IB/qib: Remove deprecated create_singlethread_workqueue

alloc_ordered_workqueue() with WQ_MEM_RECLAIM set, replaces
deprecated create_singlethread_workqueue(). This is the identity
conversion.

The workqueue "qib" queues work item &priv->s_work. It has been
identity converted.

WQ_MEM_RECLAIM has been set to ensure forward progress under
memory pressure.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Tested-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Acked-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/qib/qib_init.c

@@ -614,8 +614,8 @@ static int qib_create_workqueues(struct qib_devdata *dd)
 
 			snprintf(wq_name, sizeof(wq_name), "qib%d_%d",
 				dd->unit, pidx);
-			ppd->qib_wq =
-				create_singlethread_workqueue(wq_name);
+			ppd->qib_wq = alloc_ordered_workqueue(wq_name,
+							      WQ_MEM_RECLAIM);
 			if (!ppd->qib_wq)
 				goto wq_error;
 		}