The page->mem_cgroup member is replaced by memcg_data, and add a helper
page_memcg() for it. Need to update comments to avoid confusing.

Signed-off-by: Alex Shi <[email protected]>
Cc: Johannes Weiner <[email protected]> 
Cc: Michal Hocko <[email protected]> 
Cc: Vladimir Davydov <[email protected]> 
Cc: Andrew Morton <[email protected]> 
Cc: [email protected] 
Cc: [email protected] 
Cc: [email protected] 
---
 mm/memcontrol.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b2aa3b73ab82..8a8debea34fc 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1310,7 +1310,7 @@ int mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
  * @page: the page
  * @pgdat: pgdat of the page
  *
- * This function relies on page->mem_cgroup being stable - see the
+ * This function relies on page_memcg(page) being stable - see the
  * access rules in commit_charge().
  */
 struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct pglist_data 
*pgdat)
@@ -2862,7 +2862,7 @@ static void commit_charge(struct page *page, struct 
mem_cgroup *memcg)
 {
        VM_BUG_ON_PAGE(page_memcg(page), page);
        /*
-        * Any of the following ensures page->mem_cgroup stability:
+        * Any of the following ensures page_memcg(page) stability:
         *
         * - the page lock
         * - LRU isolation
-- 
1.8.3.1

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