[PATCH 4/5] workqueue: use system_highpri_wq for highpri workers in rebind_workers()

[Joonsoo Kim]

In rebind_workers(), we do inserting a work to rebind to cpu for busy workers.
Currently, in this case, we use only system_wq. This makes a possible
error situation as there is mismatch between cwq->pool and worker->pool.

To prevent this, we should use system_highpri_wq for highpri worker
to match theses. This implements it.

Signed-off-by: Joonsoo Kim <js1304@xxxxxxxxx>

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index f69f094..e0e1d41 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -489,6 +489,11 @@ static int worker_pool_pri(struct worker_pool *pool)
 	return pool - pool->gcwq->pools;
 }
 
+static struct workqueue_struct *get_pool_system_wq(struct worker_pool *pool)
+{
+	return worker_pool_pri(pool) ? system_highpri_wq : system_wq;
+}
+
 static struct global_cwq *get_gcwq(unsigned int cpu)
 {
 	if (cpu != WORK_CPU_UNBOUND)
@@ -1450,9 +1455,10 @@ retry:
 
 		/* wq doesn't matter, use the default one */
 		debug_work_activate(rebind_work);
-		insert_work(get_cwq(gcwq->cpu, system_wq), rebind_work,
-			    worker->scheduled.next,
-			    work_color_to_flags(WORK_NO_COLOR));
+		insert_work(
+			get_cwq(gcwq->cpu, get_pool_system_wq(worker->pool)),
+			rebind_work, worker->scheduled.next,
+			work_color_to_flags(WORK_NO_COLOR));
 	}
 }
 
-- 
1.7.9.5

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