1 # SPDX-License-Identifier: GPL-2.0
6 NAME = Baby Opossum Posse
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 ($(filter output-sync,$(.FEATURES)),)
15 $(error GNU Make >= 4.0 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 abs_srctree := $(realpath $(dir $(this-makefile)))
43 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, $(KBUILD_VERBOSE)),)
94 # If the user is running make -s (silent mode), suppress echoing of
96 ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),)
98 override KBUILD_VERBOSE :=
101 export quiet Q KBUILD_VERBOSE
103 # Call a source code checker (by default, "sparse") as part of the
106 # Use 'make C=1' to enable checking of only re-compiled files.
107 # Use 'make C=2' to enable checking of *all* source files, regardless
108 # of whether they are re-compiled or not.
110 # See the file "Documentation/dev-tools/sparse.rst" for more details,
111 # including where to get the "sparse" utility.
113 ifeq ("$(origin C)", "command line")
114 KBUILD_CHECKSRC = $(C)
116 ifndef KBUILD_CHECKSRC
120 export KBUILD_CHECKSRC
122 # Enable "clippy" (a linter) as part of the Rust compilation.
124 # Use 'make CLIPPY=1' to enable it.
125 ifeq ("$(origin CLIPPY)", "command line")
126 KBUILD_CLIPPY := $(CLIPPY)
131 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
132 # directory of external module to build. Setting M= takes precedence.
133 ifeq ("$(origin M)", "command line")
134 KBUILD_EXTMOD := $(M)
137 $(if $(word 2, $(KBUILD_EXTMOD)), \
138 $(error building multiple external modules is not supported))
140 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
141 $(error module directory path cannot contain '$x')))
143 # Remove trailing slashes
144 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
145 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
150 # backward compatibility
151 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
153 ifeq ("$(origin W)", "command line")
154 KBUILD_EXTRA_WARN := $(W)
157 export KBUILD_EXTRA_WARN
159 # Kbuild will save output files in the current working directory.
160 # This does not need to match to the root of the kernel source tree.
162 # For example, you can do this:
164 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
166 # If you want to save output files in a different location, there are
167 # two syntaxes to specify it.
170 # Use "make O=dir/to/store/output/files/"
172 # 2) Set KBUILD_OUTPUT
173 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
174 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
176 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
179 # Do we want to change the working directory?
180 ifeq ("$(origin O)", "command line")
181 KBUILD_OUTPUT := $(O)
184 ifneq ($(KBUILD_OUTPUT),)
185 # $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
186 $(shell mkdir -p "$(KBUILD_OUTPUT)")
187 # $(realpath ...) resolves symlinks
188 abs_objtree := $(realpath $(KBUILD_OUTPUT))
189 $(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)"))
190 endif # ifneq ($(KBUILD_OUTPUT),)
192 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
193 $(error source directory cannot contain spaces or colons)
196 export sub_make_done := 1
198 endif # sub_make_done
200 ifeq ($(abs_objtree),$(CURDIR))
201 # Suppress "Entering directory ..." if we are at the final work directory.
202 no-print-directory := --no-print-directory
204 # Recursion to show "Entering directory ..."
208 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
209 # If --no-print-directory is unset, recurse once again to set it.
210 # You may end up recursing into __sub-make twice. This is needed due to the
211 # behavior change in GNU Make 4.4.1.
215 ifeq ($(need-sub-make),1)
217 PHONY += $(MAKECMDGOALS) __sub-make
219 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
222 # Invoke a second make in the output directory, passing relevant variables
224 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
225 -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
229 # We process the rest of the Makefile if this is the final invocation of make
231 ifeq ($(abs_srctree),$(abs_objtree))
232 # building in the source tree
234 building_out_of_srctree :=
236 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
237 # building in a subdirectory of the source tree
240 srctree := $(abs_srctree)
242 building_out_of_srctree := 1
245 ifneq ($(KBUILD_ABS_SRCTREE),)
246 srctree := $(abs_srctree)
253 ifeq ($(KBUILD_EXTMOD),)
254 ifdef building_out_of_srctree
259 export building_out_of_srctree srctree objtree VPATH
261 # To make sure we do not include .config for any of the *config targets
262 # catch them early, and hand them over to scripts/kconfig/Makefile
263 # It is allowed to specify more targets when calling make, including
264 # mixing *config targets and build targets.
265 # For example 'make oldconfig all'.
266 # Detect when mixed targets is specified, and make a second invocation
267 # of make so .config is not included in this case either (for *config).
269 version_h := include/generated/uapi/linux/version.h
271 clean-targets := %clean mrproper cleandocs
272 no-dot-config-targets := $(clean-targets) \
273 cscope gtags TAGS tags help% %docs check% coccicheck \
274 $(version_h) headers headers_% archheaders archscripts \
275 %asm-generic kernelversion %src-pkg dt_binding_check \
276 outputmakefile rustavailable rustfmt rustfmtcheck
277 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
279 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
287 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
293 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
294 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
299 need-compiler := $(may-sync-config)
301 ifneq ($(KBUILD_EXTMOD),)
305 ifeq ($(KBUILD_EXTMOD),)
306 ifneq ($(filter %config,$(MAKECMDGOALS)),)
308 ifneq ($(words $(MAKECMDGOALS)),1)
314 # We cannot build single targets and the others at the same time
315 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
317 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
322 # For "make -j clean all", "make -j mrproper defconfig all", etc.
323 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
324 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
329 # install and modules_install need also be processed one by one
330 ifneq ($(filter install,$(MAKECMDGOALS)),)
331 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
337 # ===========================================================================
338 # We're called with mixed targets (*config and build targets).
339 # Handle them one by one.
341 PHONY += $(MAKECMDGOALS) __build_one_by_one
343 $(MAKECMDGOALS): __build_one_by_one
348 for i in $(MAKECMDGOALS); do \
349 $(MAKE) -f $(srctree)/Makefile $$i; \
354 include $(srctree)/scripts/Kbuild.include
356 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
357 KERNELRELEASE = $(call read-file, include/config/kernel.release)
358 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
359 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
361 include $(srctree)/scripts/subarch.include
363 # Cross compiling and selecting different set of gcc/bin-utils
364 # ---------------------------------------------------------------------------
366 # When performing cross compilation for other architectures ARCH shall be set
367 # to the target architecture. (See arch/* for the possibilities).
