From: Vignesh Babu <vignesh.babu@wipro.com>
Date: Tue, 12 Jun 2007 05:01:05 +0000 (+0530)
Subject: UBI: use is_power_of_2()
X-Git-Tag: v3.12-rc1~28089^2~13
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7753f1692f53d82b4cc08084462b0fd2803c1f04;p=kernel%2Fkernel-generic.git

UBI: use is_power_of_2()

Replacing (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: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 08ca214..eb8b55d 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -33,6 +33,7 @@
 #include <linux/moduleparam.h>
 #include <linux/stringify.h>
 #include <linux/stat.h>
+#include <linux/log2.h>
 #include "ubi.h"
 
 /* Maximum length of the 'mtd=' parameter */
@@ -422,8 +423,7 @@ static int io_init(struct ubi_device *ubi)
 	ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft;
 
 	/* Make sure minimal I/O unit is power of 2 */
-	if (ubi->min_io_size == 0 ||
-	    (ubi->min_io_size & (ubi->min_io_size - 1))) {
+	if (!is_power_of_2(ubi->min_io_size)) {
 		ubi_err("bad min. I/O unit");
 		return -EINVAL;
 	}