linux-kernel - Re: [PATCH v4 2/5] sparc: fix accurate exception reporting in copy_{from_to}

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Message-ID: <c3e1173f99e6222ab09093e1a197d6366bcf2b95.camel@physik.fu-berlin.de>
Date: Sun, 07 Sep 2025 23:31:41 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>, Andreas Larsson
	 <andreas@...sler.com>
Cc: sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org, Anthony Yznaga
	 <anthony.yznaga@...cle.com>, René Rebe
 <rene@...ctcode.com>
Subject: Re: [PATCH v4 2/5] sparc: fix accurate exception reporting in
 copy_{from_to}_user for UltraSPARC III

Hi,

On Sun, 2025-09-07 at 20:33 +0200, John Paul Adrian Glaubitz wrote:
> I assume that cheetah_patch_cachetlbops has to be invoked on UltraSPARC III
> since there is other code depending on it. On the other hand, the TLB code
> on UltraSPARC III was heavily overhauled in 2016 [1] which was also followed
> by a bug fix [2].
> 
> Chances are there are still bugs in the code introduced in [1].
> 
> > [1] https://github.com/torvalds/linux/commit/a74ad5e660a9ee1d071665e7e8ad822784a2dc7f
> > [2] https://github.com/torvalds/linux/commit/d3c976c14ad8af421134c428b0a89ff8dd3bd8f8

I have reverted both commits. The machine boots until it tries to start
systemd when it locks up. So, I guess if there is a bug in the TLB code
it needs to be diagnosed differently.

Adrian

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