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

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Message-ID: <ry5gjxocyzo6waonjyc7hgvo7bc6riqpmy6l3f2au7dm4j5dtd@shma7ngcqjuk>
Date: Thu, 16 Oct 2025 13:54:34 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>, 
	Christian Loehle <christian.loehle@....com>, "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 (25/10/15 15:08), Rafael J. Wysocki wrote:
> On Wed, Oct 15, 2025 at 3:56 AM Sergey Senozhatsky
> <senozhatsky@...omium.org> wrote:
> >
> > On (25/10/14 16:02), Rafael J. Wysocki wrote:
> > > > >> 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.
> >
> > Test results for menu.c from linux-next are within regressed range: 78.5
> 
> So please check if the attached patch makes any difference.

>From what I can tell the patch fixes it!