workqueue: make it clear that WQ_DRAINING is an internal flag

We're gonna add another internal WQ flag.  Let's make the distinction
clear.  Prefix WQ_DRAINING with __ and move it to bit 16.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index e152394..1751ec4 100644 (file)
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -294,7 +294,7 @@ enum {
        WQ_HIGHPRI              = 1 << 4, /* high priority */
        WQ_CPU_INTENSIVE        = 1 << 5, /* cpu instensive workqueue */
 
-       WQ_DRAINING             = 1 << 6, /* internal: workqueue is draining */
+       __WQ_DRAINING           = 1 << 16, /* internal: workqueue is draining */
 
        WQ_MAX_ACTIVE           = 512,    /* I like 512, better ideas? */
        WQ_MAX_UNBOUND_PER_CPU  = 4,      /* 4 * #cpus for unbound wq */

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 2a67fbb..590f4d0 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1225,7 +1225,7 @@ static void __queue_work(int cpu, struct workqueue_struct *wq,
        debug_work_activate(work);
 
        /* if dying, only works from the same workqueue are allowed */
-       if (unlikely(wq->flags & WQ_DRAINING) &&
+       if (unlikely(wq->flags & __WQ_DRAINING) &&
            WARN_ON_ONCE(!is_chained_work(wq)))
                return;
 retry:
@@ -2763,11 +2763,11 @@ void drain_workqueue(struct workqueue_struct *wq)
        /*
         * __queue_work() needs to test whether there are drainers, is much
         * hotter than drain_workqueue() and already looks at @wq->flags.
-        * Use WQ_DRAINING so that queue doesn't have to check nr_drainers.
+        * Use __WQ_DRAINING so that queue doesn't have to check nr_drainers.
         */
        spin_lock_irq(&workqueue_lock);
        if (!wq->nr_drainers++)
-               wq->flags |= WQ_DRAINING;
+               wq->flags |= __WQ_DRAINING;
        spin_unlock_irq(&workqueue_lock);
 reflush:
        flush_workqueue(wq);
@@ -2795,7 +2795,7 @@ reflush:
 
        spin_lock(&workqueue_lock);
        if (!--wq->nr_drainers)
-               wq->flags &= ~WQ_DRAINING;
+               wq->flags &= ~__WQ_DRAINING;
        spin_unlock(&workqueue_lock);
 
        local_irq_enable();