diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/workqueue.c | 47 |
1 files changed, 28 insertions, 19 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 6fa847c5c5e9..558733801ac0 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -601,7 +601,7 @@ struct task_struct *wq_worker_sleeping(struct task_struct *task, /** * worker_set_flags - set worker flags and adjust nr_running accordingly - * @worker: worker to set flags for + * @worker: self * @flags: flags to set * @wakeup: wakeup an idle worker if necessary * @@ -609,14 +609,16 @@ struct task_struct *wq_worker_sleeping(struct task_struct *task, * nr_running becomes zero and @wakeup is %true, an idle worker is * woken up. * - * LOCKING: - * spin_lock_irq(gcwq->lock). + * CONTEXT: + * spin_lock_irq(gcwq->lock) */ static inline void worker_set_flags(struct worker *worker, unsigned int flags, bool wakeup) { struct global_cwq *gcwq = worker->gcwq; + WARN_ON_ONCE(worker->task != current); + /* * If transitioning into NOT_RUNNING, adjust nr_running and * wake up an idle worker as necessary if requested by @@ -639,19 +641,21 @@ static inline void worker_set_flags(struct worker *worker, unsigned int flags, /** * worker_clr_flags - clear worker flags and adjust nr_running accordingly - * @worker: worker to set flags for + * @worker: self * @flags: flags to clear * * Clear @flags in @worker->flags and adjust nr_running accordingly. * - * LOCKING: - * spin_lock_irq(gcwq->lock). + * CONTEXT: + * spin_lock_irq(gcwq->lock) */ static inline void worker_clr_flags(struct worker *worker, unsigned int flags) { struct global_cwq *gcwq = worker->gcwq; unsigned int oflags = worker->flags; + WARN_ON_ONCE(worker->task != current); + worker->flags &= ~flags; /* if transitioning out of NOT_RUNNING, increment nr_running */ @@ -1073,7 +1077,8 @@ static void worker_enter_idle(struct worker *worker) BUG_ON(!list_empty(&worker->entry) && (worker->hentry.next || worker->hentry.pprev)); - worker_set_flags(worker, WORKER_IDLE, false); + /* can't use worker_set_flags(), also called from start_worker() */ + worker->flags |= WORKER_IDLE; gcwq->nr_idle++; worker->last_active = jiffies; @@ -1086,6 +1091,10 @@ static void worker_enter_idle(struct worker *worker) jiffies + IDLE_WORKER_TIMEOUT); } else wake_up_all(&gcwq->trustee_wait); + + /* sanity check nr_running */ + WARN_ON_ONCE(gcwq->nr_workers == gcwq->nr_idle && + atomic_read(get_gcwq_nr_running(gcwq->cpu))); } /** @@ -1270,7 +1279,7 @@ fail: */ static void start_worker(struct worker *worker) { - worker_set_flags(worker, WORKER_STARTED, false); + worker->flags |= WORKER_STARTED; worker->gcwq->nr_workers++; worker_enter_idle(worker); wake_up_process(worker->task); @@ -1300,7 +1309,7 @@ static void destroy_worker(struct worker *worker) gcwq->nr_idle--; list_del_init(&worker->entry); - worker_set_flags(worker, WORKER_DIE, false); + worker->flags |= WORKER_DIE; spin_unlock_irq(&gcwq->lock); @@ -2979,10 +2988,10 @@ static int __cpuinit trustee_thread(void *__gcwq) gcwq->flags |= GCWQ_MANAGING_WORKERS; list_for_each_entry(worker, &gcwq->idle_list, entry) - worker_set_flags(worker, WORKER_ROGUE, false); + worker->flags |= WORKER_ROGUE; for_each_busy_worker(worker, i, pos, gcwq) - worker_set_flags(worker, WORKER_ROGUE, false); + worker->flags |= WORKER_ROGUE; /* * Call schedule() so that we cross rq->lock and thus can @@ -2995,12 +3004,12 @@ static int __cpuinit trustee_thread(void *__gcwq) spin_lock_irq(&gcwq->lock); /* - * Sched callbacks are disabled now. gcwq->nr_running should - * be zero and will stay that way, making need_more_worker() - * and keep_working() always return true as long as the - * worklist is not empty. + * Sched callbacks are disabled now. Zap nr_running. After + * this, nr_running stays zero and need_more_worker() and + * keep_working() are always true as long as the worklist is + * not empty. */ - WARN_ON_ONCE(atomic_read(get_gcwq_nr_running(gcwq->cpu)) != 0); + atomic_set(get_gcwq_nr_running(gcwq->cpu), 0); spin_unlock_irq(&gcwq->lock); del_timer_sync(&gcwq->idle_timer); @@ -3046,7 +3055,7 @@ static int __cpuinit trustee_thread(void *__gcwq) worker = create_worker(gcwq, false); spin_lock_irq(&gcwq->lock); if (worker) { - worker_set_flags(worker, WORKER_ROGUE, false); + worker->flags |= WORKER_ROGUE; start_worker(worker); } } @@ -3085,8 +3094,8 @@ static int __cpuinit trustee_thread(void *__gcwq) * operations. Use a separate flag to mark that * rebinding is scheduled. */ - worker_set_flags(worker, WORKER_REBIND, false); - worker_clr_flags(worker, WORKER_ROGUE); + worker->flags |= WORKER_REBIND; + worker->flags &= ~WORKER_ROGUE; /* queue rebind_work, wq doesn't matter, use the default one */ if (test_and_set_bit(WORK_STRUCT_PENDING_BIT, |