OUTPUT),)
200 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
201 $(error source directory cannot contain spaces or colons)
204 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
205 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
206 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
208 # Cancel implicit rules for this Makefile.
212 export sub_make_done := 1
214 endif # sub_make_done
216 ifeq ($(abs_objtree),$(CURDIR))
217 # Suppress "Entering directory ..." if we are at the final work directory.
218 no-print-directory := --no-print-directory
220 # Recursion to show "Entering directory ..."
224 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
225 # If --no-print-directory is unset, recurse once again to set it.
226 # You may end up recursing into __sub-make twice. This is needed due to the
227 # behavior change in GNU Make 4.4.1.
231 ifeq ($(need-sub-make),1)
233 PHONY += $(MAKECMDGOALS) __sub-make
235 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
238 # Invoke a second make in the output directory, passing relevant variables
240 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
241 -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
245 # We process the rest of the Makefile if this is the final invocation of make
247 ifeq ($(abs_srctree),$(abs_objtree))
248 # building in the source tree
250 building_out_of_srctree :=
252 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
253 # building in a subdirectory of the source tree
256 srctree := $(abs_srctree)
258 building_out_of_srctree := 1
261 ifneq ($(KBUILD_ABS_SRCTREE),)
262 srctree := $(abs_srctree)
268 export building_out_of_srctree srctree objtree VPATH
270 # To make sure we do not include .config for any of the *config targets
271 # catch them early, and hand them over to scripts/kconfig/Makefile
272 # It is allowed to specify more targets when calling make, including
273 # mixing *config targets and build targets.
274 # For example 'make oldconfig all'.
275 # Detect when mixed targets is specified, and make a second invocation
276 # of make so .config is not included in this case either (for *config).
278 version_h := include/generated/uapi/linux/version.h
280 clean-targets := %clean mrproper cleandocs
281 no-dot-config-targets := $(clean-targets) \
282 cscope gtags TAGS tags help% %docs check% coccicheck \
283 $(version_h) headers headers_% archheaders archscripts \
284 %asm-generic kernelversion %src-pkg dt_binding_check \
285 outputmakefile rustavailable rustfmt rustfmtcheck
286 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
288 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
296 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
297 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
302 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
303 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
308 need-compiler := $(may-sync-config)
310 ifneq ($(KBUILD_EXTMOD),)
314 ifeq ($(KBUILD_EXTMOD),)
315 ifneq ($(filter %config,$(MAKECMDGOALS)),)
317 ifneq ($(words $(MAKECMDGOALS)),1)
323 # We cannot build single targets and the others at the same time
324 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
326 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
331 # For "make -j clean all", "make -j mrproper defconfig all", etc.
332 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
333 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
338 # install and modules_install need also be processed one by one
339 ifneq ($(filter install,$(MAKECMDGOALS)),)
340 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
346 # ===========================================================================
347 # We're called with mixed targets (*config and build targets).
348 # Handle them one by one.
350 PHONY += $(MAKECMDGOALS) __build_one_by_one
352 $(MAKECMDGOALS): __build_one_by_one
357 for i in $(MAKECMDGOALS); do \
358 $(MAKE) -f $(srctree)/Makefile $$i; \
363 include $(srctree)/scripts/Kbuild.include
365 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
366 KERNELRELEASE = $(call read-file, include/config/kernel.release)
367 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
368 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
370 include $(srctree)/scripts/subarch.include
372 # Cross compiling and selecting different set of gcc/bin-utils
373 # ---------------------------------------------------------------------------
375 # When performing cross compilation for other architectures ARCH shall be set
376 # to the target architecture. (See arch/* for the possibilities).
377 # ARCH can be set during invocation of make:
379 # Another way is to have ARCH set in the environment.
380 # The default ARCH is the host where make is executed.
382 # CROSS_COMPILE specify the prefix used for all executables used
383 # during compilation. Only gcc and related bin-utils executables
384 # are prefixed with $(CROSS_COMPILE).
385 # CROSS_COMPILE can be set on the command line
386 # make CROSS_COMPILE=aarch64-linux-gnu-
387 # Alternatively CROSS_COMPILE can be set in the environment.
388 # Default value for CROSS_COMPILE is not to prefix executables
389 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
392 # Architecture as present in compile.h
393 UTS_MACHINE := $(ARCH)
396 # Additional ARCH settings for x86
400 ifeq ($(ARCH),x86_64)
404 # Additional ARCH settings for sparc
405 ifeq ($(ARCH),sparc32)
408 ifeq ($(ARCH),sparc64)
412 # Additional ARCH settings for parisc
413 ifeq ($(ARCH),parisc64)
417 export cross_compiling :=
418 ifneq ($(SRCARCH),$(SUBARCH))
422 KCONFIG_CONFIG ?= .config
423 export KCONFIG_CONFIG
425 # SHELL used by kbuild
428 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
429 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
430 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
433 ifneq ($(filter %/,$(LLVM)),)
434 LLVM_PREFIX := $(LLVM)
435 else ifneq ($(filter -%,$(LLVM)),)
436 LLVM_SUFFIX := $(LLVM)
439 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
440 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
446 HOSTPKG_CONFIG = pkg-config
448 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
449 -O2 -fomit-frame-pointer -std=gnu11
450 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
451 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
453 # These flags apply to all Rust code in the tree, including the kernel and
455 export rust_common_flags := --edition=2021 \
456 -Zbinary_dep_depinfo=y \
457 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
458 -Dunreachable_pub -Dnon_ascii_idents \
460 -Drustdoc::missing_crate_level_docs \
461 -Dclippy::correctness -Dclippy::style \
462 -Dclippy::suspicious -Dclippy::complexity \
464 -Dclippy::let_unit_value -Dclippy::mut_mut \
465 -Dclippy::needless_bitwise_bool \
466 -Dclippy::needless_continue \
467 -Dclippy::no_mangle_with_rust_abi \
470 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
471 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
472 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
473 -Zallow-features= $(HOSTRUSTFLAGS)
474 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
475 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
477 # Make variables (CC, etc...)
