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>
mariux64 · Apr 29, 2013 · 40f4b1e · 40f4b1e
1 parent 5bc7b8a
commit 40f4b1e
Showing 1 changed file with 4 additions and 0 deletions.
diff --git 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;