On 04/16/2014 12:47 AM, Tejun Heo wrote: > On Fri, Mar 28, 2014 at 08:07:58PM +0800, Lai Jiangshan wrote: >> +static inline void get_unbound_pwq(struct pool_workqueue *pwq) >> +{ >> + if (pwq->wq->flags & WQ_UNBOUND) >> + get_pwq(pwq); >> +} >> + >> /** >> * put_pwq - put a pool_workqueue reference >> * @pwq: pool_workqueue to put >> @@ -1075,6 +1081,12 @@ static void put_pwq(struct pool_workqueue *pwq) >> schedule_work(&pwq->unbound_release_work); >> } >> >> +static inline void put_unbound_pwq(struct pool_workqueue *pwq) >> +{ >> + if (pwq->wq->flags & WQ_UNBOUND) >> + put_pwq(pwq); >> +} > > Ugh... please drop these helpers. > >> + get_unbound_pwq(pwq); > > Why not just do get_pwq() here?
V1 patch just do get_pwq(). > > Thanks. > 1) Our aim is to protect unbound pwq, not percpu pwq which can't be be protected by get_pwq(). 2) get_pwq() will make reviewers confused/surprised, destroy_workqueue() may destroy percpu pwqs with ref > 1. At least we need to add more comments explain this behavior. Origin comments: /* * The base ref is never dropped on per-cpu pwqs. Directly * free the pwqs and wq. */ 3) get_unbound_pwq() self document. Thanks, Lai -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/