368 # ARCH can be set during invocation of make:
370 # Another way is to have ARCH set in the environment.
371 # The default ARCH is the host where make is executed.
373 # CROSS_COMPILE specify the prefix used for all executables used
374 # during compilation. Only gcc and related bin-utils executables
375 # are prefixed with $(CROSS_COMPILE).
376 # CROSS_COMPILE can be set on the command line
377 # make CROSS_COMPILE=aarch64-linux-gnu-
378 # Alternatively CROSS_COMPILE can be set in the environment.
379 # Default value for CROSS_COMPILE is not to prefix executables
380 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
383 # Architecture as present in compile.h
384 UTS_MACHINE := $(ARCH)
387 # Additional ARCH settings for x86
391 ifeq ($(ARCH),x86_64)
395 # Additional ARCH settings for sparc
396 ifeq ($(ARCH),sparc32)
399 ifeq ($(ARCH),sparc64)
403 # Additional ARCH settings for parisc
404 ifeq ($(ARCH),parisc64)
408 export cross_compiling :=
409 ifneq ($(SRCARCH),$(SUBARCH))
413 KCONFIG_CONFIG ?= .config
414 export KCONFIG_CONFIG
416 # SHELL used by kbuild
419 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
420 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
421 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
424 ifneq ($(filter %/,$(LLVM)),)
425 LLVM_PREFIX := $(LLVM)
426 else ifneq ($(filter -%,$(LLVM)),)
427 LLVM_SUFFIX := $(LLVM)
430 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
431 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
437 HOSTPKG_CONFIG = pkg-config
439 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
440 -O2 -fomit-frame-pointer -std=gnu11
441 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
442 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
444 # These flags apply to all Rust code in the tree, including the kernel and
446 export rust_common_flags := --edition=2021 \
447 -Zbinary_dep_depinfo=y \
450 -Dunsafe_op_in_unsafe_fn \
455 -Wclippy::ignored_unit_patterns \
457 -Wclippy::needless_bitwise_bool \
458 -Wclippy::needless_continue \
459 -Aclippy::needless_lifetimes \
460 -Wclippy::no_mangle_with_rust_abi \
461 -Wclippy::undocumented_unsafe_blocks \
462 -Wclippy::unnecessary_safety_comment \
463 -Wclippy::unnecessary_safety_doc \
464 -Wrustdoc::missing_crate_level_docs \
465 -Wrustdoc::unescaped_backticks
467 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \
468 $(HOSTCFLAGS) -I $(srctree)/scripts/include
469 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \
470 -I $(srctree)/scripts/include
471 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
472 -Zallow-features= $(HOSTRUSTFLAGS)
473 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
474 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
476 # Make variables (CC, etc...)
479 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
480 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
481 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
482 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
483 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
484 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
485 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
486 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
488 CC = $(CROSS_COMPILE)gcc
489 LD = $(CROSS_COMPILE)ld
490 AR = $(CROSS_COMPILE)ar
491 NM = $(CROSS_COMPILE)nm
492 OBJCOPY = $(CROSS_COMPILE)objcopy
493 OBJDUMP = $(CROSS_COMPILE)objdump
494 READELF = $(CROSS_COMPILE)readelf
495 STRIP = $(CROSS_COMPILE)strip
500 CLIPPY_DRIVER = clippy-driver
503 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
507 INSTALLKERNEL := installkernel
520 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
521 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
532 # Use USERINCLUDE when you must reference the UAPI directories only.
534 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
535 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
536 -I$(srctree)/include/uapi \
537 -I$(objtree)/include/generated/uapi \
538 -include $(srctree)/include/linux/compiler-version.h \
539 -include $(srctree)/include/linux/kconfig.h
541 # Use LINUXINCLUDE when you must reference the include/ directory.
542 # Needed to be compatible with the O= option
544 -I$(srctree)/arch/$(SRCARCH)/include \
545 -I$(objtree)/arch/$(SRCARCH)/include/generated \
546 $(if $(building_out_of_srctree),-I$(srctree)/include) \
547 -I$(objtree)/include \
550 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
553 KBUILD_CFLAGS += -std=gnu11
554 KBUILD_CFLAGS += -fshort-wchar
555 KBUILD_CFLAGS += -funsigned-char
556 KBUILD_CFLAGS += -fno-common
557 KBUILD_CFLAGS += -fno-PIE
558 KBUILD_CFLAGS += -fno-strict-aliasing
560 KBUILD_CPPFLAGS := -D__KERNEL__
561 KBUILD_RUSTFLAGS := $(rust_common_flags) \
562 -Cpanic=abort -Cembed-bitcode=n -Clto=n \
563 -Cforce-unwind-tables=n -Ccodegen-units=1 \
564 -Csymbol-mangling-version=v0 \
565 -Crelocation-model=static \
566 -Zfunction-sections=n \
567 -Wclippy::float_arithmetic
569 KBUILD_AFLAGS_KERNEL :=
570 KBUILD_CFLAGS_KERNEL :=
571 KBUILD_RUSTFLAGS_KERNEL :=
572 KBUILD_AFLAGS_MODULE := -DMODULE
573 KBUILD_CFLAGS_MODULE := -DMODULE
574 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
575 KBUILD_LDFLAGS_MODULE :=
579 ifeq ($(KBUILD_CLIPPY),1)
580 RUSTC_OR_CLIPPY_QUIET := CLIPPY
581 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
583 RUSTC_OR_CLIPPY_QUIET := RUSTC
584 RUSTC_OR_CLIPPY = $(RUSTC)
587 # Allows the usage of unstable features in stable compilers.
588 export RUSTC_BOOTSTRAP := 1
590 # Allows finding `.clippy.toml` in out-of-srctree builds.