480 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
481 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
482 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
483 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
484 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
485 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
486 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
487 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
489 CC = $(CROSS_COMPILE)gcc
490 LD = $(CROSS_COMPILE)ld
491 AR = $(CROSS_COMPILE)ar
492 NM = $(CROSS_COMPILE)nm
493 OBJCOPY = $(CROSS_COMPILE)objcopy
494 OBJDUMP = $(CROSS_COMPILE)objdump
495 READELF = $(CROSS_COMPILE)readelf
496 STRIP = $(CROSS_COMPILE)strip
501 CLIPPY_DRIVER = clippy-driver
505 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
509 INSTALLKERNEL := installkernel
522 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
523 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
534 # Use USERINCLUDE when you must reference the UAPI directories only.
536 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
537 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
538 -I$(srctree)/include/uapi \
539 -I$(objtree)/include/generated/uapi \
540 -include $(srctree)/include/linux/compiler-version.h \
541 -include $(srctree)/include/linux/kconfig.h
543 # Use LINUXINCLUDE when you must reference the include/ directory.
544 # Needed to be compatible with the O= option
546 -I$(srctree)/arch/$(SRCARCH)/include \
547 -I$(objtree)/arch/$(SRCARCH)/include/generated \
548 $(if $(building_out_of_srctree),-I$(srctree)/include) \
549 -I$(objtree)/include \
552 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
555 KBUILD_CFLAGS += -std=gnu11
556 KBUILD_CFLAGS += -fshort-wchar
557 KBUILD_CFLAGS += -funsigned-char
558 KBUILD_CFLAGS += -fno-common
559 KBUILD_CFLAGS += -fno-PIE
560 KBUILD_CFLAGS += -fno-strict-aliasing
562 KBUILD_CPPFLAGS := -D__KERNEL__
563 KBUILD_RUSTFLAGS := $(rust_common_flags) \
564 --target=$(objtree)/scripts/target.json \
565 -Cpanic=abort -Cembed-bitcode=n -Clto=n \
566 -Cforce-unwind-tables=n -Ccodegen-units=1 \
567 -Csymbol-mangling-version=v0 \
568 -Crelocation-model=static \
569 -Zfunction-sections=n \
570 -Dclippy::float_arithmetic
572 KBUILD_AFLAGS_KERNEL :=
573 KBUILD_CFLAGS_KERNEL :=
574 KBUILD_RUSTFLAGS_KERNEL :=
575 KBUILD_AFLAGS_MODULE := -DMODULE
576 KBUILD_CFLAGS_MODULE := -DMODULE
577 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
578 KBUILD_LDFLAGS_MODULE :=
582 ifeq ($(KBUILD_CLIPPY),1)
583 RUSTC_OR_CLIPPY_QUIET := CLIPPY
584 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
586 RUSTC_OR_CLIPPY_QUIET := RUSTC
587 RUSTC_OR_CLIPPY = $(RUSTC)
594 # Allows the usage of unstable features in stable compilers.
595 export RUSTC_BOOTSTRAP := 1
597 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
598 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
599 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
600 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
601 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
602 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
603 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
604 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
606 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
607 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
608 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
609 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
610 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
611 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
613 # Files to ignore in find ... statements
615 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
616 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
619 # ===========================================================================
620 # Rules shared between *config targets and build targets
622 # Basic helpers built in scripts/basic/
623 PHONY += scripts_basic
625 $(Q)$(MAKE) $(build)=scripts/basic
627 PHONY += outputmakefile
628 ifdef building_out_of_srctree
629 # Before starting out-of-tree build, make sure the source tree is clean.
630 # outputmakefile generates a Makefile in the output directory, if using a
631 # separate output directory. This allows convenient use of make in the
633 # At the same time when output Makefile generated, generate .gitignore to
634 # ignore whole output directory
636 quiet_cmd_makefile = GEN Makefile
638 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
639 echo "include $(srctree)/Makefile"; \
643 @if [ -f $(srctree)/.config -o \
644 -d $(srctree)/include/config -o \
645 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
647 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
648 echo >&2 "*** in $(abs_srctree)";\
652 $(Q)ln -fsn $(srctree) source
654 $(Q)test -e .gitignore || \
655 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
658 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
659 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
660 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
661 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
662 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
664 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
665 include $(srctree)/scripts/Makefile.clang
668 # Include this also for config targets because some architectures need
669 # cc-cross-prefix to determine CROSS_COMPILE.
671 include $(srctree)/scripts/Makefile.compiler
675 # ===========================================================================
676 # *config targets only - make sure prerequisites are updated, and descend
677 # in scripts/kconfig to make the *config target
679 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
680 # KBUILD_DEFCONFIG may point out an alternative default configuration
681 # used for 'make defconfig'
682 include $(srctree)/arch/$(SRCARCH)/Makefile
683 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
685 config: outputmakefile scripts_basic FORCE
686 $(Q)$(MAKE) $(build)=scripts/kconfig $@
688 %config: outputmakefile scripts_basic FORCE
689 $(Q)$(MAKE) $(build)=scripts/kconfig $@
692 # ===========================================================================
693 # Build targets only - this includes vmlinux, arch-specific targets, clean
694 # targets and others. In general all targets except *config targets.
