linux-kernel - [PATCH]is_power_of

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Date:	Wed, 13 Jun 2007 09:33:13 +0530
From:	vignesh babu <vignesh.babu@...ro.com>
To:	zippel@...ux-m68k.org
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Kernel Janitors List <kernel-janitors@...ts.osdl.org>
Subject: [PATCH]is_power_of_2-hfs/mdb.c


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

Signed-off-by: vignesh babu <vignesh.babu@...ro.com>
--- 
diff --git a/fs/hfs/mdb.c b/fs/hfs/mdb.c
index b4651e1..8bda11d 100644
--- a/fs/hfs/mdb.c
+++ b/fs/hfs/mdb.c
@@ -11,6 +11,7 @@
 #include <linux/cdrom.h>
 #include <linux/genhd.h>
 #include <linux/nls.h>
+#include <linux/log2.h>
 
 #include "hfs_fs.h"
 #include "btree.h"
@@ -106,7 +107,7 @@ int hfs_mdb_get(struct super_block *sb)
 
 	size = min(HFS_SB(sb)->alloc_blksz, (u32)PAGE_SIZE);
 	/* size must be a multiple of 512 */
-	while (size & (size - 1))
+	while (!is_power_of_2(size))
 		size -= HFS_SECTOR_SIZE;
 	sect = be16_to_cpu(mdb->drAlBlSt) + part_start;
 	/* align block size to first sector */

-- 
Vignesh Babu BM 
_____________________________________________________________ 
"Why is it that every time I'm with you, makes me believe in magic?"

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