On Fri, 18 Dec 2020 at 15:00, Russell King - ARM Linux admin
[off-list ref] wrote:

On Fri, Dec 18, 2020 at 01:48:09PM +0000, Guillaume Tucker wrote:

quoted

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.

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