696 # If building an external module we do not care about the all: rule
697 # but instead __all depend on modules
699 ifeq ($(KBUILD_EXTMOD),)
707 # Decide whether to build built-in, modular, or both.
708 # Normally, just do built-in.
713 # If we have only "make modules", don't compile built-in objects.
714 ifeq ($(MAKECMDGOALS),modules)
718 # If we have "make <whatever> modules", compile modules
719 # in addition to whatever we do anyway.
720 # Just "make" or "make all" shall build modules as well
722 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
726 ifeq ($(MAKECMDGOALS),)
730 export KBUILD_MODULES KBUILD_BUILTIN
733 include include/config/auto.conf
736 ifeq ($(KBUILD_EXTMOD),)
737 # Objects we will link into vmlinux / subdirs we need to visit
741 endif # KBUILD_EXTMOD
743 # The all: target is the default when no target is given on the
745 # This allow a user to issue only 'make' to build a kernel including modules
746 # Defaults to vmlinux, but the arch makefile usually adds further targets
749 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
750 ifdef CONFIG_CC_IS_GCC
751 CFLAGS_GCOV += -fno-tree-loop-im
755 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
756 ifdef CONFIG_FUNCTION_TRACER
757 CC_FLAGS_FTRACE := -pg
760 include $(srctree)/arch/$(SRCARCH)/Makefile
763 ifdef may-sync-config
764 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
765 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
766 # because some architectures define CROSS_COMPILE there.
767 include include/config/auto.conf.cmd
771 @echo >&2 '*** Configuration file "$@" not found!'
773 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
774 @echo >&2 '*** "make menuconfig" or "make xconfig").'
778 # The actual configuration files used during the build are stored in
779 # include/generated/ and include/config/. Update them if .config is newer than
780 # include/config/auto.conf (which mirrors .config).
782 # This exploits the 'multi-target pattern rule' trick.
783 # The syncconfig should be executed only once to make all the targets.
784 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
786 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
787 # so you cannot notice that Kconfig is waiting for the user input.
788 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
789 $(Q)$(kecho) " SYNC $@"
790 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
791 else # !may-sync-config
792 # External modules and some install targets need include/generated/autoconf.h
793 # and include/config/auto.conf but do not care if they are up-to-date.
794 # Use auto.conf to trigger the test
795 PHONY += include/config/auto.conf
797 include/config/auto.conf:
798 @test -e include/generated/autoconf.h -a -e $@ || ( \
800 echo >&2 " ERROR: Kernel configuration is invalid."; \
801 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
802 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
806 endif # may-sync-config
809 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
811 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
813 KBUILD_RUSTFLAGS += -Copt-level=2
814 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
816 KBUILD_RUSTFLAGS += -Copt-level=s
819 # Always set `debug-assertions` and `overflow-checks` because their default
820 # depends on `opt-level` and `debug-assertions`, respectively.
821 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
822 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
824 # Tell gcc to never replace conditional load with a non-conditional one
825 ifdef CONFIG_CC_IS_GCC
826 # gcc-10 renamed --param=allow-store-data-races=0 to
827 # -fno-allow-store-data-races.
828 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
829 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
832 ifdef CONFIG_READABLE_ASM
833 # Disable optimizations that make assembler listings hard to read.
834 # reorder blocks reorders the control in the function
835 # ipa clone creates specialized cloned functions
836 # partial inlining inlines only parts of functions
837 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
840 stackp-flags-y := -fno-stack-protector
841 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
842 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
844 KBUILD_CFLAGS += $(stackp-flags-y)
846 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
847 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
849 ifdef CONFIG_FRAME_POINTER
850 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
851 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
853 # Some targets (ARM with Thumb2, for example), can't be built with frame
854 # pointers. For those, we don't have FUNCTION_TRACER automatically
855 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
856 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
857 # -fomit-frame-pointer with FUNCTION_TRACER.
858 # In the Rust target specification, "frame-pointer" is set explicitly
860 ifndef CONFIG_FUNCTION_TRACER
861 KBUILD_CFLAGS += -fomit-frame-pointer
865 # Initialize all stack variables with a 0xAA pattern.
866 ifdef CONFIG_INIT_STACK_ALL_PATTERN
867 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
870 # Initialize all stack variables with a zero value.
871 ifdef CONFIG_INIT_STACK_ALL_ZERO
872 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
873 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
874 # https://github.com/llvm/llvm-project/issues/44842
875 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
876 export CC_AUTO_VAR_INIT_ZERO_ENABLER
877 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
881 # While VLAs have been removed, GCC produces unreachable stack probes
882 # for the randomize_kstack_offset feature. Disable it for all compilers.
