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LoongArch: Enable jump table for objtool

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For now, it is time to remove -fno-jump-tables to enable jump table for
objtool if the compiler has -mannotate-tablejump, otherwise it is better
to remain -fno-jump-tables to keep compatibility with older compilers.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Link: https://lore.kernel.org/r/20241217010905.13054-8-yangtiezhu@loongson.cn
Acked-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
Tiezhu Yang 2024-12-17 09:09:03 +08:00 • committed by Josh Poimboeuf
parent 88cbb468d4
commit e20ab7d454
2 changed files with 8 additions and 1 deletions
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3
arch/loongarch/Kconfig
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@ -291,6 +291,9 @@ config AS_HAS_LBT_EXTENSION
config AS_HAS_LVZ_EXTENSION
def_bool $(as-instr,hvcl 0)
config CC_HAS_ANNOTATE_TABLEJUMP
def_bool $(cc-option,-mannotate-tablejump)
menu "Kernel type and options"
source "kernel/Kconfig.hz"

6
arch/loongarch/Makefile
View file

@ -101,7 +101,11 @@ KBUILD_AFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)
KBUILD_CFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
ifdef CONFIG_OBJTOOL
KBUILD_CFLAGS += -fno-jump-tables
ifdef CONFIG_CC_HAS_ANNOTATE_TABLEJUMP
KBUILD_CFLAGS += -mannotate-tablejump
else
KBUILD_CFLAGS += -fno-jump-tables # keep compatibility with older compilers
endif
endif
KBUILD_RUSTFLAGS += --target=loongarch64-unknown-none-softfloat -Ccode-model=small