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

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Message-Id: <A7C1772C-FBB1-49B0-B942-5D4D6F3376D8@exactcode.de>
Date: Tue, 2 Sep 2025 23:51:40 +0200
From: René Rebe <rene@...ctcode.de>
To: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc: Rene Rebe <rene@...ctcode.com>,
 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

Hi,

> On 2. Sep 2025, at 18:53, John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de> wrote:
> 
> 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.

In case someone has a T1 or M8 in their basement -or otherwise likes to test new things-
here is the current WIP pre-release build with basically everything as up-to-date as possible 
and the patches included:

	https://dl.t2sde.org/binary/2025/incoming/t2-25.9-sparc64-base-wayland-glibc-gcc-ultrasparc3.iso

the .d directory has the content for cherry picking. Even latest Firefox 142 works (at least it did last
week when I patched and tested it ;-)

	René

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

-- 
https://exactco.de - https://t2linux.com - https://rene.rebe.de