From: Vignesh Babu BM <vignesh.babu@wipro.com>

Replace (n & (n-1)) in the context of power of 2 checks with is_power_of_2

Signed-off-by: vignesh babu <vignesh.babu@wipro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/block_dev.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -puN fs/block_dev.c~is_power_of_2-in-fs-block_devc fs/block_dev.c
--- a/fs/block_dev.c~is_power_of_2-in-fs-block_devc
+++ a/fs/block_dev.c
@@ -22,6 +22,7 @@
 #include <linux/mount.h>
 #include <linux/uio.h>
 #include <linux/namei.h>
+#include <linux/log2.h>
 #include <asm/uaccess.h>
 #include "internal.h"
 
@@ -65,7 +66,7 @@ static void kill_bdev(struct block_devic
 int set_blocksize(struct block_device *bdev, int size)
 {
 	/* Size must be a power of two, and between 512 and PAGE_SIZE */
-	if (size > PAGE_SIZE || size < 512 || (size & (size-1)))
+	if (size > PAGE_SIZE || size < 512 || !is_power_of_2(size))
 		return -EINVAL;
 
 	/* Size cannot be smaller than the size supported by the device */
_