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

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Date:	Thu, 17 Apr 2014 23:49:37 +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>
Subject: [PATCH next 3/4] blk-mq: user (1 << order) to implement order_to_size()

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 baff2d0..1eff3d9 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 (1 << order) * PAGE_SIZE;
 }
 
 static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
-- 
1.7.9.5

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