linux-kernel - Re: [PATCH v2 09/18] arm64: explicitly pass --no-fix-cortex-a53-843419 to GNU gold

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Message-ID: <20171116114722.GD9361@arm.com>
Date:   Thu, 16 Nov 2017 11:47:23 +0000
From:   Will Deacon <will.deacon@....com>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Alex Matveev <alxmtvv@...il.com>, Andi Kleen <ak@...ux.intel.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Greg Hackmann <ghackmann@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v2 09/18] arm64: explicitly pass
 --no-fix-cortex-a53-843419 to GNU gold

On Wed, Nov 15, 2017 at 01:34:19PM -0800, Sami Tolvanen wrote:
> Some versions of GNU gold are known to produce broken code with
> --fix-cortex-a53-843419 as explained in this bug:
> 
>   https://sourceware.org/bugzilla/show_bug.cgi?id=21491
> 
> If ARM64_ERRATUM_843419 is disabled and we're using GNU gold, pass
> --no-fix-cortex-a53-843419 to the linker to ensure the erratum fix is not
> used even if the linker is configured to enable it by default.

But if ARM64_ERRATUM_843419 is enabled, we'll go ahead and generate broken
code?

Will