From cf5416ee2fc3270245104e643f486392b2b40f67 Mon Sep 17 00:00:00 2001
From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Date: Fri, 22 Feb 2013 16:35:54 -0800
Subject: [PATCH] --- yaml --- r: 356620 b: refs/heads/master c:
 e0fb58152955142f48ed31c8c0541b53e094da6b h: refs/heads/master v: v3

---
 [refs]                |  2 +-
 trunk/mm/page_alloc.c | 23 +++++++++++++++++++----
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/[refs] b/[refs]
index 2ff3f39b00e9..c80d2d69bf60 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 5f4b9fc5c1d3c8fc6037fa99d527ad3264dc0038
+refs/heads/master: e0fb58152955142f48ed31c8c0541b53e094da6b
diff --git a/trunk/mm/page_alloc.c b/trunk/mm/page_alloc.c
index 276140654305..e9075fdef695 100644
--- a/trunk/mm/page_alloc.c
+++ b/trunk/mm/page_alloc.c
@@ -2813,6 +2813,15 @@ void free_pages_exact(void *virt, size_t size)
 }
 EXPORT_SYMBOL(free_pages_exact);
 
+/**
+ * nr_free_zone_pages - count number of pages beyond high watermark
+ * @offset: The zone index of the highest zone
+ *
+ * nr_free_zone_pages() counts the number of counts pages which are beyond the
+ * high watermark within all zones at or below a given zone index.  For each
+ * zone, the number of pages is calculated as:
+ *     present_pages - high_pages
+ */
 static unsigned long nr_free_zone_pages(int offset)
 {
 	struct zoneref *z;
@@ -2833,8 +2842,11 @@ static unsigned long nr_free_zone_pages(int offset)
 	return sum;
 }
 
-/*
- * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL
+/**
+ * nr_free_buffer_pages - count number of pages beyond high watermark
+ *
+ * nr_free_buffer_pages() counts the number of pages which are beyond the high
+ * watermark within ZONE_DMA and ZONE_NORMAL.
  */
 unsigned long nr_free_buffer_pages(void)
 {
@@ -2842,8 +2854,11 @@ unsigned long nr_free_buffer_pages(void)
 }
 EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
 
-/*
- * Amount of free RAM allocatable within all zones
+/**
+ * nr_free_pagecache_pages - count number of pages beyond high watermark
+ *
+ * nr_free_pagecache_pages() counts the number of pages which are beyond the
+ * high watermark within all zones.
  */
 unsigned long nr_free_pagecache_pages(void)
 {