591 export CLIPPY_CONF_DIR := $(srctree)
593 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
594 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN
595 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
596 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
597 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
598 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
599 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
600 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
602 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
603 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
604 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
605 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
606 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
607 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
609 # Files to ignore in find ... statements
611 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
612 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
615 # ===========================================================================
616 # Rules shared between *config targets and build targets
618 # Basic helpers built in scripts/basic/
619 PHONY += scripts_basic
621 $(Q)$(MAKE) $(build)=scripts/basic
623 PHONY += outputmakefile
624 ifdef building_out_of_srctree
625 # Before starting out-of-tree build, make sure the source tree is clean.
626 # outputmakefile generates a Makefile in the output directory, if using a
627 # separate output directory. This allows convenient use of make in the
629 # At the same time when output Makefile generated, generate .gitignore to
630 # ignore whole output directory
632 quiet_cmd_makefile = GEN Makefile
634 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
635 echo "include $(srctree)/Makefile"; \
639 @if [ -f $(srctree)/.config -o \
640 -d $(srctree)/include/config -o \
641 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
643 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
644 echo >&2 "*** in $(abs_srctree)";\
648 $(Q)ln -fsn $(srctree) source
650 $(Q)test -e .gitignore || \
651 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
654 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
655 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
656 # CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they
657 # need export), and from include/config/auto.conf.cmd to detect the compiler
659 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
660 RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null))
662 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
663 include $(srctree)/scripts/Makefile.clang
666 # Include this also for config targets because some architectures need
667 # cc-cross-prefix to determine CROSS_COMPILE.
669 include $(srctree)/scripts/Makefile.compiler
673 # ===========================================================================
674 # *config targets only - make sure prerequisites are updated, and descend
675 # in scripts/kconfig to make the *config target
677 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
678 # KBUILD_DEFCONFIG may point out an alternative default configuration
679 # used for 'make defconfig'
680 include $(srctree)/arch/$(SRCARCH)/Makefile
681 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT
683 config: outputmakefile scripts_basic FORCE
684 $(Q)$(MAKE) $(build)=scripts/kconfig $@
686 %config: outputmakefile scripts_basic FORCE
687 $(Q)$(MAKE) $(build)=scripts/kconfig $@
690 # ===========================================================================
691 # Build targets only - this includes vmlinux, arch-specific targets, clean
692 # targets and others. In general all targets except *config targets.
694 # If building an external module we do not care about the all: rule
695 # but instead __all depend on modules
697 ifeq ($(KBUILD_EXTMOD),)
705 # Decide whether to build built-in, modular, or both.
706 # Normally, just do built-in.
711 # If we have only "make modules", don't compile built-in objects.
712 ifeq ($(MAKECMDGOALS),modules)
716 # If we have "make <whatever> modules", compile modules
717 # in addition to whatever we do anyway.
718 # Just "make" or "make all" shall build modules as well
720 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
724 ifeq ($(MAKECMDGOALS),)
728 export KBUILD_MODULES KBUILD_BUILTIN
731 include include/config/auto.conf
734 ifeq ($(KBUILD_EXTMOD),)
735 # Objects we will link into vmlinux / subdirs we need to visit
739 endif # KBUILD_EXTMOD
741 # The all: target is the default when no target is given on the
743 # This allow a user to issue only 'make' to build a kernel including modules
744 # Defaults to vmlinux, but the arch makefile usually adds further targets
747 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
748 ifdef CONFIG_CC_IS_GCC
749 CFLAGS_GCOV += -fno-tree-loop-im
753 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
754 ifdef CONFIG_FUNCTION_TRACER
755 CC_FLAGS_FTRACE := -pg
758 include $(srctree)/arch/$(SRCARCH)/Makefile
761 ifdef may-sync-config
762 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
763 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
764 # because some architectures define CROSS_COMPILE there.
765 include include/config/auto.conf.cmd
769 @echo >&2 '*** Configuration file "$@" not found!'
771 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
772 @echo >&2 '*** "make menuconfig" or "make xconfig").'
776 # The actual configuration files used during the build are stored in
777 # include/generated/ and include/config/. Update them if .config is newer than
778 # include/config/auto.conf (which mirrors .config).
780 # This exploits the 'multi-target pattern rule' trick.
781 # The syncconfig should be executed only once to make all the targets.
782 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
784 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
785 # so you cannot notice that Kconfig is waiting for the user input.
786 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
787 $(Q)$(kecho) " SYNC $@"
788 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
789 else # !may-sync-config
790 # External modules and some install targets need include/generated/autoconf.h
791 # and include/config/auto.conf but do not care if they are up-to-date.
792 # Use auto.conf to trigger the test
793 PHONY += include/config/auto.conf
795 include/config/auto.conf:
796 @test -e include/generated/autoconf.h -a -e $@ || ( \
798 echo >&2 " ERROR: Kernel configuration is invalid."; \
799 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
800 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
804 endif # may-sync-config
807 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
809 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
811 KBUILD_RUSTFLAGS += -Copt-level=2
812 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
814 KBUILD_RUSTFLAGS += -Copt-level=s
817 # Always set `debug-assertions` and `overflow-checks` because their default
818 # depends on `opt-level` and `debug-assertions`, respectively.
819 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
820 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
822 # Tell gcc to never replace conditional load with a non-conditional one
823 ifdef CONFIG_CC_IS_GCC
824 # gcc-10 renamed --param=allow-store-data-races=0 to
825 # -fno-allow-store-data-races.
826 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
827 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
830 ifdef CONFIG_READABLE_ASM
831 # Disable optimizations that make assembler listings hard to read.
832 # reorder blocks reorders the control in the function
833 # ipa clone creates specialized cloned functions
834 # partial inlining inlines only parts of functions
835 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
838 stackp-flags-y := -fno-stack-protector
839 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
840 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
842 KBUILD_CFLAGS += $(stackp-flags-y)
844 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
845 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
847 ifdef CONFIG_FRAME_POINTER
848 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
849 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
851 # Some targets (ARM with Thumb2, for example), can't be built with frame
852 # pointers. For those, we don't have FUNCTION_TRACER automatically
853 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
854 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
855 # -fomit-frame-pointer with FUNCTION_TRACER.
