mm: document deactivate_page

This patch adds function description for deactivate_page.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Shaohua Li <shli@kernel.org>
Cc: Wang, Yalin <Yalin.Wang@sonymobile.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/swap.c b/mm/swap.c
index 0da29bb84cf0a1ac71554f84dfe609fcc6bf93c3..0e306136f4a30bb5708e342710d56c325ea3184b 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -631,6 +631,13 @@ void deactivate_file_page(struct page *page)
        }
 }
 
+/**
+ * deactivate_page - deactivate a page
+ * @page: page to deactivate
+ *
+ * This function moves @page to inactive list if @page was on active list and
+ * was not unevictable page to accelerate to reclaim @page.
+ */
 void deactivate_page(struct page *page)
 {
        if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) {