linux-kernel - Re: [tip: x86/urgent] x86/cpu/amd: Fix workaround for erratum 1054

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Message-ID: <aAJBgCjGpvyI43E3@gmail.com>
Date: Fri, 18 Apr 2025 14:11:44 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Borislav Petkov <bp@...en8.de>
Cc: linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
	Sandipan Das <sandipan.das@....com>, x86@...nel.org
Subject: Re: [tip: x86/urgent] x86/cpu/amd: Fix workaround for erratum 1054

* Borislav Petkov <bp@...en8.de> wrote:

> > Fixes: 232afb557835 ("x86/CPU/AMD: Add X86_FEATURE_ZEN1")
> > Signed-off-by: Sandipan Das <sandipan.das@....com>
> > Signed-off-by: Ingo Molnar <mingo@...nel.org>
> > Link: https://lore.kernel.org/r/caa057a9d6f8ad579e2f1abaa71efbd5bd4eaf6d.1744956467.git.sandipan.das@amd.com
> 
> This needs
> 
> Cc: <stable@...nel.org>

No, it doesn't really 'need' a stable tag, it has a Fixes tag already, 
which gets processed by the -stable team.

Also, the bug is old, 1.5 years old:

  Date: Sat, 2 Dec 2023 12:50:23 +0100

plus the erratum is a perf-counters information quality bug affecting 
what appears to be a limited number of models, with the workaround 
likely incorporated in BIOS updates as well. Leave it up to the -stable 
team whether they think it's severe enough to backport it?

Thanks,

	Ingo