[PATCH] vmpressure: fix divide-by-0 in vmpressure_work_fn

[Hugh Dickins]

Hit divide-by-0 in vmpressure_work_fn(): checking vmpr->scanned before
taking the lock is not enough, we must check scanned afterwards too.

Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---

 mm/vmpressure.c |    3 +++
 1 file changed, 3 insertions(+)

--- 3.11/mm/vmpressure.c	2013-09-02 13:46:10.000000000 -0700
+++ linux/mm/vmpressure.c	2013-09-06 22:43:03.596003080 -0700
@@ -187,6 +187,9 @@ static void vmpressure_work_fn(struct wo
 	vmpr->reclaimed = 0;
 	spin_unlock(&vmpr->sr_lock);
 
+	if (!scanned)
+		return;
+
 	do {
 		if (vmpressure_event(vmpr, scanned, reclaimed))
 			break;
--
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