linux-kernel - Re: next/master bisection: baseline.login on rk3288-rock2-square

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Message-ID: <20210204114420.GW1463@shell.armlinux.org.uk>
Date:   Thu, 4 Feb 2021 11:44:20 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Guillaume Tucker <guillaume.tucker@...labora.com>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Nicolas Pitre <nico@...xnic.net>,
        "kernelci-results@...ups.io" <kernelci-results@...ups.io>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: next/master bisection: baseline.login on rk3288-rock2-square

On Thu, Feb 04, 2021 at 11:32:05AM +0000, Guillaume Tucker wrote:
> Yes it does fix the issue:
> 
>   https://lava.collabora.co.uk/scheduler/job/3173819
> 
> with Ard's fix applied to this test branch:
> 
>   https://gitlab.collabora.com/gtucker/linux/-/commits/next-20210203-ard-fix/
> 
> 
> +clang +Nick
> 
> It's worth mentioning that the issue only happens with kernels
> built with Clang.  As you can see there are several other arm
> platforms failing with clang-11 builds but booting fine with
> gcc-8:

My gut feeling is that it isn't Clang specific - it's likely down to
the exact code/data placement, how things end up during decompression,
and exactly what state the cache ends up in.

That certainly was the case with the original regression.

-- 
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