883 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
885 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
886 ifdef CONFIG_ZERO_CALL_USED_REGS
887 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
890 ifdef CONFIG_FUNCTION_TRACER
891 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
892 CC_FLAGS_FTRACE += -mrecord-mcount
893 ifdef CONFIG_HAVE_NOP_MCOUNT
894 ifeq ($(call cc-option-yn, -mnop-mcount),y)
895 CC_FLAGS_FTRACE += -mnop-mcount
896 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
900 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
901 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
902 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
905 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
906 ifdef CONFIG_HAVE_C_RECORDMCOUNT
907 BUILD_C_RECORDMCOUNT := y
908 export BUILD_C_RECORDMCOUNT
911 ifdef CONFIG_HAVE_FENTRY
912 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
913 ifeq ($(call cc-option-yn, -mfentry),y)
914 CC_FLAGS_FTRACE += -mfentry
915 CC_FLAGS_USING += -DCC_USING_FENTRY
918 export CC_FLAGS_FTRACE
919 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
920 KBUILD_AFLAGS += $(CC_FLAGS_USING)
923 # We trigger additional mismatches with less inlining
924 ifdef CONFIG_DEBUG_SECTION_MISMATCH
925 KBUILD_CFLAGS += -fno-inline-functions-called-once
928 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
929 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
930 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
931 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
932 LDFLAGS_vmlinux += --gc-sections
935 ifdef CONFIG_SHADOW_CALL_STACK
936 ifndef CONFIG_DYNAMIC_SCS
937 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
938 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
943 ifdef CONFIG_LTO_CLANG
944 ifdef CONFIG_LTO_CLANG_THIN
945 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
946 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
948 CC_FLAGS_LTO := -flto
950 CC_FLAGS_LTO += -fvisibility=hidden
952 # Limit inlining across translation units to reduce binary size
953 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
955 # Check for frame size exceeding threshold during prolog/epilog insertion
956 # when using lld < 13.0.0.
957 ifneq ($(CONFIG_FRAME_WARN),0)
958 ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
959 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
965 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
966 KBUILD_AFLAGS += -fno-lto
970 ifdef CONFIG_CFI_CLANG
971 CC_FLAGS_CFI := -fsanitize=kcfi
972 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
976 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
977 # Set the minimal function alignment. Use the newer GCC option
978 # -fmin-function-alignment if it is available, or fall back to -falign-funtions.
979 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT.
980 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT
981 KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT)
983 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
987 # arch Makefile may override CC so keep this after arch Makefile is included
988 NOSTDINC_FLAGS += -nostdinc
990 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
991 # the kernel uses only C99 flexible arrays for dynamically sized trailing
992 # arrays. Enforce this for everything that may examine structure sizes and
993 # perform bounds checking.
994 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
996 #Currently, disable -Wstringop-overflow for GCC 11, globally.
997 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
998 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow)
1000 # disable invalid "can't wrap" optimizations for signed / pointers
1001 KBUILD_CFLAGS += -fno-strict-overflow
1003 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1004 KBUILD_CFLAGS += -fno-stack-check
1006 # conserve stack if available
1007 ifdef CONFIG_CC_IS_GCC
1008 KBUILD_CFLAGS += -fconserve-stack
1011 # change __FILE__ to the relative path from the srctree
1012 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1014 # include additional Makefiles when needed
1015 include-y := scripts/Makefile.extrawarn
1016 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1017 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1018 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1019 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1020 include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan
1021 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1022 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1023 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
1024 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1026 include $(addprefix $(srctree)/, $(include-y))
1028 # scripts/Makefile.gcc-plugins is intentionally included last.
1029 # Do not add $(call cc-option,...) below this line. When you build the kernel
1030 # from the clean source tree, the GCC plugins do not exist at this point.
1032 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1033 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1034 KBUILD_AFLAGS += $(KAFLAGS)
1035 KBUILD_CFLAGS += $(KCFLAGS)
1036 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1038 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1039 LDFLAGS_vmlinux += --build-id=sha1
1041 KBUILD_LDFLAGS += -z noexecstack
1042 ifeq ($(CONFIG_LD_IS_BFD),y)
1043 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1046 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1047 LDFLAGS_vmlinux += -X
1050 ifeq ($(CONFIG_RELR),y)
1051 # ld.lld before 15 did not support -z pack-relative-relocs.
1052 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1055 # We never want expected sections to be placed heuristically by the
1056 # linker. All sections should be explicitly named in the linker script.
1057 ifdef CONFIG_LD_ORPHAN_WARN
1058 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1061 # Align the bit size of userspace programs with the kernel
1062 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1063 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1065 # make the checker run with the right architecture
1066 CHECKFLAGS += --arch=$(ARCH)
1068 # insure the checker run with the right endianness
1069 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1071 # the checker needs the correct machine size
1072 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1074 # Default kernel image to build when no specific target is given.
1075 # KBUILD_IMAGE may be overruled on the command line or
1076 # set in the environment
1077 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1078 # this default value
1079 export KBUILD_IMAGE ?= vmlinux
1082 # INSTALL_PATH specifies where to place the updated kernel and system map
1083 # images. Default is /boot, but you can set it to other values
1084 export INSTALL_PATH ?= /boot
1087 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1088 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1089 # an argument if needed. Otherwise it defaults to the kernel install path
1091 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1094 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1095 # relocations required by build roots. This is not defined in the
1096 # makefile but the argument can be passed to make if needed.
1099 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1104 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1105 export MODORDER := $(extmod_prefix)modules.order
1106 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1108 ifeq ($(KBUILD_EXTMOD),)
1111 clean-dirs := $(sort . Documentation \
1112 $(patsubst %/,%,$(filter %/, $(core-) \
1113 $(drivers-) $(libs-))))
1115 export ARCH_CORE := $(core-y)
1116 export ARCH_LIB := $(filter %/, $(libs-y))
1117 export ARCH_DRIVERS := $(drivers-y) $(drivers-m)
1118 # Externally visible symbols (used by link-vmlinux.sh)
1120 KBUILD_VMLINUX_OBJS := ./built-in.a
1121 ifdef CONFIG_MODULES
1122 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1123 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1125 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1128 export KBUILD_VMLINUX_LIBS
1129 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1131 ifdef CONFIG_TRIM_UNUSED_KSYMS
1132 # For the kernel to actually contain only the needed exported symbols,
1133 # we have to build modules as well to determine what those symbols are.
