linux-kernel - Re: [PATCH] LoongArch: Fix module relocation error with binutils 2.41

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Date:   Mon, 10 Jul 2023 12:45:16 +0800
From:   WANG Xuerui <kernel@...0n.name>
To:     Huacai Chen <chenhuacai@...ngson.cn>,
        Arnd Bergmann <arnd@...db.de>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     loongarch@...ts.linux.dev, linux-arch@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH] LoongArch: Fix module relocation error with binutils 2.41

On 2023/7/10 12:29, Huacai Chen wrote:
> Binutils 2.41 enable linker relaxation by default, but kernel module

"enables" / "will enable"

> loader doesn't support that, so disable it. Otherwise we get such an
> error when loading modules: "Unknown relocation type 102".

IMO it could be better to also justify the disabling (instead of adding 
proper support): linker relaxation is relatively large complexity that 
may or may not bring a similar gain, and we don't really want to include 
this linker pass in the kernel.

> 
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
>   arch/loongarch/Makefile | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
> index 09ba338a64de..7466d3b15db8 100644
> --- a/arch/loongarch/Makefile
> +++ b/arch/loongarch/Makefile
> @@ -68,6 +68,8 @@ 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_AFLAGS_MODULE		+= $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
> +KBUILD_CFLAGS_MODULE		+= $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
>   else
>   cflags-y			+= $(call cc-option,-mno-explicit-relocs)
>   KBUILD_AFLAGS_KERNEL		+= -Wa,-mla-global-with-pcrel

The code changes are good. With the commit message improved:

Reviewed-by: WANG Xuerui <git@...0n.name>

-- 
WANG "xen0n" Xuerui

Linux/LoongArch mailing list: https://lore.kernel.org/loongarch/