From: Tiezhu Yang Date: Wed, 20 Aug 2025 14:23:15 +0000 (+0800) Subject: LoongArch: Pass annotate-tablejump option if LTO is enabled X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=5dfea6644d201bfeffaa7e0d79d62309856613b7;p=users%2Fjedix%2Flinux-maple.git LoongArch: Pass annotate-tablejump option if LTO is enabled When compiling with LLVM and CONFIG_LTO_CLANG is set, there exist many objtool warnings "sibling call from callable instruction with modified stack frame". For this special case, the related object file shows that there is no generated relocation section '.rela.discard.tablejump_annotate' for the table jump instruction jirl, thus objtool can not know that what is the actual destination address. It needs to do something on the LLVM side to make sure that there is the relocation section '.rela.discard.tablejump_annotate' if LTO is enabled, but in order to maintain compatibility for the current LLVM compiler, this can be done in the kernel Makefile for now. Ensure it is aware of linker with LTO, '--loongarch-annotate-tablejump' needs to be passed via '-mllvm' to ld.lld. Note that it should also pass the compiler option -mannotate-tablejump rather than only pass '-mllvm --loongarch-annotate-tablejump' to ld.lld if LTO is enabled, otherwise there are no jump info for some table jump instructions. Fixes: e20ab7d454ee ("LoongArch: Enable jump table for objtool") Closes: https://lore.kernel.org/loongarch/20250731175655.GA1455142@ax162/ Reported-by: Nathan Chancellor Tested-by: Nathan Chancellor Co-developed-by: WANG Rui Signed-off-by: WANG Rui Signed-off-by: Tiezhu Yang Signed-off-by: Huacai Chen --- diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile index b0703a4e02a2..a3a9759414f4 100644 --- a/arch/loongarch/Makefile +++ b/arch/loongarch/Makefile @@ -102,7 +102,13 @@ KBUILD_CFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma) ifdef CONFIG_OBJTOOL ifdef CONFIG_CC_HAS_ANNOTATE_TABLEJUMP +# The annotate-tablejump option can not be passed to LLVM backend when LTO is enabled. +# Ensure it is aware of linker with LTO, '--loongarch-annotate-tablejump' also needs to +# be passed via '-mllvm' to ld.lld. KBUILD_CFLAGS += -mannotate-tablejump +ifdef CONFIG_LTO_CLANG +KBUILD_LDFLAGS += -mllvm --loongarch-annotate-tablejump +endif else KBUILD_CFLAGS += -fno-jump-tables # keep compatibility with older compilers endif