856 # In the Rust target specification, "frame-pointer" is set explicitly
858 ifndef CONFIG_FUNCTION_TRACER
859 KBUILD_CFLAGS += -fomit-frame-pointer
863 # Initialize all stack variables with a 0xAA pattern.
864 ifdef CONFIG_INIT_STACK_ALL_PATTERN
865 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
868 # Initialize all stack variables with a zero value.
869 ifdef CONFIG_INIT_STACK_ALL_ZERO
870 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
871 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
872 # https://github.com/llvm/llvm-project/issues/44842
873 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
874 export CC_AUTO_VAR_INIT_ZERO_ENABLER
875 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
879 # While VLAs have been removed, GCC produces unreachable stack probes
880 # for the randomize_kstack_offset feature. Disable it for all compilers.
881 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
883 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
884 ifdef CONFIG_ZERO_CALL_USED_REGS
885 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
888 ifdef CONFIG_FUNCTION_TRACER
889 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
890 CC_FLAGS_FTRACE += -mrecord-mcount
891 ifdef CONFIG_HAVE_NOP_MCOUNT
892 ifeq ($(call cc-option-yn, -mnop-mcount),y)
893 CC_FLAGS_FTRACE += -mnop-mcount
894 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
898 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
899 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
900 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
903 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
904 ifdef CONFIG_HAVE_C_RECORDMCOUNT
905 BUILD_C_RECORDMCOUNT := y
906 export BUILD_C_RECORDMCOUNT
909 ifdef CONFIG_HAVE_FENTRY
910 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
911 ifeq ($(call cc-option-yn, -mfentry),y)
912 CC_FLAGS_FTRACE += -mfentry
913 CC_FLAGS_USING += -DCC_USING_FENTRY
916 export CC_FLAGS_FTRACE
917 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
918 KBUILD_AFLAGS += $(CC_FLAGS_USING)
921 # We trigger additional mismatches with less inlining
922 ifdef CONFIG_DEBUG_SECTION_MISMATCH
923 KBUILD_CFLAGS += -fno-inline-functions-called-once
926 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
927 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
928 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
929 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
930 LDFLAGS_vmlinux += --gc-sections
933 ifdef CONFIG_SHADOW_CALL_STACK
934 ifndef CONFIG_DYNAMIC_SCS
935 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
936 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
937 KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack
942 ifdef CONFIG_LTO_CLANG
943 ifdef CONFIG_LTO_CLANG_THIN
944 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
946 CC_FLAGS_LTO := -flto
948 CC_FLAGS_LTO += -fvisibility=hidden
950 # Limit inlining across translation units to reduce binary size
951 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
955 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
956 KBUILD_AFLAGS += -fno-lto
960 ifdef CONFIG_CFI_CLANG
961 CC_FLAGS_CFI := -fsanitize=kcfi
962 ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS
963 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers
966 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects
967 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS.
968 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers
969 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI)
970 export RUSTC_FLAGS_CFI
972 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
976 # Architectures can define flags to add/remove for floating-point support
977 CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT
979 export CC_FLAGS_NO_FPU
981 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
982 # Set the minimal function alignment. Use the newer GCC option
983 # -fmin-function-alignment if it is available, or fall back to -falign-funtions.
984 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT.
985 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT
986 KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT)
988 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
992 # arch Makefile may override CC so keep this after arch Makefile is included
993 NOSTDINC_FLAGS += -nostdinc
995 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
996 # the kernel uses only C99 flexible arrays for dynamically sized trailing
997 # arrays. Enforce this for everything that may examine structure sizes and
998 # perform bounds checking.
999 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
1001 #Currently, disable -Wstringop-overflow for GCC 11, globally.
1002 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
1003 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow)
1005 # disable invalid "can't wrap" optimizations for signed / pointers
1006 KBUILD_CFLAGS += -fno-strict-overflow
1008 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1009 KBUILD_CFLAGS += -fno-stack-check
1011 # conserve stack if available
1012 ifdef CONFIG_CC_IS_GCC
1013 KBUILD_CFLAGS += -fconserve-stack
1016 # change __FILE__ to the relative path from the srctree
1017 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1019 # include additional Makefiles when needed
1020 include-y := scripts/Makefile.extrawarn
1021 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1022 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1023 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1024 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1025 include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan
1026 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1027 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1028 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
1029 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1031 include $(addprefix $(srctree)/, $(include-y))
1033 # scripts/Makefile.gcc-plugins is intentionally included last.
1034 # Do not add $(call cc-option,...) below this line. When you build the kernel
1035 # from the clean source tree, the GCC plugins do not exist at this point.
1037 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1038 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1039 KBUILD_AFLAGS += $(KAFLAGS)
1040 KBUILD_CFLAGS += $(KCFLAGS)
1041 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1043 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1044 LDFLAGS_vmlinux += --build-id=sha1
1046 KBUILD_LDFLAGS += -z noexecstack
1047 ifeq ($(CONFIG_LD_IS_BFD),y)
1048 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1051 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1052 LDFLAGS_vmlinux += -X
1055 ifeq ($(CONFIG_RELR),y)
1056 # ld.lld before 15 did not support -z pack-relative-relocs.
1057 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1060 # We never want expected sections to be placed heuristically by the
1061 # linker. All sections should be explicitly named in the linker script.
1062 ifdef CONFIG_LD_ORPHAN_WARN
1063 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1066 # Align the bit size of userspace programs with the kernel
1067 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1068 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1070 # make the checker run with the right architecture
1071 CHECKFLAGS += --arch=$(ARCH)
1073 # insure the checker run with the right endianness
1074 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1076 # the checker needs the correct machine size
1077 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1079 # Default kernel image to build when no specific target is given.
1080 # KBUILD_IMAGE may be overruled on the command line or
1081 # set in the environment
1082 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1083 # this default value
1084 export KBUILD_IMAGE ?= vmlinux
1087 # INSTALL_PATH specifies where to place the updated kernel and system map
1088 # images. Default is /boot, but you can set it to other values
1089 export INSTALL_PATH ?= /boot
1092 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1093 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1094 # an argument if needed. Otherwise it defaults to the kernel install path
1096 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1099 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1100 # relocations required by build roots. This is not defined in the
1101 # makefile but the argument can be passed to make if needed.
