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Message-ID: <20240703110624.1301830-1-wangrui@loongson.cn> Date: Wed, 3 Jul 2024 19:06:24 +0800 From: WANG Rui <wangrui@...ngson.cn> To: Huacai Chen <chenhuacai@...nel.org> Cc: WANG Xuerui <kernel@...0n.name>, Xi Ruoyao <xry111@...111.site>, Xuefeng Li <lixuefeng@...ngson.cn>, loongarch@...ts.linux.dev, rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn, WANG Rui <wangrui@...ngson.cn> Subject: [PATCH] LoongArch: rust: Use rustc option -Zdirect-access-external-data -Zdirect-access-external-data is a new Rust compiler option added in Rust 1.78, which we use to optimize the access of external data in the Linux kernel's Rust code. This patch modifies the Rust code in vmlinux to directly access externa data, using PC-REL instead of GOT. However, Rust code whithin modules is constrained by the PC-REL addressing range and is explicitly set to use an indirect method. Signed-off-by: WANG Rui <wangrui@...ngson.cn> --- arch/loongarch/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile index 8674e7e24c4a..ae3f80622f4c 100644 --- a/arch/loongarch/Makefile +++ b/arch/loongarch/Makefile @@ -105,7 +105,8 @@ KBUILD_CFLAGS += -fno-jump-tables endif KBUILD_RUSTFLAGS += --target=loongarch64-unknown-none-softfloat -KBUILD_RUSTFLAGS_MODULE += -Crelocation-model=pic +KBUILD_RUSTFLAGS_KERNEL += -Zdirect-access-external-data=yes +KBUILD_RUSTFLAGS_MODULE += -Zdirect-access-external-data=no ifeq ($(CONFIG_RELOCATABLE),y) KBUILD_CFLAGS_KERNEL += -fPIE -- 2.45.2
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