linux-kernel - [PATCH v3 07/10] zram: simplify and optimize dev_to

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Date:	Fri,  7 Jun 2013 00:07:28 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Minchan Kim <minchan@...nel.org>,
	Jerome Marchand <jmarchan@...hat.com>
Cc:	Jiang Liu <jiang.liu@...wei.com>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 07/10] zram: simplify and optimize dev_to_zram()

Simplify and optimize dev_to_zram() without walking the zram_devices
array.

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
---
 drivers/staging/zram/zram_sysfs.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/zram/zram_sysfs.c b/drivers/staging/zram/zram_sysfs.c
index dc76a3d..e239d94 100644
--- a/drivers/staging/zram/zram_sysfs.c
+++ b/drivers/staging/zram/zram_sysfs.c
@@ -30,18 +30,9 @@ static u64 zram_stat64_read(struct zram *zram, u64 *v)
 	return val;
 }
 
-static struct zram *dev_to_zram(struct device *dev)
+static inline struct zram *dev_to_zram(struct device *dev)
 {
-	int i;
-	struct zram *zram = NULL;
-
-	for (i = 0; i < zram_get_num_devices(); i++) {
-		zram = &zram_devices[i];
-		if (disk_to_dev(zram->disk) == dev)
-			break;
-	}
-
-	return zram;
+	return (struct zram *)dev_to_disk(dev)->private_data;
 }
 
 static ssize_t disksize_show(struct device *dev,
-- 
1.8.1.2

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