[PATCH 09/12] workqueue: declare system_highpri_wq

[Lai Jiangshan <laijs@cn.fujitsu.com>]

system_highpri_wq is missed in workqueue.h, add it back.
also add a short comment for it.

CC: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
 include/linux/workqueue.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 2b58905..68b1d2a 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -294,6 +294,9 @@ enum {
  * short queue flush time.  Don't queue works which can run for too
  * long.
  *
+ * system_highpri_wq is similar to system_wq but services for urgent works
+ * and works will be processed in high priority workers.
+ *
  * system_long_wq is similar to system_wq but may host long running
  * works.  Queue flushing might take relatively long.
  *
@@ -306,6 +309,7 @@ enum {
  * freezable.
  */
 extern struct workqueue_struct *system_wq;
+extern struct workqueue_struct *system_highpri_wq;
 extern struct workqueue_struct *system_long_wq;
 extern struct workqueue_struct *system_unbound_wq;
 extern struct workqueue_struct *system_freezable_wq;
-- 
1.7.7.6