workqueue: Protects wq_unbound_cpumask with wq_pool_attach_mutex

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[ Upstream commit 99c621ef24 ]

When unbind_workers() reads wq_unbound_cpumask to set the affinity of
freshly-unbound kworkers, it only holds wq_pool_attach_mutex. This isn't
sufficient as wq_unbound_cpumask is only protected by wq_pool_mutex.

Make wq_unbound_cpumask protected with wq_pool_attach_mutex and also
remove the need of temporary saved_cpumask.

Fixes: 10a5a651e3 ("workqueue: Restrict kworker in the offline CPU pool running on housekeeping CPUs")
Reported-by: Valentin Schneider <vschneid@redhat.com>
Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Lai Jiangshan 2023-01-12 16:14:27 +00:00 • committed by Greg Kroah-Hartman

parent 807e3596ef

commit 68b2e5d84a

1 changed files with 16 additions and 25 deletions

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kernel/workqueue.c

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