linux-kernel - Re: [PATCH] MIPS: Support binutils configured with --enable-mips-fix-loongson3-llsc=yes

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Message-ID: <20210115144222.GD15166@alpha.franken.de>
Date:   Fri, 15 Jan 2021 15:42:22 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Aurelien Jarno <aurelien@...el32.net>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        YunQiang Su <syq@...ian.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        "open list:MIPS" <linux-mips@...r.kernel.org>
Subject: Re: [PATCH] MIPS: Support binutils configured with
 --enable-mips-fix-loongson3-llsc=yes

On Sat, Jan 09, 2021 at 08:30:47PM +0100, Aurelien Jarno wrote:
> >From version 2.35, binutils can be configured with
> --enable-mips-fix-loongson3-llsc=yes, which means it defaults to
> -mfix-loongson3-llsc. This breaks labels which might then point at the
> wrong instruction.
> 
> The workaround to explicitly pass -mno-fix-loongson3-llsc has been
> added in Linux version 5.1, but is only enabled when building a Loongson
> 64 kernel. As vendors might use a common toolchain for building Loongson
> and non-Loongson kernels, just move that workaround to
> arch/mips/Makefile. At the same time update the comments to reflect the
> current status.
> 
> Cc: stable@...r.kernel.org # 5.1+
> Cc: YunQiang Su <syq@...ian.org>
> Signed-off-by: Aurelien Jarno <aurelien@...el32.net>
> ---
>  arch/mips/Makefile            | 19 +++++++++++++++++++
>  arch/mips/loongson64/Platform | 22 ----------------------
>  2 files changed, 19 insertions(+), 22 deletions(-)

I've applied it to mips-next, but I consider such changes as rather rude.
I would have expected, that the workaround is only enabled via command
line option and not by default.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]