linux-kernel - [PATCH] LoongArch: Explicitly set -fdirect-access-external-data for vmlinux

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Message-ID: <20231115132137.178523-1-wangrui@loongson.cn>
Date:   Wed, 15 Nov 2023 21:21:37 +0800
From:   WANG Rui <wangrui@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>
Cc:     WANG Xuerui <kernel@...0n.name>, Xi Ruoyao <xry111@...111.site>,
        linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        linux-kbuild@...r.kernel.org, llvm@...ts.linux.dev,
        loongson-kernel@...ts.loongnix.cn, WANG Rui <wangrui@...ngson.cn>
Subject: [PATCH] LoongArch: Explicitly set -fdirect-access-external-data for vmlinux

After this llvm commit [1], The -fno-pic does not imply direct access
external data. Explicitly set -fdirect-access-external-data for vmlinux
that can avoids GOT entries.

Link: https://github.com/llvm/llvm-project/commit/47eeee297775347cbdb7624d6a766c2a3eec4a59
Suggested-by: Xi Ruoyao <xry111@...111.site>
Signed-off-by: WANG Rui <wangrui@...ngson.cn>
---
 arch/loongarch/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
index c31a62521e6b..1f0d74403419 100644
--- a/arch/loongarch/Makefile
+++ b/arch/loongarch/Makefile
@@ -68,6 +68,7 @@ LDFLAGS_vmlinux			+= -static -n -nostdlib
 ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
 cflags-y			+= $(call cc-option,-mexplicit-relocs)
 KBUILD_CFLAGS_KERNEL		+= $(call cc-option,-mdirect-extern-access)
+KBUILD_CFLAGS_KERNEL		+= $(call cc-option,-fdirect-access-external-data)
 KBUILD_AFLAGS_MODULE		+= $(call cc-option,-fno-direct-access-external-data)
 KBUILD_CFLAGS_MODULE		+= $(call cc-option,-fno-direct-access-external-data)
 KBUILD_AFLAGS_MODULE		+= $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
-- 
2.42.1