diff --git a/[refs] b/[refs]
index eee086809004..d68d7e65dec8 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2f2e09eb15849562aede80ed007658e4504ded26
+refs/heads/master: f4afb4f4e3e9af626ad695c87e4f9aaa780b29ec
diff --git a/trunk/fs/ext4/balloc.c b/trunk/fs/ext4/balloc.c
index d0f13eada0ed..58339393fa6e 100644
--- a/trunk/fs/ext4/balloc.c
+++ b/trunk/fs/ext4/balloc.c
@@ -682,11 +682,15 @@ ext4_fsblk_t ext4_count_free_clusters(struct super_block *sb)
 
 static inline int test_root(ext4_group_t a, int b)
 {
-	int num = b;
-
-	while (a > num)
-		num *= b;
-	return num == a;
+	while (1) {
+		if (a < b)
+			return 0;
+		if (a == b)
+			return 1;
+		if ((a % b) != 0)
+			return 0;
+		a = a / b;
+	}
 }
 
 static int ext4_group_sparse(ext4_group_t group)