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5e9e95cc91
When CONFIG_TRIM_UNUSED_KSYMS is enabled, Kbuild recursively traverses the directory tree to determine which EXPORT_SYMBOL to trim. If an EXPORT_SYMBOL turns out to be unused by anyone, Kbuild begins the second traverse, where some source files are recompiled with their EXPORT_SYMBOL() tuned into a no-op. Linus stated negative opinions about this slowness in commits: -5cf0fd591f("Kbuild: disable TRIM_UNUSED_KSYMS option") -a555bdd0c5("Kbuild: enable TRIM_UNUSED_KSYMS again, with some guarding") We can do this better now. The final data structures of EXPORT_SYMBOL are generated by the modpost stage, so modpost can selectively emit KSYMTAB entries that are really used by modules. Commitf73edc8951("kbuild: unify two modpost invocations") is another ground-work to do this in a one-pass algorithm. With the list of modules, modpost sets sym->used if it is used by a module. modpost emits KSYMTAB only for symbols with sym->used==true. BTW, Nicolas explained why the trimming was implemented with recursion: https://lore.kernel.org/all/2o2rpn97-79nq-p7s2-nq5-8p83391473r@syhkavp.arg/ Actually, we never achieved that level of optimization where the chain reaction of trimming comes into play because: - CONFIG_LTO_CLANG cannot remove any unused symbols - CONFIG_LD_DEAD_CODE_DATA_ELIMINATION is enabled only for vmlinux, but not modules If deeper trimming is required, we need to revisit this, but I guess that is unlikely to happen. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
511 lines
17 KiB
Makefile
511 lines
17 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# ==========================================================================
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# Building
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# ==========================================================================
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src := $(obj)
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PHONY := $(obj)/
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$(obj)/:
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# Init all relevant variables used in kbuild files so
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# 1) they have correct type
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# 2) they do not inherit any value from the environment
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obj-y :=
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obj-m :=
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lib-y :=
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lib-m :=
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always-y :=
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always-m :=
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targets :=
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subdir-y :=
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subdir-m :=
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EXTRA_AFLAGS :=
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EXTRA_CFLAGS :=
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EXTRA_CPPFLAGS :=
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EXTRA_LDFLAGS :=
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asflags-y :=
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ccflags-y :=
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rustflags-y :=
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cppflags-y :=
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ldflags-y :=
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subdir-asflags-y :=
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subdir-ccflags-y :=
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# Read auto.conf if it exists, otherwise ignore
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-include include/config/auto.conf
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include $(srctree)/scripts/Kbuild.include
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include $(srctree)/scripts/Makefile.compiler
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include $(kbuild-file)
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include $(srctree)/scripts/Makefile.lib
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# Do not include hostprogs rules unless needed.
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# $(sort ...) is used here to remove duplicated words and excessive spaces.
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hostprogs := $(sort $(hostprogs))
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ifneq ($(hostprogs),)
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include $(srctree)/scripts/Makefile.host
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endif
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# Do not include userprogs rules unless needed.
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# $(sort ...) is used here to remove duplicated words and excessive spaces.
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userprogs := $(sort $(userprogs))
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ifneq ($(userprogs),)
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include $(srctree)/scripts/Makefile.userprogs
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endif
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ifndef obj
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$(warning kbuild: Makefile.build is included improperly)
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endif
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ifeq ($(need-modorder),)
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ifneq ($(obj-m),)
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$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
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$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
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endif
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endif
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# ===========================================================================
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# subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...)
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subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y)))
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subdir-modorder := $(sort $(filter %/modules.order, $(obj-m)))
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targets-for-builtin := $(extra-y)
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ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
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targets-for-builtin += $(obj)/lib.a
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endif
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ifdef need-builtin
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targets-for-builtin += $(obj)/built-in.a
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endif
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targets-for-modules := $(foreach x, o mod, \
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$(patsubst %.o, %.$x, $(filter %.o, $(obj-m))))
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ifdef need-modorder
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targets-for-modules += $(obj)/modules.order
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endif
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targets += $(targets-for-builtin) $(targets-for-modules)
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# Linus' kernel sanity checking tool
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ifeq ($(KBUILD_CHECKSRC),1)
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quiet_cmd_checksrc = CHECK $<
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cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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else ifeq ($(KBUILD_CHECKSRC),2)
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quiet_cmd_force_checksrc = CHECK $<
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cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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endif
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ifneq ($(KBUILD_EXTRA_WARN),)
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cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $(KDOCFLAGS) \
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$(if $(findstring 2, $(KBUILD_EXTRA_WARN)), -Wall) \
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$<
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endif
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# Compile C sources (.c)
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# ---------------------------------------------------------------------------
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quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
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cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $<
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$(obj)/%.s: $(src)/%.c FORCE
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$(call if_changed_dep,cc_s_c)
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quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
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cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
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$(obj)/%.i: $(src)/%.c FORCE
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$(call if_changed_dep,cpp_i_c)
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genksyms = scripts/genksyms/genksyms \
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$(if $(1), -T $(2)) \
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$(if $(KBUILD_PRESERVE), -p) \
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-r $(or $(wildcard $(2:.symtypes=.symref)), /dev/null)
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# These mirror gensymtypes_S and co below, keep them in synch.
