[PATCH] page-writeback.c: fix update bandwidth time judgment error

From: Wanpneg Li <liwp <at> linux.vnet.ibm.com>

Since bdi_update_bandwidth function  should estimate write bandwidth at 200ms intervals,
so the time is bdi->bw_time_stamp + BANDWIDTH_INTERVAL == jiffies, but
if use time_is_after_eq_jiffies intervals will be bdi->bw_time_stamp +
BANDWIDTH_INTERVAL + 1.

Signed-off-by: Wanpeng Li <liwp <at> linux.vnet.ibm.com>
---
 mm/page-writeback.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index c833bf0..099e225 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
 <at>  <at>  -1032,7 +1032,7  <at>  <at>  static void bdi_update_bandwidth(struct backing_dev_info *bdi,
 				 unsigned long bdi_dirty,
 				 unsigned long start_time)
 {
-	if (time_is_after_eq_jiffies(bdi->bw_time_stamp + BANDWIDTH_INTERVAL))
+	if (time_is_after_jiffies(bdi->bw_time_stamp + BANDWIDTH_INTERVAL))
 		return;
 	spin_lock(&bdi->wb.list_lock);
 	__bdi_update_bandwidth(bdi, thresh, bg_thresh, dirty,
--

-- 
1.7.9.5

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