From 27f9875b599c99074aeaf794f497a09e6a127709 Mon Sep 17 00:00:00 2001
From: Johannes Weiner <hannes@cmpxchg.org>
Date: Mon, 21 Sep 2009 17:03:00 -0700
Subject: [PATCH] --- yaml --- r: 164449 b: refs/heads/master c:
 ceddc3a52d783fabbf1ba623601419b9d6337194 h: refs/heads/master i:   164447:
 2f36e9abf4f1db576b90664e0cfca40d55752292 v: v3

---
 [refs]            | 2 +-
 trunk/mm/vmscan.c | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 0018f5ce5be3..1aa510c615b4 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: edcf4748cd56adcdf0856cc99ef108a4ea3ac7fe
+refs/heads/master: ceddc3a52d783fabbf1ba623601419b9d6337194
diff --git a/trunk/mm/vmscan.c b/trunk/mm/vmscan.c
index f5b5f029288c..5be8107e7758 100644
--- a/trunk/mm/vmscan.c
+++ b/trunk/mm/vmscan.c
@@ -286,6 +286,11 @@ static inline int page_mapping_inuse(struct page *page)
 
 static inline int is_page_cache_freeable(struct page *page)
 {
+	/*
+	 * A freeable page cache page is referenced only by the caller
+	 * that isolated the page, the page cache radix tree and
+	 * optional buffer heads at page->private.
+	 */
 	return page_count(page) - page_has_private(page) == 2;
 }