1137 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1138 quiet_cmd_ar_vmlinux.a = AR $@
1139 cmd_ar_vmlinux.a = \
1141 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1142 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1144 targets += vmlinux.a
1145 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1146 $(call if_changed,ar_vmlinux.a)
1149 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1150 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1152 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1156 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1157 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1158 # unrelated; the decompressors just happen to have the same base name,
1159 # arch/*/boot/compressed/vmlinux.
1160 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1162 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1163 # https://savannah.gnu.org/bugs/?61463
1164 # For Make > 4.4, the following simple code will work:
1165 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1166 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1167 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1168 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1169 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1171 # The actual objects are generated when descending,
1172 # make sure no implicit rule kicks in
1173 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1175 ifeq ($(origin KERNELRELEASE),file)
1176 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1178 filechk_kernel.release = echo $(KERNELRELEASE)
1181 # Store (new) KERNELRELEASE string in include/config/kernel.release
1182 include/config/kernel.release: FORCE
1183 $(call filechk,kernel.release)
1185 # Additional helpers built in scripts/
1186 # Carefully list dependencies so we do not try to build scripts twice
1189 scripts: scripts_basic scripts_dtc
1190 $(Q)$(MAKE) $(build)=$(@)
1192 # Things we need to do before we recursively start building the kernel
1193 # or the modules are listed in "prepare".
1194 # A multi level approach is used. prepareN is processed before prepareN-1.
1195 # archprepare is used in arch Makefiles and when processed asm symlink,
1196 # version.h and scripts_basic is processed / created.
1198 PHONY += prepare archprepare
1200 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1201 asm-generic $(version_h) include/generated/utsrelease.h \
1202 include/generated/compile.h include/generated/autoconf.h remove-stale-files
1204 prepare0: archprepare
1205 $(Q)$(MAKE) $(build)=scripts/mod
1206 $(Q)$(MAKE) $(build)=. prepare
1208 # All the preparing..
1211 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1212 $(Q)$(MAKE) $(build)=rust
1215 PHONY += remove-stale-files
1217 $(Q)$(srctree)/scripts/remove-stale-files
1219 # Support for using generic headers in asm-generic
1220 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1222 PHONY += asm-generic uapi-asm-generic
1223 asm-generic: uapi-asm-generic
1224 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1225 generic=include/asm-generic
1227 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1228 generic=include/uapi/asm-generic
1230 # Generate some files
1231 # ---------------------------------------------------------------------------
1233 # KERNELRELEASE can change from a few different places, meaning version.h
1234 # needs to be updated, so this check is forced on all builds
1237 define filechk_utsrelease.h
1238 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1239 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1242 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1245 define filechk_version.h
1246 if [ $(SUBLEVEL) -gt 255 ]; then \
1247 echo \#define LINUX_VERSION_CODE $(shell \
1248 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1250 echo \#define LINUX_VERSION_CODE $(shell \
1251 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1253 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1254 ((c) > 255 ? 255 : (c)))'; \
1255 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1256 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1257 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1260 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1261 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1263 $(call filechk,version.h)
1265 include/generated/utsrelease.h: include/config/kernel.release FORCE
1266 $(call filechk,utsrelease.h)
1268 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1269 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1271 include/generated/compile.h: FORCE
1272 $(call filechk,compile.h)
1276 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1277 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1279 # ---------------------------------------------------------------------------
1282 #Default location for installed headers
1283 export INSTALL_HDR_PATH = $(objtree)/usr
1285 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1286 cmd_headers_install = \
1287 mkdir -p $(INSTALL_HDR_PATH); \
1288 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1289 usr/include $(INSTALL_HDR_PATH)
1291 PHONY += headers_install
1292 headers_install: headers
1293 $(call cmd,headers_install)
1295 PHONY += archheaders archscripts
1297 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1300 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1301 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1302 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1303 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1305 ifdef CONFIG_HEADERS_INSTALL
1309 PHONY += scripts_unifdef
1310 scripts_unifdef: scripts_basic
1311 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1313 # ---------------------------------------------------------------------------
1316 # Many distributions have the custom install script, /sbin/installkernel.
1317 # If DKMS is installed, 'make install' will eventually recurse back
1318 # to this Makefile to build and install external modules.
1319 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1321 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1322 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1324 # ---------------------------------------------------------------------------
1327 PHONY += vdso_install
1328 vdso_install: export INSTALL_FILES = $(vdso-install-y)
1330 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
1332 # ---------------------------------------------------------------------------
1335 ifdef CONFIG_OBJTOOL
1336 prepare: tools/objtool
1340 ifdef CONFIG_DEBUG_INFO_BTF
1341 prepare: tools/bpf/resolve_btfids
1345 PHONY += resolve_btfids_clean
1347 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1349 # tools/bpf/resolve_btfids directory might not exist
1350 # in output directory, skip its clean in that case
1351 resolve_btfids_clean:
1352 ifneq ($(wildcard $(resolve_btfids_O)),)
1353 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1356 # Clear a bunch of variables before executing the submake
1357 ifeq ($(quiet),silent_)
1362 $(Q)mkdir -p $(objtree)/tools
1363 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1366 $(Q)mkdir -p $(objtree)/tools
1367 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1369 # ---------------------------------------------------------------------------
1374 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1376 kselftest-%: headers FORCE
1377 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1379 PHONY += kselftest-merge
1381 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1382 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1383 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1384 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1386 # ---------------------------------------------------------------------------
1389 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1390 dtstree := arch/$(SRCARCH)/boot/dts
1396 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1398 %.dtbo: dtbs_prepare
1399 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1401 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1403 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1
1405 # include/config/kernel.release is actually needed when installing DTBs because
1406 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1407 # dtbs_install depend on it as dtbs_install may run as root.
