diff --git a/mm/vmstat.c b/mm/vmstat.c
index aaee663..158ca64 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -414,6 +414,15 @@
 EXPORT_SYMBOL(dec_zone_page_state);
 #endif
 
+static inline void fold_diff(int *diff)
+{
+	int i;
+
+	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
+		if (diff[i])
+			atomic_long_add(diff[i], &vm_stat[i]);
+}
+
 /*
  * Update the zone counters for the current cpu.
  *
@@ -483,10 +492,7 @@
 			drain_zone_pages(zone, &p->pcp);
 #endif
 	}
-
-	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
-		if (global_diff[i])
-			atomic_long_add(global_diff[i], &vm_stat[i]);
+	fold_diff(global_diff);
 }
 
 /*
@@ -516,9 +522,7 @@
 			}
 	}
 
-	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
-		if (global_diff[i])
-			atomic_long_add(global_diff[i], &vm_stat[i]);
+	fold_diff(global_diff);
 }
 
 /*