linux-kernel - Re: next/master bisection: baseline.login on ox820-cloudengines-pogoplug-series-3

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Message-ID: <CAMj1kXH-z91_EOpw8_5DCm22DiaU7FxzsCMmWV3-4=uM-FCM1g@mail.gmail.com>
Date:   Fri, 18 Dec 2020 15:01:26 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Guillaume Tucker <guillaume.tucker@...labora.com>,
        kernelci-results@...ups.io,
        Linus Walleij <linus.walleij@...aro.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Abbott Liu <liuwenliang@...wei.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "kernelci@...ups.io" <kernelci@...ups.io>,
        Ingo Molnar <mingo@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: next/master bisection: baseline.login on ox820-cloudengines-pogoplug-series-3

On Fri, 18 Dec 2020 at 15:00, Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:
>
> On Fri, Dec 18, 2020 at 01:48:09PM +0000, Guillaume Tucker wrote:
> > Please see the bisection report below about a boot failure on
> > ox820-cloudengines-pogoplug-series-3.  There was also a bisection
> > yesterday with next-20201216 which landed on the same commit, on
> > the same platform and also with oxnas_v6_defconfig.  I'm not
> > aware of any other platform on kernelci.org showing the same
> > regression.
>
> Ah, I bet I know what's happening.
>
> We test for the presence of VFP by issuing an instruction to read
> FPSID. If VFP is not present, this will raise an undefined instruction
> exception, and we expect to head into the vfp_testing_entry code.
>
> I bet Pogoplug, being an ARM11 MPCore platform, either raises an
> exception here.
>
> We probably need to also rework the code in vfp_init() as well to
> register a temporary hook when reading the FPSID.
>

Thanks for diagnosing that - I wasn't quite sure what was going on.

I will look into this later today.