[PATCH] rsxx: Remove deprecated create_singlethread_workqueue

[PATCH] rsxx: Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

The workqueue "creg_wq" queues a single work item viz
&card->creg_ctrl.done_work and hence it doesn't require execution
ordering. Hence, alloc_workqueue has been used to replace the
deprecated create_singlethread_workqueue instance.

The workqueue "event_wq" queues a single work item viz &card->event_work
and hence it doesn't require execution ordering. Hence, alloc_workqueue
has been used to replace the deprecated create_singlethread_workqueue
instance.

The WQ_MEM_RECLAIM flag has been set in both cases to ensure forward
progress under memory pressure.

Since there are a fixed number of work items, explicit concurrency
limit is unnecessary here.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
---
 drivers/block/rsxx/core.c  | 3 ++-
 drivers/block/rsxx/cregs.c | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/block/rsxx/core.c b/drivers/block/rsxx/core.c
index 34997df..d46cab9 100644
--- a/drivers/block/rsxx/core.c
+++ b/drivers/block/rsxx/core.c
@@ -887,7 +887,8 @@ static int rsxx_pci_probe(struct pci_dev *dev,
 	}

 	/************* Setup Card Event Handler *************/
-	card->event_wq = create_singlethread_workqueue(DRIVER_NAME"_event");
+	card->event_wq = alloc_workqueue(DRIVER_NAME "_event", WQ_MEM_RECLAIM,
+					 0);
 	if (!card->event_wq) {
 		dev_err(CARD_TO_DEV(card), "Failed card event setup.\n");
 		goto failed_event_handler;
diff --git a/drivers/block/rsxx/cregs.c b/drivers/block/rsxx/cregs.c
index 926dce9..4f5a2e8 100644
--- a/drivers/block/rsxx/cregs.c
+++ b/drivers/block/rsxx/cregs.c
@@ -736,8 +736,8 @@ int rsxx_creg_setup(struct rsxx_cardinfo *card)
 {
 	card->creg_ctrl.active_cmd = NULL;

-	card->creg_ctrl.creg_wq =
-			create_singlethread_workqueue(DRIVER_NAME"_creg");
+	card->creg_ctrl.creg_wq = alloc_workqueue(DRIVER_NAME "_creg",
+						  WQ_MEM_RECLAIM, 0);
 	if (!card->creg_ctrl.creg_wq)
 		return -ENOMEM;

--
2.1.4

Re: [PATCH] rsxx: Remove deprecated create_singlethread_workqueue

[Tejun Heo]

On Tue, Aug 30, 2016 at 10:04:28PM +0530, Bhaktipriya Shridhar wrote:
> The workqueue "creg_wq" queues a single work item viz
> &card->creg_ctrl.done_work and hence it doesn't require execution
> ordering. Hence, alloc_workqueue has been used to replace the
> deprecated create_singlethread_workqueue instance.
> 
> The workqueue "event_wq" queues a single work item viz &card->event_work
> and hence it doesn't require execution ordering. Hence, alloc_workqueue
> has been used to replace the deprecated create_singlethread_workqueue
> instance.
> 
> The WQ_MEM_RECLAIM flag has been set in both cases to ensure forward
> progress under memory pressure.
> 
> Since there are a fixed number of work items, explicit concurrency
> limit is unnecessary here.
> 
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

-- 
tejun