linux-kernel - Re: [PATCH 07/14] sched: Fix do_set_cpus

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Message-ID: <990f3ce9-d7df-4344-863a-e4b71fe957c9@sirena.org.uk>
Date: Thu, 30 Oct 2025 12:47:57 +0000
From: Mark Brown <broonie@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: tj@...nel.org, linux-kernel@...r.kernel.org, mingo@...hat.com,
	juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
	mgorman@...e.de, vschneid@...hat.com, longman@...hat.com,
	hannes@...xchg.org, mkoutny@...e.com, void@...ifault.com,
	arighi@...dia.com, changwoo@...lia.com, cgroups@...r.kernel.org,
	sched-ext@...ts.linux.dev, liuwenfang@...or.com, tglx@...utronix.de
Subject: Re: [PATCH 07/14] sched: Fix do_set_cpus_allowed() locking

On Thu, Oct 30, 2025 at 10:07:15AM +0100, Peter Zijlstra wrote:
> On Thu, Oct 30, 2025 at 12:12:01AM +0000, Mark Brown wrote:

> > We're seeing lockups on some arm64 platforms in -next with the LTP
> > cpuhotplug02 test, the machine sits there repeatedly complaining that
> > RCU is stalled on IPIs:

> Did not this help?

>   https://lkml.kernel.org/r/20251027110133.GI3245006@noisy.programming.kicks-ass.net

It looks like that hadn't landed in yesterday's -next - it showed up
today and things do indeed look a lot happier, thanks!

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