forked from mirrors/linux
4074532758
Modify modpost to use binary search for converting addresses back into symbol references. Previously it used linear search. This change saves a few seconds of wall time for defconfig builds, but can save several minutes on allyesconfigs. Before: $ make LLVM=1 -j128 allyesconfig vmlinux -s KCFLAGS="-Wno-error" $ time scripts/mod/modpost -M -m -a -N -o vmlinux.symvers vmlinux.o 198.38user 1.27system 3:19.71elapsed After: $ make LLVM=1 -j128 allyesconfig vmlinux -s KCFLAGS="-Wno-error" $ time scripts/mod/modpost -M -m -a -N -o vmlinux.symvers vmlinux.o 11.91user 0.85system 0:12.78elapsed Signed-off-by: Jack Brennen <jbrennen@google.com> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
28 lines
892 B
Makefile
28 lines
892 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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OBJECT_FILES_NON_STANDARD := y
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CFLAGS_REMOVE_empty.o += $(CC_FLAGS_LTO)
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hostprogs-always-y += modpost mk_elfconfig
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always-y += empty.o
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modpost-objs := modpost.o file2alias.o sumversion.o symsearch.o
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devicetable-offsets-file := devicetable-offsets.h
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$(obj)/$(devicetable-offsets-file): $(obj)/devicetable-offsets.s FORCE
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$(call filechk,offsets,__DEVICETABLE_OFFSETS_H__)
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targets += $(devicetable-offsets-file) devicetable-offsets.s
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# dependencies on generated files need to be listed explicitly
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$(obj)/modpost.o $(obj)/file2alias.o $(obj)/sumversion.o $(obj)/symsearch.o: $(obj)/elfconfig.h
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$(obj)/file2alias.o: $(obj)/$(devicetable-offsets-file)
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quiet_cmd_elfconfig = MKELF $@
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cmd_elfconfig = $(obj)/mk_elfconfig < $< > $@
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$(obj)/elfconfig.h: $(obj)/empty.o $(obj)/mk_elfconfig FORCE
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$(call if_changed,elfconfig)
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targets += elfconfig.h
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