linux-kernel - Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated create_singlethread

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Date:   Wed, 9 Nov 2016 15:23:59 -0500
From:   "J. Bruce Fields" <bfields@...ldses.org>
To:     Jeff Layton <jlayton@...chiereds.net>
Cc:     Tejun Heo <tj@...nel.org>,
        Bhaktipriya Shridhar <bhaktipriya96@...il.com>,
        linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] fs/nfsd/nfs4callback: Remove deprecated
 create_singlethread_workqueue

On Wed, Nov 09, 2016 at 02:47:24PM -0500, J. Bruce Fields wrote:
> For now I wish we could just like to continue assuming the workqueue
> processes only one item at a time.  Do we have that now, or do we need
> to switch to (looking at workqueue.h...) alloc_ordered workqueue()?

Oh, wait, I missed the _ordered_ in:

	#define create_singlethread_workqueue(name) \
	        alloc_ordered_workqueue("%s", __WQ_LEGACY | WQ_MEM_RECLAIM, name)

So our existing create_singlethread_workqueue is fine--but we probably
don't need those flags:

--b.

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 211dc2aed8e1..eb78109d666c 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1061,7 +1061,7 @@ static const struct rpc_call_ops nfsd4_cb_ops = {
 
 int nfsd4_create_callback_queue(void)
 {
-	callback_wq = create_singlethread_workqueue("nfsd4_callbacks");
+	callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0);
 	if (!callback_wq)
 		return -ENOMEM;
 	return 0;