1104 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1109 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1110 export MODORDER := $(extmod_prefix)modules.order
1111 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1113 ifeq ($(KBUILD_EXTMOD),)
1116 clean-dirs := $(sort . Documentation \
1117 $(patsubst %/,%,$(filter %/, $(core-) \
1118 $(drivers-) $(libs-))))
1120 export ARCH_CORE := $(core-y)
1121 export ARCH_LIB := $(filter %/, $(libs-y))
1122 export ARCH_DRIVERS := $(drivers-y) $(drivers-m)
1123 # Externally visible symbols (used by link-vmlinux.sh)
1125 KBUILD_VMLINUX_OBJS := ./built-in.a
1126 ifdef CONFIG_MODULES
1127 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1128 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1130 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1133 export KBUILD_VMLINUX_LIBS
1134 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1136 ifdef CONFIG_TRIM_UNUSED_KSYMS
1137 # For the kernel to actually contain only the needed exported symbols,
1138 # we have to build modules as well to determine what those symbols are.
1142 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1143 quiet_cmd_ar_vmlinux.a = AR $@
1144 cmd_ar_vmlinux.a = \
1146 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1147 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1149 targets += vmlinux.a
1150 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1151 $(call if_changed,ar_vmlinux.a)
1154 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1155 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1157 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1161 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1162 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1163 # unrelated; the decompressors just happen to have the same base name,
1164 # arch/*/boot/compressed/vmlinux.
1165 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1167 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1168 # https://savannah.gnu.org/bugs/?61463
1169 # For Make > 4.4, the following simple code will work:
1170 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1171 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1172 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1173 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1174 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1176 # The actual objects are generated when descending,
1177 # make sure no implicit rule kicks in
1178 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1180 ifeq ($(origin KERNELRELEASE),file)
1181 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1183 filechk_kernel.release = echo $(KERNELRELEASE)
1186 # Store (new) KERNELRELEASE string in include/config/kernel.release
1187 include/config/kernel.release: FORCE
1188 $(call filechk,kernel.release)
1190 # Additional helpers built in scripts/
1191 # Carefully list dependencies so we do not try to build scripts twice
1194 scripts: scripts_basic scripts_dtc
1195 $(Q)$(MAKE) $(build)=$(@)
1197 # Things we need to do before we recursively start building the kernel
1198 # or the modules are listed in "prepare".
1199 # A multi level approach is used. prepareN is processed before prepareN-1.
1200 # archprepare is used in arch Makefiles and when processed asm symlink,
1201 # version.h and scripts_basic is processed / created.
1203 PHONY += prepare archprepare
1205 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1206 asm-generic $(version_h) include/generated/utsrelease.h \
1207 include/generated/compile.h include/generated/autoconf.h remove-stale-files
1209 prepare0: archprepare
1210 $(Q)$(MAKE) $(build)=scripts/mod
1211 $(Q)$(MAKE) $(build)=. prepare
1213 # All the preparing..
1216 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1217 $(Q)$(MAKE) $(build)=rust
1220 PHONY += remove-stale-files
1222 $(Q)$(srctree)/scripts/remove-stale-files
1224 # Support for using generic headers in asm-generic
1225 asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj
1227 PHONY += asm-generic uapi-asm-generic
1228 asm-generic: uapi-asm-generic
1229 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1230 generic=include/asm-generic
1232 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1233 generic=include/uapi/asm-generic
1235 # Generate some files
1236 # ---------------------------------------------------------------------------
1238 # KERNELRELEASE can change from a few different places, meaning version.h
1239 # needs to be updated, so this check is forced on all builds
1242 define filechk_utsrelease.h
1243 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1244 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1247 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1250 define filechk_version.h
1251 if [ $(SUBLEVEL) -gt 255 ]; then \
1252 echo \#define LINUX_VERSION_CODE $(shell \
1253 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1255 echo \#define LINUX_VERSION_CODE $(shell \
1256 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1258 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1259 ((c) > 255 ? 255 : (c)))'; \
1260 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1261 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1262 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1265 $(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1266 $(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0)
1268 $(call filechk,version.h)
1270 include/generated/utsrelease.h: include/config/kernel.release FORCE
1271 $(call filechk,utsrelease.h)
1273 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1274 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1276 include/generated/compile.h: FORCE
1277 $(call filechk,compile.h)
1281 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1282 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1284 # ---------------------------------------------------------------------------
1287 #Default location for installed headers
1288 export INSTALL_HDR_PATH = $(objtree)/usr
1290 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1291 cmd_headers_install = \
1292 mkdir -p $(INSTALL_HDR_PATH); \
1293 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1294 usr/include $(INSTALL_HDR_PATH)
1296 PHONY += headers_install
1297 headers_install: headers
1298 $(call cmd,headers_install)
1300 PHONY += archheaders archscripts
1302 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1305 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1306 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1307 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1308 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1310 ifdef CONFIG_HEADERS_INSTALL
1314 PHONY += scripts_unifdef
1315 scripts_unifdef: scripts_basic
1316 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1318 # ---------------------------------------------------------------------------
1321 # Many distributions have the custom install script, /sbin/installkernel.
1322 # If DKMS is installed, 'make install' will eventually recurse back
1323 # to this Makefile to build and install external modules.
1324 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1326 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1327 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1329 # ---------------------------------------------------------------------------
1332 PHONY += vdso_install
1333 vdso_install: export INSTALL_FILES = $(vdso-install-y)
1335 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
1337 # ---------------------------------------------------------------------------
1340 ifdef CONFIG_OBJTOOL
1341 prepare: tools/objtool
1345 ifdef CONFIG_DEBUG_INFO_BTF
1346 prepare: tools/bpf/resolve_btfids
1350 # The tools build system is not a part of Kbuild and tends to introduce
1351 # its own unique issues. If you need to integrate a new tool into Kbuild,
1352 # please consider locating that tool outside the tools/ tree and using the
1353 # standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry
1354 # here. See Documentation/kbuild/makefiles.rst for details.
