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workqueue: Put PWQ allocation and WQ enlistment in the same lock C.S.
The PWQ allocation and WQ enlistment are not within the same lock-held critical section; therefore, their states can become out of sync when the user modifies the unbound mask or if CPU hotplug events occur in the interim since those operations only update the WQs that are already in the list. Make the PWQ allocation and WQ enlistment atomic. Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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