MD: use is_power_of_2 macro

Make use of is_power_of_2 macro.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index f0769b3..7fc028f 100644 (file)
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -651,7 +651,7 @@ static int bitmap_read_sb(struct bitmap *bitmap)
                reason = "unrecognized superblock version";
        else if (chunksize < 512)
                reason = "bitmap chunksize too small";
-       else if ((1 << ffz(~chunksize)) != chunksize)
+       else if (!is_power_of_2(chunksize))
                reason = "bitmap chunksize not a power of 2";
        else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT)
                reason = "daemon sleep period out of range";