linux-kernel - [PATCH 4/4] elevator: use list_is

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Date:	Thu, 10 Dec 2015 22:20:00 +0800
From:	Geliang Tang <geliangtang@....com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Geliang Tang <geliangtang@....com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jan Kara <jack@...e.cz>, Josef Bacik <jbacik@...com>,
	Josh Triplett <josh@...htriplett.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"David S. Miller" <davem@...emloft.net>,
	live-patching@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, netdev@...r.kernel.org,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] elevator: use list_is_{first,last}

For better readability, use list_is_{first,last}() instead of open-coded.

Signed-off-by: Geliang Tang <geliangtang@....com>
---
 block/noop-iosched.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/noop-iosched.c b/block/noop-iosched.c
index a163c48..d44326e 100644
--- a/block/noop-iosched.c
+++ b/block/noop-iosched.c
@@ -44,7 +44,7 @@ noop_former_request(struct request_queue *q, struct request *rq)
 {
 	struct noop_data *nd = q->elevator->elevator_data;
 
-	if (rq->queuelist.prev == &nd->queue)
+	if (list_is_first(&rq->queuelist, &nd->queue))
 		return NULL;
 	return list_prev_entry(rq, queuelist);
 }
@@ -54,7 +54,7 @@ noop_latter_request(struct request_queue *q, struct request *rq)
 {
 	struct noop_data *nd = q->elevator->elevator_data;
 
-	if (rq->queuelist.next == &nd->queue)
+	if (list_is_last(&rq->queuelist, &nd->queue))
 		return NULL;
 	return list_next_entry(rq, queuelist);
 }
-- 
2.5.0


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