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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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# Finds the multi-part object the current object will be linked into.# If the object belongs to two or more multi-part objects, list them all.modname-multi = $(sort $(foreach m,$(multi-obj-ym),\ $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))
__modname = $(or $(modname-multi),$(basetarget))
modname = $(subst $(space),:,$(__modname))modfile = $(addprefix $(obj)/,$(__modname))
# target with $(obj)/ and its suffix strippedtarget-stem = $(basename $(patsubst $(obj)/%,%,$@))
# These flags are needed for modversions and compiling, so we define them here# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will# end up in (or would, if it gets compiled in)name-fix-token = $(subst $(comma),_,$(subst -,_,$1))name-fix = $(call stringify,$(call name-fix-token,$1))basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \ -D__KBUILD_MODNAME=$(call name-fix-token,$(modname))modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \ $(filter-out $(ccflags-remove-y), \ $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \ $(CFLAGS_$(target-stem).o))_rust_flags = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \ $(filter-out $(rustflags-remove-y), \ $(KBUILD_RUSTFLAGS) $(rustflags-y)) \ $(RUSTFLAGS_$(target-stem).o))_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \ $(filter-out $(asflags-remove-y), \ $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \ $(AFLAGS_$(target-stem).o))_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
## Enable gcov profiling flags for a file, directory or for all files depending# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL# (in this order)#ifeq ($(CONFIG_GCOV_KERNEL),y)_c_flags += $(if $(patsubst n%,, \ $(GCOV_PROFILE_$(target-stem).o)$(GCOV_PROFILE)$(if $(is-kernel-object),$(CONFIG_GCOV_PROFILE_ALL))), \ $(CFLAGS_GCOV))endif
## Enable address sanitizer flags for kernel except some files or directories# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)#ifeq ($(CONFIG_KASAN),y)ifneq ($(CONFIG_KASAN_HW_TAGS),y)_c_flags += $(if $(patsubst n%,, \ $(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \ $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))_rust_flags += $(if $(patsubst n%,, \ $(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \ $(RUSTFLAGS_KASAN))endifendif
ifeq ($(CONFIG_KMSAN),y)_c_flags += $(if $(patsubst n%,, \ $(KMSAN_SANITIZE_$(target-stem).o)$(KMSAN_SANITIZE)$(is-kernel-object)), \ $(CFLAGS_KMSAN))_c_flags += $(if $(patsubst n%,, \ $(KMSAN_ENABLE_CHECKS_$(target-stem).o)$(KMSAN_ENABLE_CHECKS)$(is-kernel-object)), \ , -mllvm -msan-disable-checks=1)endif
ifeq ($(CONFIG_UBSAN),y)_c_flags += $(if $(patsubst n%,, \ $(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_SANITIZE)$(is-kernel-object)), \ $(CFLAGS_UBSAN))_c_flags += $(if $(patsubst n%,, \ $(UBSAN_INTEGER_WRAP_$(target-stem).o)$(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_INTEGER_WRAP)$(UBSAN_SANITIZE)$(is-kernel-object)), \ $(CFLAGS_UBSAN_INTEGER_WRAP))endif
ifeq ($(CONFIG_KCOV),y)_c_flags += $(if $(patsubst n%,, \ $(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \ $(CFLAGS_KCOV))_rust_flags += $(if $(patsubst n%,, \ $(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \ $(RUSTFLAGS_KCOV))endif
## Enable KCSAN flags except some files or directories we don't want to check# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)#ifeq ($(CONFIG_KCSAN),y)_c_flags += $(if $(patsubst n%,, \ $(KCSAN_SANITIZE_$(target-stem).o)$(KCSAN_SANITIZE)$(is-kernel-object)), \ $(CFLAGS_KCSAN))# Some uninstrumented files provide implied barriers required to avoid false# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only._c_flags += $(if $(patsubst n%,, \ $(KCSAN_INSTRUMENT_BARRIERS_$(target-stem).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \ -D__KCSAN_INSTRUMENT_BARRIERS__)endif
## Enable context analysis flags only where explicitly opted in.# (depends on variables CONTEXT_ANALYSIS_obj.o, CONTEXT_ANALYSIS)#ifeq ($(CONFIG_WARN_CONTEXT_ANALYSIS),y)_c_flags += $(if $(patsubst n%,, \ $(CONTEXT_ANALYSIS_$(target-stem).o)$(CONTEXT_ANALYSIS)$(if $(is-kernel-object),$(CONFIG_WARN_CONTEXT_ANALYSIS_ALL))), \ $(CFLAGS_CONTEXT_ANALYSIS))endif
## Enable AutoFDO build flags except some files or directories we don't want to# enable (depends on variables AUTOFDO_PROFILE_obj.o and AUTOFDO_PROFILE).