Re: [PATCH v2 1/1] sparc: fix accurate exception reporting in copy_{from,to}_user for M7

[John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

Hi Rainer,

On Mon, 2025-09-01 at 09:00 +0200, Rainer Orth wrote:
> > in the past, you reported stability issues with the Linux kernel when running
> > inside an LDOM on SPARC M7/M8. Could you verify whether the patch above fixes
> > these problems or whether at least they don't introduce regressions?
> 
> thanks for the heads-up.  Indeed the hangs persist even when the system
> is idle.  However, I've never built a Linux kernel before and have way
> too much on the plate to try now.  Besides, I don't have a reproducer
> for the issue, so even with a patch I'd have to wait for an extended
> period of time to see if the issue is gone, so I'll just wait until the
> patch lands in the Debian/sparc64 repo and see if it helps.

Would it work if I built a kernel for you plus installation instructions
and a quick explanation how to test it?

FWIW, we consider the patch already acceptable when it doesn't introduce
any regressions.

I did some testing on a SPARC S7 yesterday, but the problem is that the
support for SPARC S7 in the Linux kernel is incomplete at the moment and
I had to add it quickly myself which did actually work but I really would
like to verify it on M7 or M8 again to at least not cause regressions.

Thanks,
Adrian

-- 
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