linux-kernel - [PATCH v1 next 3/4] blk-mq: user (1 << order) to implement order_to

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Message-Id: <1397901619-27226-4-git-send-email-tom.leiming@gmail.com>
Date:	Sat, 19 Apr 2014 18:00:18 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Cc:	Christoph Hellwig <hch@....de>, Ming Lei <tom.leiming@...il.com>,
	Jörg-Volker Peetz <jvpeetz@....de>,
	Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH v1 next 3/4] blk-mq: user (1 << order) to implement order_to_size()

Cc: Jörg-Volker Peetz <jvpeetz@....de>
Cc: Max Filippov <jcmvbkbc@...il.com>
Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
 block/blk-mq.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index c277797..3a560a4 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1130,12 +1130,7 @@ static void blk_mq_free_rq_map(struct blk_mq_tag_set *set,
 
 static size_t order_to_size(unsigned int order)
 {
-	size_t ret = PAGE_SIZE;
-
-	while (order--)
-		ret *= 2;
-
-	return ret;
+	return (size_t)PAGE_SIZE << order;
 }
 
 static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
-- 
1.7.9.5

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