From 15702d7fb6e7a6baf5a04286a227b0ad2fe4a03f Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Tue, 22 May 2012 13:55:25 +1000
Subject: md/bitmap: use DIV_ROUND_UP instead of open-code

Also take the opportunity to simplify CHUNK_BLOCK_RATIO.

Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index c100a47..bc552bb 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1694,9 +1694,8 @@ int bitmap_create(struct mddev *mddev)
 	bitmap->counts.chunkshift = (ffz(~mddev->bitmap_info.chunksize)
 			      - BITMAP_BLOCK_SHIFT);
 
-	chunks = (blocks + (1 << bitmap->counts.chunkshift) - 1) >>
-			bitmap->counts.chunkshift;
-	pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO;
+	chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << bitmap->counts.chunkshift);
+	pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO);
 
 	BUG_ON(!pages);
 
-- 
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