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

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Message-ID: <a9857ceb-bf3e-4229-9c2f-ecab6eb2e1b0@arm.com>
Date: Tue, 14 Oct 2025 14:58:50 +0100
From: Christian Loehle <christian.loehle@....com>
To: Sergey Senozhatsky <senozhatsky@...omium.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>
Cc: "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 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.