linux-kernel - Re: [PATCH/for-next 1/2] cgroup/cpuset: Defer housekeeping_update() call from CPU hotplug to task

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Message-ID: <494c63e6-4887-4bee-989d-8a9efda7f2c7@redhat.com>
Date: Wed, 28 Jan 2026 13:08:58 -0500
From: Waiman Long <llong@...hat.com>
To: Tejun Heo <tj@...nel.org>
Cc: Chen Ridong <chenridong@...weicloud.com>,
 Johannes Weiner <hannes@...xchg.org>, Michal Koutný
 <mkoutny@...e.com>, Ingo Molnar <mingo@...hat.com>,
 Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
 Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Frederic Weisbecker <frederic@...nel.org>,
 Thomas Gleixner <tglx@...utronix.de>, Shuah Khan <shuah@...nel.org>,
 cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH/for-next 1/2] cgroup/cpuset: Defer housekeeping_update()
 call from CPU hotplug to task_work


On 1/28/26 12:44 PM, Tejun Heo wrote:
> On Tue, Jan 27, 2026 at 11:42:50PM -0500, Waiman Long wrote:
>> +static void isolation_task_work_fn(struct callback_head *cb)
>> +{
>> +	cpuset_full_lock();
>> +	__update_isolation_cpumasks(true);
>> +	cpuset_full_lock();
>                      ^
>                      unlock?
>
> Thanks.
>
Sorry about that, will fix it. That change was removed in the 2nd patch. 
That is why the series still worked as expected.

Thanks,
Longman