#ifeq ($(CONFIG_AUTOFDO_CLANG),y)_c_flags += $(if $(patsubst n%,, \ $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(is-kernel-object)), \ $(CFLAGS_AUTOFDO_CLANG))_rust_flags += $(if $(patsubst n%,, \ $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(is-kernel-object)), \ $(RUSTFLAGS_AUTOFDO_CLANG))endif
## Enable Propeller build flags except some files or directories we don't want to# enable (depends on variables AUTOFDO_PROPELLER_obj.o and PROPELLER_PROFILE).#ifdef CONFIG_PROPELLER_CLANG_c_flags += $(if $(patsubst n%,, \ $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(PROPELLER_PROFILE))$(is-kernel-object), \ $(CFLAGS_PROPELLER_CLANG))endif
# $(src) for including checkin headers from generated source files# $(obj) for including generated headers from checkin source filesifdef building_out_of_srctree_c_flags += $(addprefix -I, $(src) $(obj))_a_flags += $(addprefix -I, $(src) $(obj))_cpp_flags += $(addprefix -I, $(src) $(obj))endif
# If $(is-kernel-object) is 'y', this object will be linked to vmlinux or modulesis-kernel-object = $(or $(part-of-builtin),$(part-of-module))
part-of-builtin = $(if $(filter $(basename $@).o, $(real-obj-y) $(lib-y)),y)part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)quiet_modtag = $(if $(part-of-module),[M], )
modkern_cflags = \ $(if $(part-of-module), \ $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
modkern_rustflags = \ $(if $(part-of-module), \ $(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \ $(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL))
modkern_aflags = $(if $(part-of-module), \ $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \ $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) $(modfile_flags))
c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ -include $(srctree)/include/linux/compiler_types.h \ $(_c_flags) $(modkern_cflags) \ $(basename_flags) $(modname_flags)
rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg
a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ $(_a_flags) $(modkern_aflags) $(modname_flags)
cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ $(_cpp_flags)
ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
ifdef CONFIG_OBJTOOL
objtool := $(objtree)/tools/objtool/objtool
objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_labelobjtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstrobjtool-args-$(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) += --hacks=skylakeobjtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibtobjtool-args-$(CONFIG_CALL_PADDING) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES)ifdef CONFIG_CALL_PADDINGobjtool-args-$(CONFIG_CFI) += --cfiobjtool-args-$(CONFIG_FINEIBT) += --fineibtendifobjtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcountifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOLobjtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnopendifobjtool-args-$(CONFIG_UNWINDER_ORC) += --orcobjtool-args-$(CONFIG_MITIGATION_RETPOLINE) += --retpolineobjtool-args-$(CONFIG_MITIGATION_RETHUNK) += --rethunkobjtool-args-$(CONFIG_MITIGATION_SLS) += --slsobjtool-args-$(CONFIG_STACK_VALIDATION) += --stackvalobjtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-callobjtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccessobjtool-args-$(or $(CONFIG_GCOV_KERNEL),$(CONFIG_KCOV)) += --no-unreachableobjtool-args-$(CONFIG_OBJTOOL_WERROR) += --werror
objtool-args = $(objtool-args-y) \ $(if $(delay-objtool), --link) \ $(if $(part-of-module), --module)
delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT),$(CONFIG_KLP_BUILD))
cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@)cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
objtool-enabled := y
endif # CONFIG_OBJTOOL
# Useful for describing the dependency of composite objects# Usage:# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)define multi_depend$(foreach m, $1, \ $(eval $m: \ $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3))))endef
# Remove ".." and "." from a path, without using "realpath"# Usage:# $(call normalize_path,path/to/../file)define normalize_path$(strip $(eval elements :=) \$(foreach elem,$(subst /, ,$1), \ $(if $(filter-out .,$(elem)), \ $(if $(filter ..,$(elem)), \ $(eval elements := $(wordlist 2,$(words $(elements)),x $(elements))), \ $(eval elements := $(elements) $(elem))))) \$(subst $(space),/,$(elements)))endef
# Build commands# ===========================================================================# These are shared by some Makefile.* files.
