Add pool_workqueue->refcnt along with get/put_pwq(). Both per-cpu and
unbound pwqs have refcnts and any work item inserted on a pwq
increments the refcnt which is dropped when the work item finishes.
For per-cpu pwqs the base ref is never dropped and destroy_workqueue()
frees the pwqs as before.
Add pool_workqueue-refcnt along with get/put_pwq(). Both per-cpu and
unbound pwqs have refcnts and any work item inserted on a pwq
increments the refcnt which is dropped when the work item finishes.
For per-cpu pwqs the base ref is never dropped and destroy_workqueue()
frees the pwqs as before.
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