IB/mlx5/odp: 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 "mlx5_ib_page_fault_wq" queues work item &qp_pfault->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>
Acked-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx5/odp.c

@@ -782,8 +782,8 @@ void mlx5_ib_odp_remove_one(struct mlx5_ib_dev *ibdev)
 
 int __init mlx5_ib_odp_init(void)
 {
-	mlx5_ib_page_fault_wq =
-		create_singlethread_workqueue("mlx5_ib_page_faults");
+	mlx5_ib_page_fault_wq = alloc_ordered_workqueue("mlx5_ib_page_faults",
+							WQ_MEM_RECLAIM);
 	if (!mlx5_ib_page_fault_wq)
 		return -ENOMEM;