Hello, On Thu, May 28, 2020 at 09:27:03PM +0800, Lai Jiangshan wrote: > wq owns the ultimate or permanent references to itself by > owning references to wq->numa_pwq_tbl[node], wq->dfl_pwq. > The pwq's references keep the pwq in wq->pwqs. Yeah, regardless of who puts a wq the last time, the base reference is put by destroy_workqueue() and thus it's guaranteed that a wq can't be rcu freed without going through destroy_workqueue(). lol I'm undoing the revert. Thanks. -- tejun
