linux-kernel - Re: [PATCH v2 1/1] sparc: fix accurate exception reporting in copy_{from,to}

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Message-ID: <4c92d08cff24c04023bff8555ecf3bbd2eb0e944.camel@physik.fu-berlin.de>
Date: Mon, 01 Sep 2025 09:05:58 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Rainer Orth <ro@...iTec.Uni-Bielefeld.DE>
Cc: Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>, 
	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org, Andreas Larsson
	 <andreas@...sler.com>, Anthony Yznaga <anthony.yznaga@...cle.com>
Subject: Re: [PATCH v2 1/1] sparc: fix accurate exception reporting in
 copy_{from,to}_user for M7

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

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913