# 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) # 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) $(userprogs-always-m) # DTB# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are builtdtb-$(CONFIG_OF_ALL_DTBS)       += $(dtb-) # Composite DTB (i.e. DTB constructed by overlay)multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)# Primitive DTB compiled from *.dtsreal-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)# Base DTB that overlay is applied onto (each first word of $(*-dtbs) expansion)base-dtb-y := $(foreach m, $(multi-dtb-y), $(firstword $(call suffix-search, $m, .dtb, -dtbs))) always-y			+= $(dtb-y) # Add subdir path 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))multi-dtb-y	:= $(addprefix $(obj)/, $(multi-dtb-y))real-dtb-y	:= $(addprefix $(obj)/, $(real-dtb-y))subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym)) # 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))_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%,, \		$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(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%,, \		$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \		$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))endifendif ifeq ($(CONFIG_UBSAN),y)_c_flags += $(if $(patsubst n%,, \		$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \		$(CFLAGS_UBSAN))endif ifeq ($(CONFIG_KCOV),y)_c_flags += $(if $(patsubst n%,, \	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(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%,, \	$(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \	$(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%,, \	$(KCSAN_INSTRUMENT_BARRIERS_$(basetarget).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \	-D__KCSAN_INSTRUMENT_BARRIERS__)endif # $(srctree)/$(src) for including checkin headers from generated source files# $(objtree)/$(obj) for including generated headers from checkin source filesifeq ($(KBUILD_EXTMOD),)ifdef building_out_of_srctree_c_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)_a_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)endifendif 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_aflags = $(if $(part-of-module),				\			$(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE),	\			$(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)) c_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \		 -include $(srctree)/include/linux/compiler_types.h       \		 $(_c_flags) $(modkern_cflags)                           \		 $(basename_flags) $(modname_flags) a_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \		 $(_a_flags) $(modkern_aflags) cpp_flags      = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \		 $(_cpp_flags) ld_flags       = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes dtc_cpp_flags  = -Wp,-MMD,$(depfile).pre.tmp -nostdinc                    \		 $(addprefix -I,$(DTC_INCLUDE))                          \		 -undef -D__DTS__ ifdef CONFIG_OBJTOOL objtool := $(objtree)/tools/objtool/objtool objtool_args =								\	$(if $(CONFIG_HAVE_JUMP_LABEL_HACK), --hacks=jump_label)	\	$(if $(CONFIG_HAVE_NOINSTR_HACK), --hacks=noinstr)		\	$(if $(CONFIG_X86_KERNEL_IBT), --ibt)				\	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)		\	$(if $(CONFIG_UNWINDER_ORC), --orc)				\	$(if $(CONFIG_RETPOLINE), --retpoline)				\	$(if $(CONFIG_RETHUNK), --rethunk)				\	$(if $(CONFIG_SLS), --sls)					\	$(if $(CONFIG_STACK_VALIDATION), --stackval)			\	$(if $(CONFIG_HAVE_STATIC_CALL_INLINE), --static-call)		\	$(if $(CONFIG_HAVE_UACCESS_VALIDATION), --uaccess)		\	$(if $(delay-objtool), --link)					\	$(if $(part-of-module), --module)				\	$(if $(CONFIG_GCOV_KERNEL), --no-unreachable) 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) 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 # 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)) $< $@ # Gzip# --------------------------------------------------------------------------- quiet_cmd_gzip = GZIP    $@      cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@ # DTC# ---------------------------------------------------------------------------DTC ?= $(objtree)/scripts/dtc/dtcDTC_FLAGS += -Wno-interrupt_provider # Disable noisy checks by defaultifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)DTC_FLAGS += -Wno-unit_address_vs_reg \	-Wno-avoid_unnecessary_addr_size \	-Wno-alias_paths \	-Wno-graph_child_address \	-Wno-simple_bus_reg \	-Wno-unique_unit_addressendif ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)DTC_FLAGS += -Wnode_name_chars_strict \	-Wproperty_name_chars_strict \	-Winterrupt_providerendif DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) # Set -@ if the target is a base DTB that overlay is applied ontoDTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@) # Generate an assembly file to wrap the output of the device tree compilerquiet_cmd_dt_S_dtb= DTB     $@cmd_dt_S_dtb=						\{							\	echo '\#include <asm-generic/vmlinux.lds.h>'; 	\	echo '.section .dtb.init.rodata,"a"';		\	echo '.balign STRUCT_ALIGNMENT';		\	echo '.global __dtb_$(subst -,_,$(*F))_begin';	\	echo '__dtb_$(subst -,_,$(*F))_begin:';		\	echo '.incbin "$<" ';				\	echo '__dtb_$(subst -,_,$(*F))_end:';		\	echo '.global __dtb_$(subst -,_,$(*F))_end';	\	echo '.balign STRUCT_ALIGNMENT'; 		\} > $@ $(obj)/%.dtb.S: $(obj)/%.dtb FORCE	$(call if_changed,dt_S_dtb) quiet_cmd_dtc = DTC     $@cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \	$(DTC) -o $@ -b 0 \		$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \		-d $(depfile).dtc.tmp $(dtc-tmp) ; \	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) quiet_cmd_fdtoverlay = DTOVL   $@      cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs) $(multi-dtb-y): FORCE	$(call if_changed,fdtoverlay)$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs) ifneq ($(CHECK_DTBS)$(CHECK_DT_BINDING),)DT_CHECKER ?= dt-validateDT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)DT_BINDING_DIR := Documentation/devicetree/bindingsDT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json quiet_cmd_dtb_check =	CHECK   $@      cmd_dtb_check =	$(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || trueendif define rule_dtc	$(call cmd_and_fixdep,dtc)	$(call cmd,dtb_check)endef $(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE	$(call if_changed_rule,dtc) $(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE	$(call if_changed_dep,dtc) dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) # 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 -c1 stdin stdout > $@ quiet_cmd_lz4_with_size = LZ4     $@      cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \                  $(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 $< $@ # XZ# ---------------------------------------------------------------------------# Use xzkern 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 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.#

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