From: Jonathan Brassow <jbrassow@redhat.com>
Date: Wed, 8 Jun 2011 23:01:10 +0000 (-0500)
Subject: MD: use is_power_of_2 macro
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=d744540cd39e93976c4c8401e140232444ef3b0b;p=openwrt%2Fstaging%2Fblogic.git

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 f0769b34d656..7fc028f9701e 100644
--- 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";