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

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Date:   Mon, 10 Jul 2023 13:01:21 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     WANG Xuerui <kernel@...0n.name>
Cc:     Huacai Chen <chenhuacai@...ngson.cn>,
        Arnd Bergmann <arnd@...db.de>, 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 Mon, Jul 10, 2023 at 12:45 PM WANG Xuerui <kernel@...0n.name> wrote:
>
> 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.
OK, thanks.

Huacai
>
> >
> > 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/
>
>