[PATCH RESEND] mm: accurately document nr_free_*_pages functions with code comments

[Zhang Yanfei <zhangyanfei@cn.fujitsu.com>]

Functions nr_free_zone_pages, nr_free_buffer_pages and nr_free_pagecache_pages
are horribly badly named, so accurately document them with code comments
in case of the misuse of them.

Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
---
 mm/page_alloc.c |   23 +++++++++++++++++++----
 1 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index df2022f..0790716 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2785,6 +2785,15 @@ void free_pages_exact(void *virt, size_t size)
 }
 EXPORT_SYMBOL(free_pages_exact);
 
+/**
+ * nr_free_zone_pages - get pages that is beyond high watermark
+ * @offset: The zone index of the highest zone
+ *
+ * The function counts pages which are beyond high watermark within
+ * all zones at or below a given zone index. For each zone, the
+ * amount of pages is calculated as:
+ *     present_pages - high_pages
+ */
 static unsigned int nr_free_zone_pages(int offset)
 {
 	struct zoneref *z;
@@ -2805,8 +2814,11 @@ static unsigned int nr_free_zone_pages(int offset)
 	return sum;
 }
 
-/*
- * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL
+/**
+ * nr_free_buffer_pages - get pages that is beyond high watermark
+ *
+ * The function counts pages which are beyond high watermark within
+ * ZONE_DMA and ZONE_NORMAL.
  */
 unsigned int nr_free_buffer_pages(void)
 {
@@ -2814,8 +2826,11 @@ unsigned int nr_free_buffer_pages(void)
 }
 EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
 
-/*
- * Amount of free RAM allocatable within all zones
+/**
+ * nr_free_pagecache_pages - get pages that is beyond high watermark
+ *
+ * The function counts pages which are beyond high watermark within
+ * all zones.
  */
 unsigned int nr_free_pagecache_pages(void)
 {
-- 
1.7.1

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