# SPDX-License-Identifier: GPL-2.0# Backward compatibilityasflags-y  += $(EXTRA_AFLAGS)ccflags-y  += $(EXTRA_CFLAGS)cppflags-y += $(EXTRA_CPPFLAGS)ldflags-y  += $(EXTRA_LDFLAGS) # flags that take effect in current and sub directoriesKBUILD_AFLAGS += $(subdir-asflags-y)KBUILD_CFLAGS += $(subdir-ccflags-y)KBUILD_RUSTFLAGS += $(subdir-rustflags-y) # Figure out what we need to build from the various variables# =========================================================================== # When an object is listed to be built compiled-in and modular,# only build the compiled-in versionobj-m := $(filter-out $(obj-y),$(obj-m)) # Libraries are always collected in one lib file.# Filter out objects already built-inlib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) # Subdirectories we need to descend intosubdir-ym := $(sort $(subdir-y) $(subdir-m) \			$(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m)))) # Handle objects in subdirs:# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and#   foo/modules.order# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order## Generate modules.order to determine modorder. Unfortunately, we don't have# information about ordering between -y and -m subdirs. Just put -y's first. ifdef need-modorderobj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))elseobj-m := $(filter-out %/, $(obj-m))endif ifdef need-builtinobj-y		:= $(patsubst %/, %/built-in.a, $(obj-y))elseobj-y		:= $(filter-out %/, $(obj-y))endif # Expand $(foo-objs) $(foo-y) etc. by replacing their individualssuffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s))))# List composite targets that are constructed by combining other targetsmulti-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m)))# List primitive targets that are compiled from source filesreal-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m)) # If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite objectmulti-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)multi-obj-ym := $(multi-obj-y) $(multi-obj-m) # Replace multi-part objects by their individual parts,# including built-in.a from subdirectoriesreal-obj-y := $(call real-search, $(obj-y), .o, -objs -y)real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m) always-y += $(always-m) # hostprogs-always-y += foo# ... is a shorthand for# hostprogs += foo# always-y  += foohostprogs += $(hostprogs-always-y) $(hostprogs-always-m)always-y += $(hostprogs-always-y) $(hostprogs-always-m) # userprogs-always-y is likewise.userprogs += $(userprogs-always-y) $(userprogs-always-m)always-y += $(userprogs-always-y) $(userprogs-always-m) # Add subdir path ifneq ($(obj),.)extra-y		:= $(addprefix $(obj)/,$(extra-y))always-y	:= $(addprefix $(obj)/,$(always-y))targets		:= $(addprefix $(obj)/,$(targets))obj-m		:= $(addprefix $(obj)/,$(obj-m))lib-y		:= $(addprefix $(obj)/,$(lib-y))real-obj-y	:= $(addprefix $(obj)/,$(real-obj-y))real-obj-m	:= $(addprefix $(obj)/,$(real-obj-m))multi-obj-m	:= $(addprefix $(obj)/, $(multi-obj-m))subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym))endif # 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,$(modname)) \		 -D__KBUILD_MODNAME=kmod_$(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%,, \		$(UBSAN_SIGNED_WRAP_$(target-stem).o)$(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_SIGNED_WRAP)$(UBSAN_SANITIZE)$(is-kernel-object)), \		$(CFLAGS_UBSAN_SIGNED_WRAP))endif ifeq ($(CONFIG_KCOV),y)_c_flags += $(if $(patsubst n%,, \	$(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \	$(CFLAGS_KCOV))endif ## Enable KCSAN flags except some files or directories we don't want to check# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)#ifeq ($(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)$(KCSAN_INSTRUMENT_BARRIERS)n), \	-D__KCSAN_INSTRUMENT_BARRIERS__)endif ## Enable AutoFDO build flags except some files or directories we don't want to# enable (depends on variables AUTOFDO_PROFILE_obj.o and AUTOFDO_PROFILE).#ifeq ($(CONFIG_AUTOFDO_CLANG),y)_c_flags += $(if $(patsubst n%,, \	$(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(is-kernel-object)), \	$(CFLAGS_AUTOFDO_CLANG))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_FINEIBT)				+= --cfiobjtool-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-$(CONFIG_HAVE_UACCESS_VALIDATION)		+= --uaccessobjtool-args-$(CONFIG_GCOV_KERNEL)			+= --no-unreachableobjtool-args-$(CONFIG_PREFIX_SYMBOLS)			+= --prefix=$(CONFIG_FUNCTION_PADDING_BYTES) objtool-args = $(objtool-args-y)					\	$(if $(delay-objtool), --link)					\	$(if $(part-of-module), --module) delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT)) 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 # Build commands# ===========================================================================# These are shared by some Makefile.* files. ifdef CONFIG_LTO_CLANG# Run $(LD) here to covert 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 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,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) # 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)) $< $@ quiet_cmd_strip_relocs = RSTRIP  $@cmd_strip_relocs = $(OBJCOPY) --remove-section='.rel*' $@ # 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)' \		$(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 > $@ 

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