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workqueue: Restrict kworker in the offline CPU pool running on housekeeping CPUs

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When a CPU is going offline, all workers on the CPU's pool will have their
cpus_allowed cleared to cpu_possible_mask and can run on any CPUs including
the isolated ones. Instead, set cpus_allowed to wq_unbound_cpumask so that
the can avoid isolated CPUs.

Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Zqiang 2022-03-31 13:57:17 +08:00 committed by Tejun Heo
parent 59f0c2447e
commit 10a5a651e3
1 changed files with 1 additions and 1 deletions
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kernel/workqueue.c
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@ -5001,7 +5001,7 @@ static void unbind_workers(int cpu)
for_each_pool_worker(worker, pool) { for_each_pool_worker(worker, pool) {
kthread_set_per_cpu(worker->task, -1); kthread_set_per_cpu(worker->task, -1);
WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, cpu_possible_mask) < 0); WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, wq_unbound_cpumask) < 0);
} }
mutex_unlock(&wq_pool_attach_mutex); mutex_unlock(&wq_pool_attach_mutex);