From 40f4b1ead0e7a31bd1acf9b683f9ddcf52b0dfe4 Mon Sep 17 00:00:00 2001
From: Cody P Schafer <cody@linux.vnet.ibm.com>
Date: Mon, 29 Apr 2013 15:08:38 -0700
Subject: [PATCH] mm/vmstat: add note on safety of drain_zonestat

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/vmstat.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index c823776f7059..f42745e65780 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -493,6 +493,10 @@ void refresh_cpu_vm_stats(int cpu)
 			atomic_long_add(global_diff[i], &vm_stat[i]);
 }
 
+/*
+ * this is only called if !populated_zone(zone), which implies no other users of
+ * pset->vm_stat_diff[] exsist.
+ */
 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *pset)
 {
 	int i;
-- 
2.30.2