1408 dtbs_prepare: include/config/kernel.release scripts_dtc
1410 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1414 ifneq ($(CHECK_DTBS),)
1415 dtbs_prepare: dt_binding_check
1421 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree)
1423 ifdef CONFIG_OF_EARLY_FLATTREE
1429 PHONY += scripts_dtc
1430 scripts_dtc: scripts_basic
1431 $(Q)$(MAKE) $(build)=scripts/dtc
1433 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1434 export CHECK_DT_BINDING=y
1437 PHONY += dt_binding_check
1438 dt_binding_check: scripts_dtc
1439 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1441 PHONY += dt_compatible_check
1442 dt_compatible_check: dt_binding_check
1443 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1445 # ---------------------------------------------------------------------------
1448 ifdef CONFIG_MODULES
1450 # By default, build modules as well
1454 # When we're building modules with modversions, we need to consider
1455 # the built-in objects during the descend as well, in order to
1456 # make sure the checksums are up to date before we record them.
1457 ifdef CONFIG_MODVERSIONS
1464 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1466 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1471 modules: modules_prepare
1473 # Target to prepare building external modules
1474 modules_prepare: prepare
1475 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1477 endif # CONFIG_MODULES
1480 # Cleaning is done on three levels.
1481 # make clean Delete most generated files
1482 # Leave enough to build external modules
1483 # make mrproper Delete the current configuration, and all generated files
1484 # make distclean Remove editor backup files, patch leftover files and the like
1486 # Directories & files removed with 'make clean'
1487 CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1488 modules.builtin modules.builtin.modinfo modules.nsdeps \
1489 compile_commands.json .thinlto-cache rust/test \
1490 rust-project.json .vmlinux.objs .vmlinux.export.c
1492 # Directories & files removed with 'make mrproper'
1493 MRPROPER_FILES += include/config include/generated \
1494 arch/$(SRCARCH)/include/generated .objdiff \
1495 debian snap tar-install \
1496 .config .config.old .version \
1498 certs/signing_key.pem \
1504 # clean - Delete most, but leave enough to build external modules
1506 clean: rm-files := $(CLEAN_FILES)
1508 PHONY += archclean vmlinuxclean
1511 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1512 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1514 clean: archclean vmlinuxclean resolve_btfids_clean
1516 # mrproper - Delete all generated files, including .config
1518 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1519 mrproper-dirs := $(addprefix _mrproper_,scripts)
1521 PHONY += $(mrproper-dirs) mrproper
1523 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1525 mrproper: clean $(mrproper-dirs)
1527 @find . $(RCS_FIND_IGNORE) \
1528 \( -name '*.rmeta' \) \
1529 -type f -print | xargs rm -f
1536 @find . $(RCS_FIND_IGNORE) \
1537 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1538 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1539 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1540 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1541 -type f -print | xargs rm -f
1544 # Packaging of the kernel to various formats
1545 # ---------------------------------------------------------------------------
1548 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1549 %pkg: include/config/kernel.release FORCE
1550 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1552 # Brief documentation of the typical targets used
1553 # ---------------------------------------------------------------------------
1555 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1556 boards := $(sort $(notdir $(boards)))
1557 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1558 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1562 @echo 'Cleaning targets:'
1563 @echo ' clean - Remove most generated files but keep the config and'
1564 @echo ' enough build support to build external modules'
1565 @echo ' mrproper - Remove all generated files + config + various backup files'
1566 @echo ' distclean - mrproper + remove editor backup and patch files'
1568 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1570 @echo 'Other generic targets:'
1571 @echo ' all - Build all targets marked with [*]'
1572 @echo '* vmlinux - Build the bare kernel'
1573 @echo '* modules - Build all modules'
1574 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1575 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1576 @echo ' dir/ - Build all files in dir and below'
1577 @echo ' dir/file.[ois] - Build specified target only'
1578 @echo ' dir/file.ll - Build the LLVM assembly file'
1579 @echo ' (requires compiler support for LLVM assembly generation)'
1580 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1581 @echo ' (requires a recent binutils and recent build (System.map))'
1582 @echo ' dir/file.ko - Build module including final link'
1583 @echo ' modules_prepare - Set up for building external modules'
1584 @echo ' tags/TAGS - Generate tags file for editors'
1585 @echo ' cscope - Generate cscope index'
1586 @echo ' gtags - Generate GNU GLOBAL index'
1587 @echo ' kernelrelease - Output the release version string (use with make -s)'
1588 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1589 @echo ' image_name - Output the image name (use with make -s)'
1590 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1591 echo ' (default: $(INSTALL_HDR_PATH))'; \
1593 @echo 'Static analysers:'
1594 @echo ' checkstack - Generate a list of stack hogs and consider all functions'
1595 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)'
1596 @echo ' versioncheck - Sanity check on version.h usage'
1597 @echo ' includecheck - Check for duplicate included header files'
1598 @echo ' export_report - List the usages of all exported symbols'
1599 @echo ' headerdep - Detect inclusion cycles in headers'
1600 @echo ' coccicheck - Check with Coccinelle'
1601 @echo ' clang-analyzer - Check with clang static analyzer'
1602 @echo ' clang-tidy - Check with clang-tidy'
1605 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1607 @echo 'Kernel selftest:'
1608 @echo ' kselftest - Build and run kernel selftest'
1609 @echo ' Build, install, and boot kernel before'
1610 @echo ' running kselftest on it'
1611 @echo ' Run as root for full coverage'
1612 @echo ' kselftest-all - Build kernel selftest'
1613 @echo ' kselftest-install - Build and install kernel selftest'
1614 @echo ' kselftest-clean - Remove all generated kselftest files'
1615 @echo ' kselftest-merge - Merge all the config dependencies of'
1616 @echo ' kselftest to existing .config.'
