linux-kernel - Re: [PATCH AUTOSEL 5.15 11/12] x86/barrier: Do not serialize MSR accesses on AMD

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Message-ID: <Z0mNTEw2vK1nJpOo@duo.ucw.cz>
Date: Fri, 29 Nov 2024 10:45:48 +0100
From: Pavel Machek <pavel@...x.de>
To: Borislav Petkov <bp@...en8.de>
Cc: Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
	dave.hansen@...ux.intel.com, x86@...nel.org, puwen@...on.cn,
	seanjc@...gle.com, kim.phillips@....com, jmattson@...gle.com,
	babu.moger@....com, peterz@...radead.org,
	rick.p.edgecombe@...el.com, brgerst@...il.com, ashok.raj@...el.com,
	mjguzik@...il.com, jpoimboe@...nel.org, nik.borisov@...e.com,
	aik@....com, vegard.nossum@...cle.com,
	daniel.sneddon@...ux.intel.com, acdunlap@...gle.com,
	Erwan Velu <erwanaliasr1@...il.com>, pavel@...x.de
Subject: Re: [PATCH AUTOSEL 5.15 11/12] x86/barrier: Do not serialize MSR
 accesses on AMD

Hi!

> > You've missed the 5.10 mail :)
> 
> You mean in the flood? ;-P
> 
> > Pavel objected to it so I've dropped it: https://lore.kernel.org/all/Zbli7QIGVFT8EtO4@sashalap/
> 
> So we're not backporting those anymore? But everything else? :-P
> 
> And 5.15 has it already...
> 
> Frankly, with the amount of stuff going into stable, I see no problem with
> backporting such patches. Especially if the people using stable kernels will
> end up backporting it themselves and thus multiply work. I.e., Erwan's case.

Well, some people would prefer -stable to only contain fixes for
critical things, as documented.

stable-kernel-rules.rst:

 - It must fix a problem that causes a build error (but not for things
   marked CONFIG_BROKEN), an oops, a hang, data corruption, a real
   security issue, or some "oh, that's not good" issue.  In short, something
   critical.

Now, you are right that reality and documentation are not exactly
"aligned". I don't care much about which one is fixed, but I'd really
like them to match (because that's what our users expect).

Best regards,
								Pavel
-- 
DENX Software Engineering GmbH,        Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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