--- ./drivers/md/bitmap.c.orig	2006-09-21 16:10:17.000000000 -0400
+++ ./drivers/md/bitmap.c	2006-09-21 16:12:16.000000000 -0400
@@ -1578,8 +1578,7 @@ int bitmap_create(mddev_t *mddev)
 	if (err)
 		goto error;
 
-	bitmap->chunkshift = find_first_bit(&bitmap->chunksize,
-					sizeof(bitmap->chunksize));
+	bitmap->chunkshift = ffs(bitmap->chunksize) - 1;
 
 	/* now that chunksize and chunkshift are set, we can use these macros */
  	chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) /