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

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Message-ID: <8deb9ed8-6c12-4fef-a78c-028de7928803@gaisler.com>
Date: Fri, 5 Sep 2025 10:04:19 +0200
From: Andreas Larsson <andreas@...sler.com>
To: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
 Rene Rebe <rene@...ctcode.com>, kernel@...rcher.dialup.fu-berlin.de
Cc: linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
 anthony.yznaga@...cle.com
Subject: Re: [PATCH 3/4] sparc: fix accurate exception reporting in
 copy_{from_to}_user for Niagara

On 2025-09-02 18:47, John Paul Adrian Glaubitz wrote:
> On Tue, 2025-09-02 at 18:40 +0200, Rene Rebe wrote:
>> 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.

Hi Rene,

Did you have the fourth patch, that is for Niagara 4, applied as well
when you did this testing? If so, we could add your Tested-by to that
patch instead.

Cheers,
Andreas