From 37b13061d339afd66e84509f35904f49e4797acb Mon Sep 17 00:00:00 2001
From: Christoph Lameter <cl@linux.com>
Date: Wed, 11 Sep 2013 14:21:31 -0700
Subject: [PATCH] vmstat: create fold_diff

Both functions that update global counters use the same mechanism.

Create a function that contains the common code.

Signed-off-by: Christoph Lameter <cl@linux.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
CC: Tejun Heo <tj@kernel.org>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Git-commit: 4edb0748b23887140578d68f5f4e6e2de337a481
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
CRs-Fixed: 802343
Change-Id: I950dd72d854a8a078ea4e6d90422fa7b5e50b61c
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
---
 mm/vmstat.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 7e7faa7d0a46..776c29a8d5ee 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -417,6 +417,15 @@ void dec_zone_page_state(struct page *page, enum zone_stat_item item)
 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.
  *
@@ -486,10 +495,7 @@ static void refresh_cpu_vm_stats(int cpu)
 			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);
 }
 
 /*
@@ -519,9 +525,7 @@ void cpu_vm_stats_fold(int cpu)
 			}
 	}
 
-	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);
 }
 
 /*