linux-kernel - Re: stable: commit "cpuidle: menu: Avoid discarding useful information" causes regressions

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Message-ID: <CAJZ5v0iF0NE07KcK4J2_Pko-1p2wuQXjLSD7iOTBr4QcDCX4vA@mail.gmail.com>
Date: Tue, 14 Oct 2025 16:02:05 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Christian Loehle <christian.loehle@....com>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>, Sasha Levin <sashal@...nel.org>, 
	Daniel Lezcano <daniel.lezcano@...aro.org>, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Tomasz Figa <tfiga@...omium.org>, stable@...r.kernel.org
Subject: Re: stable: commit "cpuidle: menu: Avoid discarding useful
 information" causes regressions

On Tue, Oct 14, 2025 at 3:59 PM Christian Loehle
<christian.loehle@....com> wrote:
>
> On 10/14/25 14:56, Sergey Senozhatsky wrote:
> > On (25/10/14 15:47), Rafael J. Wysocki wrote:
> >> On Tue, Oct 14, 2025 at 12:23 PM Sergey Senozhatsky
> >> <senozhatsky@...omium.org> wrote:
> >>>
> >>>> Any details would be much appreciated.
> >>>> How do the idle state usages differ with and without
> >>>> "cpuidle: menu: Avoid discarding useful information"?
> >>>> What do the idle states look like in your platform?
> >>>
> >>> Sure, I can run tests.
> >>
> >> Would it be possible to check if the mainline has this issue?  That
> >> is, compare the benchmark results on unmodified 6.17 (say) and on 6.17
> >> with commit 85975daeaa4 reverted?
> >
> > I don't think mainline kernel can run on those devices (due to
> > a bunch of downstream patches).  Best bet is 6.12, I guess.
>
> Depending on what Rafael is expecting here you might just get
> away with copying menu.c from mainline, the interactions to other
> subsystems are limited fortunately.

Yeah, that'd be sufficiently close.