linux-kernel - Re: [PATCH v3 3/3] softirq: Use a dedicated thread for timer wakeups on PREEMPT

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Message-ID: <afbd1a03-0458-4c06-a96a-2d5f34e2632e@siemens.com>
Date: Tue, 2 Dec 2025 13:39:56 +0100
From: Jan Kiszka <jan.kiszka@...mens.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
 stable-rt <stable-rt@...r.kernel.org>, "Paul E. McKenney"
 <paulmck@...nel.org>, Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Davidlohr Bueso <dave@...olabs.net>,
 Frederic Weisbecker <frederic@...nel.org>, Ingo Molnar <mingo@...nel.org>,
 Josh Triplett <josh@...htriplett.org>, Thomas Gleixner <tglx@...utronix.de>,
 Florian Bezdeka <florian.bezdeka@...mens.com>, Pavel Machek <pavel@...x.de>
Subject: Re: [PATCH v3 3/3] softirq: Use a dedicated thread for timer wakeups
 on PREEMPT_RT.

On 02.12.25 09:24, Sebastian Andrzej Siewior wrote:
> On 2025-12-01 22:51:50 [+0100], Jan Kiszka wrote:
>> How should we handle this? Consider 6.12 mainline with -rt and cgroups
>> as potentially broken, asking people to user 6.12-rt? Or port this back?
> 
> If you have everything in v6.12 for an useable RT system and this is the
> only missing piece I could ask the stable nicely to backport this.
> 

Given that this is a fix for potential lock-up... Does it have
dependencies? The other two patches in this series are optimizations
only, or should they better join the backport?

Jan

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