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

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Message-Id: <20250902.185101.101005511917098882.rene@exactcode.com>
Date: Tue, 02 Sep 2025 18:51:01 +0200 (CEST)
From: Rene Rebe <rene@...ctcode.com>
To: glaubitz@...sik.fu-berlin.de
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

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, ...

    René

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

-- 
  René Rebe, ExactCODE GmbH, Berlin, Germany
  https://exactcode.com | https://t2linux.com | https://rene.rebe.de