1356 PHONY += resolve_btfids_clean
1358 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1360 # tools/bpf/resolve_btfids directory might not exist
1361 # in output directory, skip its clean in that case
1362 resolve_btfids_clean:
1363 ifneq ($(wildcard $(resolve_btfids_O)),)
1364 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1367 # Clear a bunch of variables before executing the submake
1368 ifeq ($(quiet),silent_)
1373 $(Q)mkdir -p $(objtree)/tools
1374 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1377 $(Q)mkdir -p $(objtree)/tools
1378 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1380 # ---------------------------------------------------------------------------
1385 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1387 kselftest-%: headers FORCE
1388 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1390 PHONY += kselftest-merge
1392 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1393 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1394 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1395 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1397 # ---------------------------------------------------------------------------
1400 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1401 dtstree := arch/$(SRCARCH)/boot/dts
1407 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1409 %.dtbo: dtbs_prepare
1410 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1412 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1414 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1
1416 # include/config/kernel.release is actually needed when installing DTBs because
1417 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1418 # dtbs_install depend on it as dtbs_install may run as root.
1419 dtbs_prepare: include/config/kernel.release scripts_dtc
1421 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1425 ifneq ($(CHECK_DTBS),)
1426 dtbs_prepare: dt_binding_schemas
1432 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree)
1434 ifdef CONFIG_OF_EARLY_FLATTREE
1440 PHONY += scripts_dtc
1441 scripts_dtc: scripts_basic
1442 $(Q)$(MAKE) $(build)=scripts/dtc
1444 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1448 PHONY += dt_binding_check dt_binding_schemas
1449 dt_binding_check: dt_binding_schemas scripts_dtc
1450 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1453 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1455 PHONY += dt_compatible_check
1456 dt_compatible_check: dt_binding_schemas
1457 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1459 # ---------------------------------------------------------------------------
1462 ifdef CONFIG_MODULES
1464 # By default, build modules as well
1468 # When we're building modules with modversions, we need to consider
1469 # the built-in objects during the descend as well, in order to
1470 # make sure the checksums are up to date before we record them.
1471 ifdef CONFIG_MODVERSIONS
1478 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1480 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1485 modules: modules_prepare
1487 # Target to prepare building external modules
1488 modules_prepare: prepare
1489 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1491 endif # CONFIG_MODULES
1494 # Cleaning is done on three levels.
1495 # make clean Delete most generated files
1496 # Leave enough to build external modules
1497 # make mrproper Delete the current configuration, and all generated files
1498 # make distclean Remove editor backup files, patch leftover files and the like
1500 # Directories & files removed with 'make clean'
1501 CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1502 modules.builtin modules.builtin.modinfo modules.nsdeps \
1503 modules.builtin.ranges vmlinux.o.map \
1504 compile_commands.json rust/test \
1505 rust-project.json .vmlinux.objs .vmlinux.export.c
1507 # Directories & files removed with 'make mrproper'
1508 MRPROPER_FILES += include/config include/generated \
1509 arch/$(SRCARCH)/include/generated .objdiff \
1510 debian snap tar-install PKGBUILD pacman \
1511 .config .config.old .version \
1513 certs/signing_key.pem \
1519 # clean - Delete most, but leave enough to build external modules
1521 clean: private rm-files := $(CLEAN_FILES)
1523 PHONY += archclean vmlinuxclean
1526 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1527 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1529 clean: archclean vmlinuxclean resolve_btfids_clean
1531 # mrproper - Delete all generated files, including .config
1533 mrproper: private rm-files := $(MRPROPER_FILES)
1534 mrproper-dirs := $(addprefix _mrproper_,scripts)
1536 PHONY += $(mrproper-dirs) mrproper
1538 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1540 mrproper: clean $(mrproper-dirs)
1542 @find . $(RCS_FIND_IGNORE) \
1543 \( -name '*.rmeta' \) \
1544 -type f -print | xargs rm -f
1551 @find . $(RCS_FIND_IGNORE) \
1552 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1553 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1554 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1555 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1556 -type f -print | xargs rm -f
1559 # Packaging of the kernel to various formats
1560 # ---------------------------------------------------------------------------
1563 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1564 %pkg: include/config/kernel.release FORCE
1565 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1567 # Brief documentation of the typical targets used
1568 # ---------------------------------------------------------------------------
1570 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1571 boards := $(sort $(notdir $(boards)))
1572 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1573 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1577 @echo 'Cleaning targets:'
1578 @echo ' clean - Remove most generated files but keep the config and'
1579 @echo ' enough build support to build external modules'
1580 @echo ' mrproper - Remove all generated files + config + various backup files'
1581 @echo ' distclean - mrproper + remove editor backup and patch files'
1583 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1585 @echo 'Other generic targets:'
1586 @echo ' all - Build all targets marked with [*]'
1587 @echo '* vmlinux - Build the bare kernel'
1588 @echo '* modules - Build all modules'
1589 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1590 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1591 @echo ' dir/ - Build all files in dir and below'
1592 @echo ' dir/file.[ois] - Build specified target only'
1593 @echo ' dir/file.ll - Build the LLVM assembly file'
1594 @echo ' (requires compiler support for LLVM assembly generation)'
1595 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1596 @echo ' (requires a recent binutils and recent build (System.map))'
1597 @echo ' dir/file.ko - Build module including final link'
1598 @echo ' modules_prepare - Set up for building external modules'
1599 @echo ' tags/TAGS - Generate tags file for editors'
1600 @echo ' cscope - Generate cscope index'
1601 @echo ' gtags - Generate GNU GLOBAL index'
1602 @echo ' kernelrelease - Output the release version string (use with make -s)'
1603 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1604 @echo ' image_name - Output the image name (use with make -s)'
1605 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1606 echo ' (default: $(INSTALL_HDR_PATH))'; \
1608 @echo 'Static analysers:'
1609 @echo ' checkstack - Generate a list of stack hogs and consider all functions'
1610 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)'
1611 @echo ' versioncheck - Sanity check on version.h usage'
1612 @echo ' includecheck - Check for duplicate included header files'
1613 @echo ' headerdep - Detect inclusion cycles in headers'
1614 @echo ' coccicheck - Check with Coccinelle'
1615 @echo ' clang-analyzer - Check with clang static analyzer'
1616 @echo ' clang-tidy - Check with clang-tidy'
1619 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1621 @echo 'Kernel selftest:'
1622 @echo ' kselftest - Build and run kernel selftest'
1623 @echo ' Build, install, and boot kernel before'
1624 @echo ' running kselftest on it'
1625 @echo ' Run as root for full coverage'
1626 @echo ' kselftest-all - Build kernel selftest'
1627 @echo ' kselftest-install - Build and install kernel selftest'
1628 @echo ' kselftest-clean - Remove all generated kselftest files'
1629 @echo ' kselftest-merge - Merge all the config dependencies of'
1630 @echo ' kselftest to existing .config.'
