Re: [PATCH] tcg/arm: Reduce vector alignment requirement for NEON

[Richard Henderson]

On 9/13/21 4:07 AM, Richard W.M. Jones wrote:
> > [    0.000000] Linux version 5.14.0-60.fc36.armv7hl 
> > (mockbuild@buildvm-a32-12.iad2.fedoraproject.org) (gcc (GCC) 11.2.1 20210728 
> > (Red Hat 11.2.1-1), GNU ld version 2.37-9.fc36) #1 SMP Mon Aug 30 14:08:34 UTC 
> > 2021
> >
> > I thought about parameterizing this patch further, but I can't think of
> > another ISA that would be affected.  (i686 clumsily changed its abi 20
> > years ago to avoid faulting on vector spills; other isas so far have
> > allowed vectors to be unaligned.)
>
> Is it possible this change could have caused a more serious
> regression?

I don't think so...

> Now when I try to boot the Fedora kernel using TCG on
> armv7hl I can't even get to the point where it detects virtio-scsi
> devices.
>
> Full log is here (go down to the bottom and work backwards):
>
>    https://kojipkgs.fedoraproject.org//work/tasks/7337/75597337/build.log

I downloaded the 5.14.0-60 kernel from above, and I can reproduce the original error, and 
I see that it's fixed afterward.

I'll have a look at this new build log in a moment...


r~