ifdef CONFIG_LTO_CLANG# Run $(LD) here to convert LLVM IR to ELF in the following cases:# - when this object needs objtool processing, as objtool cannot process LLVM IR# - when this is a single-object module, as modpost cannot process LLVM IRcmd_ld_single = $(if $(objtool-enabled)$(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@)endif
ifdef CONFIG_LTO_CLANG_THIN_DIST# Save the _c_flags, sliently.quiet_cmd_save_c_flags = saved_c_flags = $(_c_flags) $(modkern_cflags) cmd_save_c_flags = printf '\n%s\n' 'saved_c_flags_$@ := $(call escsq,$(saved_c_flags))' >> $(dot-target).cmdendif
quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \ $(cmd_ld_single) \ $(cmd_objtool)
define rule_cc_o_c $(call cmd_and_fixdep,cc_o_c) $(call cmd,save_c_flags) $(call cmd,checksrc) $(call cmd,checkdoc) $(call cmd,gen_objtooldep) $(call cmd,gen_symversions_c) $(call cmd,record_mcount) $(call cmd,warn_shared_object)endef
quiet_cmd_as_o_S = AS $(quiet_modtag) $@ cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)
define rule_as_o_S $(call cmd_and_fixdep,as_o_S) $(call cmd,gen_objtooldep) $(call cmd,gen_symversions_S) $(call cmd,warn_shared_object)endef
# Copy a file# ===========================================================================# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,# the copy would be read-only as well, leading to an error when executing the# rule next time. Use 'cat' instead in order to generate a writable file.quiet_cmd_copy = COPY $@ cmd_copy = cat $< > $@
$(obj)/%: $(src)/%_shipped $(call cmd,copy)
# Touch a file# ===========================================================================quiet_cmd_touch = TOUCH $(call normalize_path,$@) cmd_touch = touch $@
# Commands useful for building a boot image# ===========================================================================## Use as following:## target: source(s) FORCE# $(if_changed,ld/objcopy/gzip)## and add target to 'targets' so that we know we have to# read in the saved command line
# Linking# ---------------------------------------------------------------------------
quiet_cmd_ld = LD $@ cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
# Archive# ---------------------------------------------------------------------------
quiet_cmd_ar = AR $@ cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
# Objcopy# ---------------------------------------------------------------------------
quiet_cmd_objcopy = OBJCOPY $@cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
# Gzip# ---------------------------------------------------------------------------
quiet_cmd_gzip = GZIP $@ cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
# Bzip2# ---------------------------------------------------------------------------
# Bzip2 and LZMA do not include size in file... so we have to fake that;# append the size as a 32-bit littleendian number as gzip does.size_append = printf $(shell \dec_size=0; \for F in $(real-prereqs); do \ fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ dec_size=$$(expr $$dec_size + $$fsize); \done; \printf "%08x\n" $$dec_size | \ sed 's/\(..\)/\1 /g' | { \ read ch0 ch1 ch2 ch3; \ for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ printf '%s%03o' '\\' $$((0x$$ch)); \ done; \ } \)
quiet_cmd_file_size = GEN $@ cmd_file_size = $(size_append) > $@
quiet_cmd_bzip2 = BZIP2 $@ cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@
quiet_cmd_bzip2_with_size = BZIP2 $@ cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
# Lzma# ---------------------------------------------------------------------------
quiet_cmd_lzma = LZMA $@ cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@
quiet_cmd_lzma_with_size = LZMA $@ cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
quiet_cmd_lzo = LZO $@ cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@
quiet_cmd_lzo_with_size = LZO $@ cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
quiet_cmd_lz4 = LZ4 $@ cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -9 - - > $@
quiet_cmd_lz4_with_size = LZ4 $@ cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -9 - -; \ $(size_append); } > $@
# U-Boot mkimage# ---------------------------------------------------------------------------
MKIMAGE := $(srctree)/scripts/mkuboot.sh
# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces# the number of overrides in arch makefilesUIMAGE_ARCH ?= $(SRCARCH)UIMAGE_COMPRESSION ?= $(or $(2),none)UIMAGE_OPTS-y ?=UIMAGE_TYPE ?= kernelUIMAGE_LOADADDR ?= arch_must_set_thisUIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)UIMAGE_NAME ?= Linux-$(KERNELRELEASE)
quiet_cmd_uimage = UIMAGE $@ cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ -T $(UIMAGE_TYPE) \ -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ -n '$(UIMAGE_NAME)' -d $< $@
# Flat Image Tree (FIT)# This allows for packaging of a kernel and all devicetrees files, using# compression.# ---------------------------------------------------------------------------
MAKE_FIT := $(srctree)/scripts/make_fit.py
# Use this to override the compression algorithmFIT_COMPRESSION ?= gzip
quiet_cmd_fit = FIT $@ cmd_fit = $(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \ --name '$(UIMAGE_NAME)' $(FIT_EXTRA_ARGS) \ $(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \ $(if $(FIT_DECOMPOSE_DTBS),--decompose-dtbs) \ --compress $(FIT_COMPRESSION) -k $< @$(word 2,$^)
# XZ# ---------------------------------------------------------------------------# Use xzkern or xzkern_with_size to compress the kernel image and xzmisc to# compress other things.## xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage# of the kernel decompressor. A BCJ filter is used if it is available for# the target architecture.## xzkern_with_size also appends uncompressed size of the data using# size_append. The .xz format has the size information available at the end# of the file too, but it's in more complex format and it's good to avoid# changing the part of the boot code that reads the uncompressed size.# Note that the bytes added by size_append will make the xz tool think that# the file is corrupt. This is expected.## xzmisc doesn't use size_append, so it can be used to create normal .xz# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very# big dictionary would increase the memory usage too much in the multi-call# decompression mode. A BCJ filter isn't used either.quiet_cmd_xzkern = XZKERN $@ cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@
quiet_cmd_xzkern_with_size = XZKERN $@ cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \ $(size_append); } > $@
quiet_cmd_xzmisc = XZMISC $@ cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
# ZSTD# ---------------------------------------------------------------------------# Appends the uncompressed size of the data using size_append. The .zst# format has the size information available at the beginning of the file too,# but it's in a more complex format and it's good to avoid changing the part# of the boot code that reads the uncompressed size.## Note that the bytes added by size_append will make the zstd tool think that# the file is corrupt. This is expected.## zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of# 128 MB. zstd22 is used for kernel compression because it is decompressed in a# single pass, so zstd doesn't need to allocate a window buffer. When streaming# decompression is used, like initramfs decompression, zstd22 should likely not# be used because it would require zstd to allocate a 128 MB buffer.
quiet_cmd_zstd = ZSTD $@ cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@
quiet_cmd_zstd22 = ZSTD22 $@ cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@
quiet_cmd_zstd22_with_size = ZSTD22 $@ cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
# ASM offsets# ---------------------------------------------------------------------------
# Default sed regexp - multiline due to syntax constraints## Use [:space:] because LLVM's integrated assembler inserts <tab> around# the .ascii directive whereas GCC keeps the <space> as-is.define sed-offsets 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ /^->/{s:->#\(.*\):/* \1 */:; \ s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ s:->::; p;}'endef
# Use filechk to avoid rebuilds when a header changes, but the resulting file# does notdefine filechk_offsets echo "#ifndef $2"; \ echo "#define $2"; \ echo "/*"; \ echo " * DO NOT MODIFY."; \ echo " *"; \ echo " * This file was generated by Kbuild"; \ echo " */"; \ echo ""; \ sed -ne $(sed-offsets) < $<; \ echo ""; \ echo "#endif"endef