1618 @echo 'Rust targets:'
1619 @echo ' rustavailable - Checks whether the Rust toolchain is'
1620 @echo ' available and, if not, explains why.'
1621 @echo ' rustfmt - Reformat all the Rust code in the kernel'
1622 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel'
1623 @echo ' is formatted, printing a diff otherwise.'
1624 @echo ' rustdoc - Generate Rust documentation'
1625 @echo ' (requires kernel .config)'
1626 @echo ' rusttest - Runs the Rust tests'
1627 @echo ' (requires kernel .config; downloads external repos)'
1628 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1629 @echo ' (requires kernel .config)'
1630 @echo ' dir/file.[os] - Build specified target only'
1631 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1632 @echo ' Run with RUSTFMT=n to skip reformatting if needed.'
1633 @echo ' The output is not intended to be compilable.'
1634 @echo ' dir/file.ll - Build the LLVM assembly file'
1637 echo 'Devicetree:'; \
1638 echo '* dtbs - Build device tree blobs for enabled boards'; \
1639 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1640 echo ' dt_binding_check - Validate device tree binding documents'; \
1641 echo ' dtbs_check - Validate device tree source files';\
1644 @echo 'Userspace tools targets:'
1645 @echo ' use "make tools/help"'
1646 @echo ' or "cd tools; make help"'
1648 @echo 'Kernel packaging:'
1649 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1651 @echo 'Documentation targets:'
1652 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1654 @echo 'Architecture-specific targets ($(SRCARCH)):'
1656 echo ' No architecture-specific help defined for $(SRCARCH)')
1659 $(foreach b, $(boards), \
1660 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1662 @$(if $(board-dirs), \
1663 $(foreach b, $(board-dirs), \
1664 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1665 printf " %-16s - Show all of the above\\n" help-boards; \
1668 @echo ' make V=n [targets] 1: verbose build'
1669 @echo ' 2: give reason for rebuild of target'
1670 @echo ' V=1 and V=2 can be combined with V=12'
1671 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1672 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1673 @echo ' (sparse by default)'
1674 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1675 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1676 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where'
1677 @echo ' 1: warnings which may be relevant and do not occur too often'
1678 @echo ' 2: warnings which occur quite often but may still be relevant'
1679 @echo ' 3: more obscure warnings, can most likely be ignored'
1680 @echo ' c: extra checks in the configuration stage (Kconfig)'
1681 @echo ' e: warnings are being treated as errors'
1682 @echo ' Multiple levels can be combined with W=12 or W=123'
1684 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1685 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1688 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1689 @echo 'For further info see the ./README file'
1692 help-board-dirs := $(addprefix help-,$(board-dirs))
1694 help-boards: $(help-board-dirs)
1696 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1698 $(help-board-dirs): help-%:
1699 @echo 'Architecture-specific targets ($(SRCARCH) $*):'
1700 @$(if $(boards-per-dir), \
1701 $(foreach b, $(boards-per-dir), \
1702 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1706 # Documentation targets
1707 # ---------------------------------------------------------------------------
1708 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1709 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1710 PHONY += $(DOC_TARGETS)
1712 $(Q)$(MAKE) $(build)=Documentation $@
1716 # ---------------------------------------------------------------------------
1718 # "Is Rust available?" target
1719 PHONY += rustavailable
1721 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1723 # Documentation target
1725 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1728 $(Q)$(MAKE) $(build)=rust $@
1733 $(Q)$(MAKE) $(build)=rust $@
1735 # Formatting targets
1736 PHONY += rustfmt rustfmtcheck
1738 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1740 # We match using absolute paths since `find` does not resolve them
1741 # when matching, which is a problem when e.g. `srctree` is `..`.
1742 # We `grep` afterwards in order to remove the directory entry itself.
1744 $(Q)find $(abs_srctree) -type f -name '*.rs' \
1745 -o -path $(abs_srctree)/rust/alloc -prune \
1746 -o -path $(abs_objtree)/rust/test -prune \
1747 | grep -Fv $(abs_srctree)/rust/alloc \
1748 | grep -Fv $(abs_objtree)/rust/test \
1749 | grep -Fv generated \
1750 | xargs $(RUSTFMT) $(rustfmt_flags)
1752 rustfmtcheck: rustfmt_flags = --check
1753 rustfmtcheck: rustfmt
1756 # ---------------------------------------------------------------------------
1760 $(Q)$(srctree)/scripts/misc-check
1764 PHONY += scripts_gdb
1765 scripts_gdb: prepare0
1766 $(Q)$(MAKE) $(build)=scripts/gdb
1767 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1769 ifdef CONFIG_GDB_SCRIPTS
1773 else # KBUILD_EXTMOD
1775 filechk_kernel.release = echo $(KERNELRELEASE)
1778 # External module support.
1779 # When building external modules the kernel used as basis is considered
1780 # read-only, and no consistency checks are made and the make
1781 # system is not used on the basis kernel. If updates are required
1782 # in the basis kernel ordinary make commands (without M=...) must be used.
1784 # We are always building only modules.
1788 build-dir := $(KBUILD_EXTMOD)
1790 compile_commands.json: $(extmod_prefix)compile_commands.json
1791 PHONY += compile_commands.json
1793 clean-dirs := $(KBUILD_EXTMOD)
1794 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1795 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1798 # now expand this into a simple variable to reduce the cost of shell evaluations
1799 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1801 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1802 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1803 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1804 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1809 @echo ' Building external modules.'
