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

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Date:   Thu, 10 Aug 2023 11:21:40 +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

On Thu, 2023-08-10 at 11:20 +0800, Xi Ruoyao wrote:
> Can we backport this patch into stable?  It fixes a build error with
> binutils >= 2.41.

Correction: not a build error, but all modules won't load if built with
binutils >= 2.41 without the patch.

> 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