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 (file)
--- 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;
        }