[PATCH 20/47] writeback: use do_div in bw calculation

[Wu Fengguang]

cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
 mm/page-writeback.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- linux-next.orig/mm/page-writeback.c	2010-12-08 22:44:28.000000000 +0800
+++ linux-next/mm/page-writeback.c	2010-12-08 22:44:28.000000000 +0800
@@ -658,10 +658,10 @@ static void balance_dirty_pages(struct a
 		 */
 		bw = bdi->write_bandwidth;
 		bw = bw * (bdi_thresh - bdi_dirty);
-		bw = bw / (bdi_thresh / BDI_SOFT_DIRTY_LIMIT + 1);
+		do_div(bw, bdi_thresh / BDI_SOFT_DIRTY_LIMIT + 1);
 
 		bw = bw * (task_thresh - bdi_dirty);
-		bw = bw / (bdi_thresh / TASK_SOFT_DIRTY_LIMIT + 1);
+		do_div(bw, bdi_thresh / TASK_SOFT_DIRTY_LIMIT + 1);
 
 		pause = HZ * (pages_dirtied << PAGE_CACHE_SHIFT) / (bw + 1);
 		pause = clamp_val(pause, 1, HZ/10);


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