linux-kernel - [PATCH v1 2/3] arm64: Only link libstub to final vmlinux

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Message-ID: <20250919093615.30235-3-yangtiezhu@loongson.cn>
Date: Fri, 19 Sep 2025 17:36:14 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Josh Poimboeuf <jpoimboe@...nel.org>,
	Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org,
	linux-efi@...r.kernel.org,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 2/3] arm64: Only link libstub to final vmlinux

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/
Suggested-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.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