Commit e20ab7d4 authored Dec 17, 2024 by Tiezhu Yang Committed by Josh Poimboeuf Mar 12, 2025

LoongArch: Enable jump table for objtool

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>

parent 88cbb468

arch/loongarch/Kconfig

+3 −0

Original line number	Diff line number	Diff line
		@@ -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"

arch/loongarch/Makefile

+5 −1

Original line number	Diff line number	Diff line
		@@ -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