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cmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms)
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quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_c = $(call cmd_gensymtypes_c,true,$@) >/dev/null
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$(obj)/%.symtypes : $(src)/%.c FORCE
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$(call cmd,cc_symtypes_c)
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# LLVM assembly
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# Generate .ll files from .c
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quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
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cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -fno-discard-value-names -o $@ $<
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$(obj)/%.ll: $(src)/%.c FORCE
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$(call if_changed_dep,cc_ll_c)
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# C (.c) files
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# The C file is compiled and updated dependency information is generated.
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# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
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is-single-obj-m = $(and $(part-of-module),$(filter $@, $(obj-m)),y)
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# When a module consists of a single object, there is no reason to keep LLVM IR.
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# Make $(LD) covert LLVM IR to ELF here.
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ifdef CONFIG_LTO_CLANG
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cmd_ld_single_m = $(if $(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@)
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endif
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quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
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cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \
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$(cmd_ld_single_m) \
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$(cmd_objtool)
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ifdef CONFIG_MODVERSIONS
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# When module versioning is enabled the following steps are executed:
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# o compile a <file>.o from <file>.c
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# o if <file>.o doesn't contain a __export_symbol_*, i.e. does
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# not export symbols, it's done.
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# o otherwise, we calculate symbol versions using the good old
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# genksyms on the preprocessed source and dump them into the .cmd file.
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# o modpost will extract versions from that file and create *.c files that will
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# be compiled and linked to the kernel and/or modules.
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gen_symversions = \
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if $(NM) $@ 2>/dev/null | grep -q ' __export_symbol_'; then \
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$(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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>> $(dot-target).cmd; \
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fi
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cmd_gen_symversions_c = $(call gen_symversions,c)
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endif
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ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
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# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
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ifdef BUILD_C_RECORDMCOUNT
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ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
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RECORDMCOUNT_FLAGS = -w
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endif
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# Due to recursion, we must skip empty.o.
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# The empty.o file is created in the make process in order to determine
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# the target endianness and word size. It is made before all other C
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# files, including recordmcount.
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sub_cmd_record_mcount = \
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if [ $(@) != "scripts/mod/empty.o" ]; then \
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$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
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fi;
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recordmcount_source := $(srctree)/scripts/recordmcount.c \
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$(srctree)/scripts/recordmcount.h
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else
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sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
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"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
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"$(if $(CONFIG_64BIT),64,32)" \
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"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
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"$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
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"$(if $(part-of-module),1,0)" "$(@)";
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recordmcount_source := $(srctree)/scripts/recordmcount.pl
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endif # BUILD_C_RECORDMCOUNT
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cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
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$(sub_cmd_record_mcount))
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endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
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# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
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# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
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# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
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is-standard-object = $(if $(filter-out y%, $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y)
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$(obj)/%.o: objtool-enabled = $(if $(is-standard-object),$(if $(delay-objtool),$(is-single-obj-m),y))
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ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
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cmd_warn_shared_object = $(if $(word 2, $(modname-multi)),$(warning $(kbuild-file): $*.o is added to multiple modules: $(modname-multi)))
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endif
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define rule_cc_o_c
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$(call cmd_and_fixdep,cc_o_c)
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$(call cmd,checksrc)
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$(call cmd,checkdoc)
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$(call cmd,gen_objtooldep)
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$(call cmd,gen_symversions_c)
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$(call cmd,record_mcount)
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$(call cmd,warn_shared_object)
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endef
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define rule_as_o_S
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$(call cmd_and_fixdep,as_o_S)
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$(call cmd,gen_objtooldep)
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$(call cmd,gen_symversions_S)
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$(call cmd,warn_shared_object)
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endef
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# Built-in and composite module parts
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$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
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$(call if_changed_rule,cc_o_c)
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$(call cmd,force_checksrc)
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# To make this rule robust against "Argument list too long" error,
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# ensure to add $(obj)/ prefix by a shell command.
