tree 041b7b34242dc7f44b8bd6bf894839e778926b12
parent 8bee9dd953b69c634d1c9a3241a8b357469ad4aa
author Lai Jiangshan <jiangshan.ljs@antgroup.com> 1659087878 +0800
committer Tejun Heo <tj@kernel.org> 1659116942 -1000

workqueue: Avoid a false warning in unbind_workers()

Doing set_cpus_allowed_ptr() with wq_unbound_cpumask can be possible
fails and trigger the false warning.

Use cpu_possible_mask instead when wq_unbound_cpumask has no active CPUs.

It is very easy to trigger the warning:
  Set wq_unbound_cpumask to a small set of CPUs.
  Offline all the CPUs of wq_unbound_cpumask.
  Offline an extra CPU and trigger the warning.

Fixes: 10a5a651e3af ("workqueue: Restrict kworker in the offline CPU pool running on housekeeping CPUs")
Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Signed-off-by: Tejun Heo <tj@kernel.org>