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Date:   Fri, 18 Dec 2020 15:01:26 +0100
From:   Ard Biesheuvel <>
To:     Russell King - ARM Linux admin <>
Cc:     Guillaume Tucker <>,,
        Linus Walleij <>,
        Nick Desaulniers <>,
        Kees Cook <>,
        Abbott Liu <>,
        Linux Kernel Mailing List <>,
        "" <>,
        Ingo Molnar <>,
        Linux ARM <>
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
<> 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 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.

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