[PATCH v1 2/3] arm64: Only link libstub to final vmlinux
From: Tiezhu Yang <yangtiezhu@loongson.cn>
Date: 2025-09-19 09:36:26
Also in:
linux-efi, linux-kbuild, linux-riscv, lkml, loongarch
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Since the efistub functions are useless for stack unwinder, they can be ignored by objtool. No need to link libstub to the vmlinux.o, only link libstub to the final vmlinux. Otherwise, there may be objtool warnings when arm64 supports objtool, this is to make consistent with the other archs that use libstub. Link: https://lore.kernel.org/lkml/pq4h7jgndnt6p45lj4kgubxjd5gidfetugcuf5rcxzxxanzetd@6rrlpjnjsmuy/ (local) Suggested-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> --- arch/arm64/Makefile | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 73a10f65ce8b..038f37ef2143 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile@@ -156,7 +156,10 @@ KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) libs-y := arch/arm64/lib/ $(libs-y) -libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a + +ifdef CONFIG_EFI_STUB +KBUILD_VMLINUX_LIBS_PRELINK += $(objtree)/drivers/firmware/efi/libstub/lib.a +endif # Default target when executing plain make boot := arch/arm64/boot
--
2.42.0