1632 @echo 'Rust targets:'
1633 @echo ' rustavailable - Checks whether the Rust toolchain is'
1634 @echo ' available and, if not, explains why.'
1635 @echo ' rustfmt - Reformat all the Rust code in the kernel'
1636 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel'
1637 @echo ' is formatted, printing a diff otherwise.'
1638 @echo ' rustdoc - Generate Rust documentation'
1639 @echo ' (requires kernel .config)'
1640 @echo ' rusttest - Runs the Rust tests'
1641 @echo ' (requires kernel .config; downloads external repos)'
1642 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1643 @echo ' (requires kernel .config)'
1644 @echo ' dir/file.[os] - Build specified target only'
1645 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1646 @echo ' Run with RUSTFMT=n to skip reformatting if needed.'
1647 @echo ' The output is not intended to be compilable.'
1648 @echo ' dir/file.ll - Build the LLVM assembly file'
1651 echo 'Devicetree:'; \
1652 echo '* dtbs - Build device tree blobs for enabled boards'; \
1653 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1654 echo ' dt_binding_check - Validate device tree binding documents and examples'; \
1655 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \
1656 echo ' dtbs_check - Validate device tree source files';\
1659 @echo 'Userspace tools targets:'
1660 @echo ' use "make tools/help"'
1661 @echo ' or "cd tools; make help"'
1663 @echo 'Kernel packaging:'
1664 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1666 @echo 'Documentation targets:'
1667 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1669 @echo 'Architecture-specific targets ($(SRCARCH)):'
1671 echo ' No architecture-specific help defined for $(SRCARCH)')
1674 $(foreach b, $(boards), \
1675 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1677 @$(if $(board-dirs), \
1678 $(foreach b, $(board-dirs), \
1679 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1680 printf " %-16s - Show all of the above\\n" help-boards; \
1683 @echo ' make V=n [targets] 1: verbose build'
1684 @echo ' 2: give reason for rebuild of target'
1685 @echo ' V=1 and V=2 can be combined with V=12'
1686 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1687 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1688 @echo ' (sparse by default)'
1689 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1690 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1691 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where'
1692 @echo ' 1: warnings which may be relevant and do not occur too often'
1693 @echo ' 2: warnings which occur quite often but may still be relevant'
1694 @echo ' 3: more obscure warnings, can most likely be ignored'
1695 @echo ' c: extra checks in the configuration stage (Kconfig)'
1696 @echo ' e: warnings are being treated as errors'
1697 @echo ' Multiple levels can be combined with W=12 or W=123'
1699 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1700 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1703 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1704 @echo 'For further info see the ./README file'
1707 help-board-dirs := $(addprefix help-,$(board-dirs))
1709 help-boards: $(help-board-dirs)
1711 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1713 $(help-board-dirs): help-%:
1714 @echo 'Architecture-specific targets ($(SRCARCH) $*):'
1715 @$(if $(boards-per-dir), \
1716 $(foreach b, $(boards-per-dir), \
1717 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1721 # Documentation targets
1722 # ---------------------------------------------------------------------------
1723 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1724 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1725 PHONY += $(DOC_TARGETS)
1727 $(Q)$(MAKE) $(build)=Documentation $@
1731 # ---------------------------------------------------------------------------
1733 # "Is Rust available?" target
1734 PHONY += rustavailable
1736 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1738 # Documentation target
1740 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1743 $(Q)$(MAKE) $(build)=rust $@
1748 $(Q)$(MAKE) $(build)=rust $@
1750 # Formatting targets
1751 PHONY += rustfmt rustfmtcheck
1753 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1755 # We match using absolute paths since `find` does not resolve them
1756 # when matching, which is a problem when e.g. `srctree` is `..`.
1757 # We `grep` afterwards in order to remove the directory entry itself.
1759 $(Q)find $(abs_srctree) -type f -name '*.rs' \
1760 -o -path $(abs_srctree)/rust/alloc -prune \
1761 -o -path $(abs_objtree)/rust/test -prune \
1762 | grep -Fv $(abs_srctree)/rust/alloc \
1763 | grep -Fv $(abs_objtree)/rust/test \
1764 | grep -Fv generated \
1765 | xargs $(RUSTFMT) $(rustfmt_flags)
1767 rustfmtcheck: rustfmt_flags = --check
1768 rustfmtcheck: rustfmt
1771 # ---------------------------------------------------------------------------
1775 $(Q)$(srctree)/scripts/misc-check
1779 PHONY += scripts_gdb
1780 scripts_gdb: prepare0
1781 $(Q)$(MAKE) $(build)=scripts/gdb
1782 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1784 ifdef CONFIG_GDB_SCRIPTS
1788 else # KBUILD_EXTMOD
1790 filechk_kernel.release = echo $(KERNELRELEASE)
1793 # External module support.
1794 # When building external modules the kernel used as basis is considered
1795 # read-only, and no consistency checks are made and the make
1796 # system is not used on the basis kernel. If updates are required
1797 # in the basis kernel ordinary make commands (without M=...) must be used.
1799 # We are always building only modules.
