From: Tejun Heo Date: Tue, 11 Jan 2011 14:58:49 +0000 (+0100) Subject: workqueue: note the nested NOT_RUNNING test in worker_clr_flags() isn't a noop X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=42c025f3de9042d9c9abd9a6f6205d1a0f4bcadf;p=deliverable%2Flinux.git workqueue: note the nested NOT_RUNNING test in worker_clr_flags() isn't a noop The nested NOT_RUNNING test in worker_clr_flags() is slightly misleading in that if NOT_RUNNING were a single flag the nested test would be always %true and thus noop. Add a comment noting that the test isn't a noop. Signed-off-by: Tejun Heo Cc: Hillf Danton Cc: Andrew Morton --- diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 930c2390b77e..11869faa6819 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -768,7 +768,11 @@ static inline void worker_clr_flags(struct worker *worker, unsigned int flags) worker->flags &= ~flags; - /* if transitioning out of NOT_RUNNING, increment nr_running */ + /* + * If transitioning out of NOT_RUNNING, increment nr_running. Note + * that the nested NOT_RUNNING is not a noop. NOT_RUNNING is mask + * of multiple flags, not a single flag. + */ if ((flags & WORKER_NOT_RUNNING) && (oflags & WORKER_NOT_RUNNING)) if (!(worker->flags & WORKER_NOT_RUNNING)) atomic_inc(get_gcwq_nr_running(gcwq->cpu));