linux-kernel - Re: [PATCH v2] Revert "x86/smp: Eliminate mwait_play_dead_cpuid

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Message-ID: <CAJZ5v0gbk33DutXy_F=teCqD28jn_Ob8unfpKZoaPzqkNzwHMQ@mail.gmail.com>
Date: Thu, 29 May 2025 17:39:05 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Dave Hansen <dave.hansen@...el.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>, x86 Maintainers <x86@...nel.org>, 
	LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...r.kernel.org>, 
	Len Brown <lenb@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...e.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, 
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>, 
	"Gautham R. Shenoy" <gautham.shenoy@....com>, Ingo Molnar <mingo@...hat.com>, 
	Todd Brandt <todd.e.brandt@...ux.intel.com>
Subject: Re: [PATCH v2] Revert "x86/smp: Eliminate mwait_play_dead_cpuid_hint()"

On Thu, May 29, 2025 at 4:25 PM Dave Hansen <dave.hansen@...el.com> wrote:
>
> On 5/29/25 06:40, Rafael J. Wysocki wrote:
> > This issue is hard to debug and potentially dangerous, so it needs to
> > be addressed as soon as possible in a way that will work for 6.15.y,
> > hence the revert.
>
> Ugh.
>
> I don't like the idea of reintroducing known buggy code. But the revert
> does seem like the lesser of the two evils.
>
> Seems like we should revert this for the time being and then try to fix
> it properly again.
>
> Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>

Thanks!

Applied.