linux-kernel - [RFC] IB/core: Remove create

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Date:	Tue, 7 Jun 2016 23:40:06 +0530
From:	Bhaktipriya Shridhar <bhaktipriya96@...il.com>
To:	Doug Ledford <dledford@...hat.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Matan Barak <matanb@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Erez Shitrit <erezsh@...lanox.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Bart Van Assche <bart.vanassche@...disk.com>
Cc:	Tejun Heo <tj@...nel.org>, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC] IB/core: Remove create_workqueue

alloc_workqueue replaces deprecated create_workqueue().

A dedicated workqueue has been used since cm.wq has workitem
&cm_id_priv->timewait_info->work.work (maps to cm_work_handler) is
involved in normal device operation. When a cm mad is received, it is
queued to a cm workqueue for processing. The queued work item references
the port and device on which the mad was received. WQ_MEM_RECLAIM has been
set to ensure forward progress under memory pressure.
Since there are only a fixed number of work
items, explicit concurrency limit is unnecessary here.

Is the workqueue being used on a memory reclaim path?
Does it require WQ_MEM_RECLAIM?

Thanks.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@...il.com>
---

 drivers/infiniband/core/cm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 1d92e09..e335d0b 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -4004,7 +4004,7 @@ static int __init ib_cm_init(void)
 		goto error1;
 	}

-	cm.wq = create_workqueue("ib_cm");
+	cm.wq = alloc_workqueue("ib_cm", WQ_MEM_RECLAIM, 0);
 	if (!cm.wq) {
 		ret = -ENOMEM;
 		goto error2;
--
2.1.4