1810 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1812 @echo ' modules - default target, build the module(s)'
1813 @echo ' modules_install - install the module'
1814 @echo ' clean - remove generated files in module directory only'
1815 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file'
1818 ifndef CONFIG_MODULES
1819 modules modules_install: __external_modules_error
1820 __external_modules_error:
1822 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1823 @echo >&2 '*** You cannot build or install external modules.'
1828 endif # KBUILD_EXTMOD
1830 # ---------------------------------------------------------------------------
1833 PHONY += modules modules_install modules_sign modules_prepare
1836 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1837 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1839 ifeq ($(CONFIG_MODULE_SIG),y)
1840 # modules_sign is a subset of modules_install.
1841 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1842 modules_sign: modules_install
1847 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1852 ifdef CONFIG_MODULES
1854 $(MODORDER): $(build-dir)
1857 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1858 # This is solely useful to speed up test compiles.
1860 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1861 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1864 PHONY += modules_check
1865 modules_check: $(MODORDER)
1866 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1868 else # CONFIG_MODULES
1875 endif # CONFIG_MODULES
1878 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1879 $(if $(KBUILD_MODULES), modules_check)
1880 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1883 # ---------------------------------------------------------------------------
1884 # To build individual files in subdirectories, you can do like this:
1886 # make foo/bar/baz.s
1888 # The supported suffixes for single-target are listed in 'single-targets'
1890 # To build only under specific subdirectories, you can do like this:
1896 # .ko is special because modpost is needed
1897 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1898 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1899 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1901 $(single-ko): single_modules
1903 $(single-no-ko): $(build-dir)
1906 # Remove MODORDER when done because it is not the real one.
1907 PHONY += single_modules
1908 single_modules: $(single-no-ko) modules_prepare
1909 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
1910 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1911 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1912 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1914 $(Q)rm -f $(MODORDER)
1916 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1922 # Preset locale variables to speed up the build process. Limit locale
1923 # tweaks to this spot to avoid wrong language settings when running
1924 # make menuconfig etc.
1925 # Error messages still appears in the original language
1926 PHONY += $(build-dir)
1927 $(build-dir): prepare
1928 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
1930 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1931 PHONY += $(clean-dirs) clean
1933 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1935 clean: $(clean-dirs)
1937 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1938 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
1940 -o -name '*.dtb' -o -name '*.dtbo' \
1941 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
1942 -o -name '*.dt.yaml' -o -name 'dtbs-list' \
1943 -o -name '*.dwo' -o -name '*.lst' \
1944 -o -name '*.su' -o -name '*.mod' \
1945 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1946 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1947 -o -name '*.asn1.[ch]' \
1948 -o -name '*.symtypes' -o -name 'modules.order' \
1949 -o -name '*.c.[012]*.*' \
1952 -o -name '*.*.symversions' \) -type f -print \
1953 -o -name '.tmp_*' -print \
1956 # Generate tags for editors
1957 # ---------------------------------------------------------------------------
1958 quiet_cmd_tags = GEN $@
1959 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1961 tags TAGS cscope gtags: FORCE
1964 # IDE support targets
1965 PHONY += rust-analyzer
1967 $(Q)$(MAKE) $(build)=rust $@
1969 # Script to generate missing namespace dependencies
1970 # ---------------------------------------------------------------------------
1973 nsdeps: export KBUILD_NSDEPS=1
1975 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1978 # ---------------------------------------------------------------------------
1980 quiet_cmd_gen_compile_commands = GEN $@
1981 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1983 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1984 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
1985 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1986 $(call if_changed,gen_compile_commands)
1988 targets += $(extmod_prefix)compile_commands.json
1990 PHONY += clang-tidy clang-analyzer
1992 ifdef CONFIG_CC_IS_CLANG
1993 quiet_cmd_clang_tools = CHECK $<
1994 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1996 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1997 $(call cmd,clang_tools)
1999 clang-tidy clang-analyzer:
2000 @echo "$@ requires CC=clang" >&2
2004 # Scripts to check various things for consistency
2005 # ---------------------------------------------------------------------------
2007 PHONY += includecheck versioncheck coccicheck export_report
2010 find $(srctree)/* $(RCS_FIND_IGNORE) \
2011 -name '*.[hcS]' -type f -print | sort \
2012 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2015 find $(srctree)/* $(RCS_FIND_IGNORE) \
2016 -name '*.[hcS]' -type f -print | sort \
2017 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2020 $(Q)$(BASH) $(srctree)/scripts/$@
2023 $(PERL) $(srctree)/scripts/export_report.pl
2025 PHONY += checkstack kernelrelease kernelversion image_name
2027 # UML needs a little special treatment here. It wants to use the host
2028 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2029 # else wants $(ARCH), including people doing cross-builds, which means
2030 # that $(SUBARCH) doesn't work here.
2032 CHECKSTACK_ARCH := $(SUBARCH)
2034 CHECKSTACK_ARCH := $(ARCH)
2038 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2039 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE)
2042 @$(filechk_kernel.release)
2045 @echo $(KERNELVERSION)
2048 @echo $(KBUILD_IMAGE)
2050 PHONY += run-command
2052 $(Q)$(KBUILD_RUN_COMMAND)
2054 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2055 cmd_rmfiles = rm -rf $(rm-files)
2057 # read saved command lines for existing targets
2058 existing-targets := $(wildcard $(sort $(targets)))
2060 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2062 endif # config-build
2064 endif # need-sub-make
2069 # Declare the contents of the PHONY variable as phony. We keep that
2070 # information in a variable so we can use it in if_changed and friends.