linux-kernel - Re: [PATCH 3/4] sparc: fix accurate exception reporting in copy_{from_to}

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Message-ID: <1d32418278ac11e4a2f65c8b6bcd4c90143a1451.camel@physik.fu-berlin.de>
Date: Tue, 02 Sep 2025 18:53:29 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Rene Rebe <rene@...ctcode.com>
Cc: kernel@...rcher.dialup.fu-berlin.de, linux-kernel@...r.kernel.org, 
	sparclinux@...r.kernel.org, andreas@...sler.com, anthony.yznaga@...cle.com
Subject: Re: [PATCH 3/4] sparc: fix accurate exception reporting in
 copy_{from_to}_user for Niagara

On Tue, 2025-09-02 at 18:51 +0200, Rene Rebe wrote:
> From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
> 
> > Hi Rene,
> > 
> > On Tue, 2025-09-02 at 18:40 +0200, Rene Rebe wrote:
> > > Hi,
> > > 
> > > From: Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
> > > 
> > > > Fixes: 7ae3aaf53f16 ("sparc64: Convert NGcopy_{from,to}_user to accurate exception reporting.")
> > > > Signed-off-by: Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
> > > 
> > > Tested-by: René Rebe <rene@...ctcode.com> # UltraSparc T4 SPARC T4-1 Server
> > 
> > Thanks for the testing! However, this actually needs to be tested on a SPARC T1
> > as both T2 and T4 have their own implementation that is being used. Testing on a
> > T4 will therefore not invoke this particular code unless you modify the kernel in
> > head_64.S to employ the Niagara 1 code on Niagara 4.
> 
> Ah right, sorry, IIRC you wrote that :-/
> 
> > Do you happen to have a SPARC T1?
> 
> Unfortuantely not. A T2 user might have one, but I could also modify
> the kernel and use the less optimized T1 code if that helps, ...

I have done that already to test the Niagara 1 code on Niagara 4.

However, it would be nice to test on a real T1. Unfortunately, I haven't found
anyone yet who got one. If you could ask your users, that would be great.

Otherwise, we will have to go with the current level of testing.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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