1803 build-dir := $(KBUILD_EXTMOD)
1805 compile_commands.json: $(extmod_prefix)compile_commands.json
1806 PHONY += compile_commands.json
1808 clean-dirs := $(KBUILD_EXTMOD)
1809 clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1810 $(KBUILD_EXTMOD)/compile_commands.json
1813 # now expand this into a simple variable to reduce the cost of shell evaluations
1814 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1816 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1817 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1818 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1819 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1824 @echo ' Building external modules.'
1825 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1827 @echo ' modules - default target, build the module(s)'
1828 @echo ' modules_install - install the module'
1829 @echo ' clean - remove generated files in module directory only'
1830 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file'
1833 ifndef CONFIG_MODULES
1834 modules modules_install: __external_modules_error
1835 __external_modules_error:
1837 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1838 @echo >&2 '*** You cannot build or install external modules.'
1843 endif # KBUILD_EXTMOD
1845 # ---------------------------------------------------------------------------
1848 PHONY += modules modules_install modules_sign modules_prepare
1851 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1852 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1854 ifeq ($(CONFIG_MODULE_SIG),y)
1855 # modules_sign is a subset of modules_install.
1856 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1857 modules_sign: modules_install
1862 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1867 ifdef CONFIG_MODULES
1869 $(MODORDER): $(build-dir)
1872 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1873 # This is solely useful to speed up test compiles.
1875 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1876 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1879 PHONY += modules_check
1880 modules_check: $(MODORDER)
1881 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1883 else # CONFIG_MODULES
1890 endif # CONFIG_MODULES
1893 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1894 $(if $(KBUILD_MODULES), modules_check)
1895 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1898 # ---------------------------------------------------------------------------
1899 # To build individual files in subdirectories, you can do like this:
1901 # make foo/bar/baz.s
1903 # The supported suffixes for single-target are listed in 'single-targets'
1905 # To build only under specific subdirectories, you can do like this:
1911 # .ko is special because modpost is needed
1912 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1913 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1914 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1916 $(single-ko): single_modules
1918 $(single-no-ko): $(build-dir)
1921 # Remove MODORDER when done because it is not the real one.
1922 PHONY += single_modules
1923 single_modules: $(single-no-ko) modules_prepare
1924 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
1925 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1926 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1927 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1929 $(Q)rm -f $(MODORDER)
1931 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1937 # Preset locale variables to speed up the build process. Limit locale
1938 # tweaks to this spot to avoid wrong language settings when running
1939 # make menuconfig etc.
1940 # Error messages still appears in the original language
1941 PHONY += $(build-dir)
1942 $(build-dir): prepare
1943 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
1945 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1946 PHONY += $(clean-dirs) clean
1948 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1950 clean: $(clean-dirs)
1952 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1953 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
1955 -o -name '*.dtb' -o -name '*.dtbo' \
1956 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
1957 -o -name '*.dt.yaml' -o -name 'dtbs-list' \
1958 -o -name '*.dwo' -o -name '*.lst' \
1959 -o -name '*.su' -o -name '*.mod' \
1960 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1961 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1962 -o -name '*.asn1.[ch]' \
1963 -o -name '*.symtypes' -o -name 'modules.order' \
1964 -o -name '*.c.[012]*.*' \
1968 -o -name '.tmp_*' -print \
1971 # Generate tags for editors
1972 # ---------------------------------------------------------------------------
1973 quiet_cmd_tags = GEN $@
1974 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1976 tags TAGS cscope gtags: FORCE
1979 # Generate rust-project.json (a file that describes the structure of non-Cargo
1980 # Rust projects) for rust-analyzer (an implementation of the Language Server
1982 PHONY += rust-analyzer
1984 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1985 $(Q)$(MAKE) $(build)=rust $@
1987 # Script to generate missing namespace dependencies
1988 # ---------------------------------------------------------------------------
1991 nsdeps: export KBUILD_NSDEPS=1
1993 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1996 # ---------------------------------------------------------------------------
1998 quiet_cmd_gen_compile_commands = GEN $@
1999 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2001 $(extmod_prefix)compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \
2002 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2003 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
2004 $(call if_changed,gen_compile_commands)
2006 targets += $(extmod_prefix)compile_commands.json
2008 PHONY += clang-tidy clang-analyzer
2010 ifdef CONFIG_CC_IS_CLANG
2011 quiet_cmd_clang_tools = CHECK $<
2012 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2014 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
2015 $(call cmd,clang_tools)
2017 clang-tidy clang-analyzer:
2018 @echo "$@ requires CC=clang" >&2
2022 # Scripts to check various things for consistency
2023 # ---------------------------------------------------------------------------
2025 PHONY += includecheck versioncheck coccicheck
2028 find $(srctree)/* $(RCS_FIND_IGNORE) \
2029 -name '*.[hcS]' -type f -print | sort \
2030 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2033 find $(srctree)/* $(RCS_FIND_IGNORE) \
2034 -name '*.[hcS]' -type f -print | sort \
2035 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2038 $(Q)$(BASH) $(srctree)/scripts/$@
2040 PHONY += checkstack kernelrelease kernelversion image_name
2042 # UML needs a little special treatment here. It wants to use the host
2043 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2044 # else wants $(ARCH), including people doing cross-builds, which means
2045 # that $(SUBARCH) doesn't work here.
2047 CHECKSTACK_ARCH := $(SUBARCH)
2049 CHECKSTACK_ARCH := $(ARCH)
2053 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2054 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE)
2057 @$(filechk_kernel.release)
2060 @echo $(KERNELVERSION)
2063 @echo $(KBUILD_IMAGE)
2065 PHONY += run-command
2067 $(Q)$(KBUILD_RUN_COMMAND)
2069 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2070 cmd_rmfiles = rm -rf $(rm-files)
2072 # read saved command lines for existing targets
2073 existing-targets := $(wildcard $(sort $(targets)))
2075 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2077 endif # config-build
2079 endif # need-sub-make
2084 # Declare the contents of the PHONY variable as phony. We keep that
2085 # information in a variable so we can use it in if_changed and friends.