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cmd_mod = printf '%s\n' $(call real-search, $*.o, .o, -objs -y -m) | \
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$(AWK) '!x[$$0]++ { print("$(obj)/"$$0) }' > $@
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$(obj)/%.mod: FORCE
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$(call if_changed,mod)
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quiet_cmd_cc_lst_c = MKLST $@
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cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
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$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
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System.map $(OBJDUMP) > $@
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$(obj)/%.lst: $(src)/%.c FORCE
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$(call if_changed_dep,cc_lst_c)
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# Compile Rust sources (.rs)
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# ---------------------------------------------------------------------------
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rust_allowed_features := core_ffi_c,explicit_generic_args_with_impl_trait,new_uninit,pin_macro
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rust_common_cmd = \
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RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \
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-Zallow-features=$(rust_allowed_features) \
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-Zcrate-attr=no_std \
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-Zcrate-attr='feature($(rust_allowed_features))' \
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--extern alloc --extern kernel \
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--crate-type rlib -L $(objtree)/rust/ \
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--crate-name $(basename $(notdir $@)) \
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--emit=dep-info=$(depfile)
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# `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit
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# will be used. We explicitly request `-Ccodegen-units=1` in any case, and
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# the compiler shows a warning if it is not 1. However, if we ever stop
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# requesting it explicitly and we start using some other `--emit` that does not
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# imply it (and for which codegen is performed), then we would be out of sync,
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# i.e. the outputs we would get for the different single targets (e.g. `.ll`)
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# would not match each other.
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quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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cmd_rustc_o_rs = $(rust_common_cmd) --emit=obj=$@ $<
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$(obj)/%.o: $(src)/%.rs FORCE
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$(call if_changed_dep,rustc_o_rs)
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quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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cmd_rustc_rsi_rs = \
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$(rust_common_cmd) -Zunpretty=expanded $< >$@; \
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command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) $@
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$(obj)/%.rsi: $(src)/%.rs FORCE
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$(call if_changed_dep,rustc_rsi_rs)
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quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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cmd_rustc_s_rs = $(rust_common_cmd) --emit=asm=$@ $<
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$(obj)/%.s: $(src)/%.rs FORCE
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$(call if_changed_dep,rustc_s_rs)
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quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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cmd_rustc_ll_rs = $(rust_common_cmd) --emit=llvm-ir=$@ $<
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$(obj)/%.ll: $(src)/%.rs FORCE
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$(call if_changed_dep,rustc_ll_rs)
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# Compile assembler sources (.S)
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# ---------------------------------------------------------------------------
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# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
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# or a file that it includes, in order to get versioned symbols. We build a
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# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
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# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
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#
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# This is convoluted. The .S file must first be preprocessed to run guards and
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# expand names, then the resulting exports must be constructed into plain
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# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
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# to make the genksyms input.
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#
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# These mirror gensymtypes_c and co above, keep them in synch.
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cmd_gensymtypes_S = \
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{ echo "\#include <linux/kernel.h>" ; \
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echo "\#include <asm/asm-prototypes.h>" ; \
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$(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/EXPORT_SYMBOL(\1);/p' ; } | \
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$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
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quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_S = $(call cmd_gensymtypes_S,true,$@) >/dev/null
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$(obj)/%.symtypes : $(src)/%.S FORCE
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$(call cmd,cc_symtypes_S)
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quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
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cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
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$(obj)/%.s: $(src)/%.S FORCE
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$(call if_changed_dep,cpp_s_S)
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quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)
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ifdef CONFIG_ASM_MODVERSIONS
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# versioning matches the C process described above, with difference that
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# we parse asm-prototypes.h C header to get function definitions.
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cmd_gen_symversions_S = $(call gen_symversions,S)
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endif
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$(obj)/%.o: $(src)/%.S FORCE
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$(call if_changed_rule,as_o_S)
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targets += $(filter-out $(subdir-builtin), $(real-obj-y))
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targets += $(filter-out $(subdir-modorder), $(real-obj-m))
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targets += $(real-dtb-y) $(lib-y) $(always-y)
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# Linker scripts preprocessor (.lds.S -> .lds)
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# ---------------------------------------------------------------------------
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quiet_cmd_cpp_lds_S = LDS $@
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cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
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-D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
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$(obj)/%.lds: $(src)/%.lds.S FORCE
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$(call if_changed_dep,cpp_lds_S)
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# ASN.1 grammar
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# ---------------------------------------------------------------------------
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quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch]
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cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
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$(basename $@).c $(basename $@).h
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$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
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$(call cmd,asn1_compiler)
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# Build the compiled-in targets
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# ---------------------------------------------------------------------------
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# To build objects in subdirs, we need to descend into the directories
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$(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ;
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$(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
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#
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# Rule to compile a set of .o files into one .a file (without symbol table)
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#
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# To make this rule robust against "Argument list too long" error,
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# remove $(obj)/ prefix, and restore it by a shell command.
