dm: use is_power_of_2

Replacing n & (n - 1) for power of 2 check by is_power_of_2(n)

Signed-off-by: vignesh babu <vignesh.babu@wipro.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

3 files changed, 6 insertions, 3 deletions

diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 6f60f307fae2..2b2ca371e20b 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -19,6 +19,7 @@
 #include <linux/time.h>
 #include <linux/vmalloc.h>
 #include <linux/workqueue.h>
+#include <linux/log2.h>
 
 #define DM_MSG_PREFIX "raid1"
 #define DM_IO_PAGES 64
@@ -995,7 +996,7 @@ static void free_context(struct mirror_set *ms, struct dm_target *ti,
 
 static inline int _check_region_size(struct dm_target *ti, uint32_t size)
 {
-        return !(size % (PAGE_SIZE >> 9) || (size & (size - 1)) ||
+        return !(size % (PAGE_SIZE >> 9) || !is_power_of_2(size) ||
                  size > ti->len);
 }
 
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 98a633f3d6b0..cee16fadd9ee 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
+#include <linux/log2.h>
 
 #include "dm-snap.h"
 #include "dm-bio-list.h"
@@ -415,7 +416,7 @@ static int set_chunk_size(struct dm_snapshot *s, const char *chunk_size_arg,
         chunk_size = round_up(chunk_size, PAGE_SIZE >> 9);
 
         /* Check chunk_size is a power of 2 */
-        if (chunk_size & (chunk_size - 1)) {
+        if (!is_power_of_2(chunk_size)) {
                 *error = "Chunk size is not a power of 2";
                 return -EINVAL;
         }
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 51f5e0760012..969944a8aba2 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -11,6 +11,7 @@
 #include <linux/blkdev.h>
 #include <linux/bio.h>
 #include <linux/slab.h>
+#include <linux/log2.h>
 
 #define DM_MSG_PREFIX "striped"
 
@@ -99,7 +100,7 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
         /*
          * chunk_size is a power of two
          */
-        if (!chunk_size || (chunk_size & (chunk_size - 1)) ||
+        if (!is_power_of_2(chunk_size) ||
             (chunk_size < (PAGE_SIZE >> SECTOR_SHIFT))) {
                 ti->error = "Invalid chunk size";
                 return -EINVAL;