linux-kernel - Re: [PATCH V2] LoongArch: Fix module relocation error with binutils 2.41

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Date:   Thu, 10 Aug 2023 11:20:35 +0800
From:   Xi Ruoyao <xry111@...111.site>
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>, Xuerui Wang <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn,
        WANG Xuerui <git@...0n.name>, stable@...r.kernel.org
Subject: Re: [PATCH V2] LoongArch: Fix module relocation error with binutils
 2.41

Can we backport this patch into stable?  It fixes a build error with
binutils >= 2.41.

On Mon, 2023-07-10 at 13:00 +0800, Huacai Chen wrote:
> Binutils 2.41 enables linker relaxation by default, but the kernel
> module loader doesn't support that, so just disable it. Otherwise we
> get such an error when loading modules:
> 
> "Unknown relocation type 102"
> 
> As an alternative, we could add linker relaxation support in the kernel
> module loader. But it 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.
> 
> Reviewed-by: WANG Xuerui <git@...0n.name>
> 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

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University