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quiet_cmd_ar_builtin = AR $@
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cmd_ar_builtin = rm -f $@; \
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$(if $(real-prereqs), printf "$(obj)/%s " $(patsubst $(obj)/%,%,$(real-prereqs)) | xargs) \
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$(AR) cDPrST $@
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$(obj)/built-in.a: $(real-obj-y) FORCE
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$(call if_changed,ar_builtin)
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#
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# Rule to create modules.order file
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#
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# Create commands to either record .ko file or cat modules.order from
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# a subdirectory
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# Add $(obj-m) as the prerequisite to avoid updating the timestamp of
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# modules.order unless contained modules are updated.
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cmd_modules_order = { $(foreach m, $(real-prereqs), \
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$(if $(filter %/modules.order, $m), cat $m, echo $m);) :; } \
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> $@
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$(obj)/modules.order: $(obj-m) FORCE
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$(call if_changed,modules_order)
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#
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# Rule to compile a set of .o files into one .a file (with symbol table)
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#
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$(obj)/lib.a: $(lib-y) FORCE
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$(call if_changed,ar)
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quiet_cmd_ld_multi_m = LD [M] $@
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cmd_ld_multi_m = $(LD) $(ld_flags) -r -o $@ @$(patsubst %.o,%.mod,$@) $(cmd_objtool)
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define rule_ld_multi_m
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$(call cmd_and_savecmd,ld_multi_m)
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$(call cmd,gen_objtooldep)
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endef
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$(multi-obj-m): objtool-enabled := $(delay-objtool)
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$(multi-obj-m): part-of-module := y
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$(multi-obj-m): %.o: %.mod FORCE
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$(call if_changed_rule,ld_multi_m)
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$(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
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# Add intermediate targets:
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# When building objects with specific suffix patterns, add intermediate
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# targets that the final targets are derived from.
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intermediate_targets = $(foreach sfx, $(2), \
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$(patsubst %$(strip $(1)),%$(sfx), \
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$(filter %$(strip $(1)), $(targets))))
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# %.asn1.o <- %.asn1.[ch] <- %.asn1
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# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
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# %.dtbo.o <- %.dtbo.S <- %.dtbo <- %.dtso
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# %.lex.o <- %.lex.c <- %.l
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# %.tab.o <- %.tab.[ch] <- %.y
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targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
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$(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
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$(call intermediate_targets, .dtbo.o, .dtbo.S .dtbo) \
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$(call intermediate_targets, .lex.o, .lex.c) \
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$(call intermediate_targets, .tab.o, .tab.c .tab.h)
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# Build
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# ---------------------------------------------------------------------------
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$(obj)/: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \
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$(if $(KBUILD_MODULES), $(targets-for-modules)) \
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$(subdir-ym) $(always-y)
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@:
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# Single targets
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# ---------------------------------------------------------------------------
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single-subdirs := $(foreach d, $(subdir-ym), $(if $(filter $d/%, $(MAKECMDGOALS)), $d))
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single-subdir-goals := $(filter $(addsuffix /%, $(single-subdirs)), $(MAKECMDGOALS))
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$(single-subdir-goals): $(single-subdirs)
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@:
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# Descending
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# ---------------------------------------------------------------------------
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PHONY += $(subdir-ym)
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$(subdir-ym):
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$(Q)$(MAKE) $(build)=$@ \
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need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \
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need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1) \
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$(filter $@/%, $(single-subdir-goals))
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# Add FORCE to the prequisites of a target to force it to be always rebuilt.
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# ---------------------------------------------------------------------------
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PHONY += FORCE
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FORCE:
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targets += $(filter-out $(single-subdir-goals), $(MAKECMDGOALS))
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targets := $(filter-out $(PHONY), $(targets))
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# Read all saved command lines and dependencies for the $(targets) we
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# may be building above, using $(if_changed{,_dep}). As an
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# optimization, we don't need to read them if the target does not
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# exist, we will rebuild anyway in that case.
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existing-targets := $(wildcard $(sort $(targets)))
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-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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# Create directories for object files if they do not exist
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obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets))))
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# If targets exist, their directories apparently exist. Skip mkdir.
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existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
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obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
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ifneq ($(obj-dirs),)
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$(shell mkdir -p $(obj-dirs))
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endif
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.PHONY: $(PHONY)
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