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

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Message-ID: <cf4e16f7846a3324521828e71c0676b9c524ebbf.camel@physik.fu-berlin.de>
Date: Tue, 02 Sep 2025 18:47:41 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Rene Rebe <rene@...ctcode.com>, kernel@...rcher.dialup.fu-berlin.de
Cc: 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

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.

Do you happen to have a SPARC T1?

Adrian

-- 
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