kernel/workqueue: Let rescuers follow unbound wq cpumask changes

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When workqueue cpumask changes are committed the associated rescuer (if
one exists) affinity is not touched and this might be a problem down the
line for isolated setups.

Make sure rescuers affinity is updated every time a workqueue cpumask
changes, so that rescuers can't break isolation.

 [longman: set_cpus_allowed_ptr() will block until the designated task
  is enqueued on an allowed CPU, no wake_up_process() needed. Also use
  the unbound_effective_cpumask() helper as suggested by Tejun.]

Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

...

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Juri Lelli 2024-02-08 11:10:13 -05:00 • committed by Tejun Heo

parent 4c065dbce1

commit d64f2fa064

1 changed files with 5 additions and 0 deletions

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kernel/workqueue.c

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