[PATCH v6 6/7] mm/memcg: kill mem_cgroup_lru_del()

[Konstantin Khlebnikov <khlebnikov@openvz.org>]

This patch kills mem_cgroup_lru_del(), we can use mem_cgroup_lru_del_list()
instead. On 0-order isolation we already have right lru list id.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
---
 include/linux/memcontrol.h |    5 -----
 mm/memcontrol.c            |    5 -----
 mm/vmscan.c                |    7 +++++--
 3 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 95dc32c..58d820c 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -66,7 +66,6 @@ struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
 struct lruvec *mem_cgroup_lru_add_list(struct zone *, struct page *,
 				       enum lru_list);
 void mem_cgroup_lru_del_list(struct page *, enum lru_list);
-void mem_cgroup_lru_del(struct page *);
 struct lruvec *mem_cgroup_lru_move_lists(struct zone *, struct page *,
 					 enum lru_list, enum lru_list);
 
@@ -260,10 +259,6 @@ static inline void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru)
 {
 }
 
-static inline void mem_cgroup_lru_del(struct page *page)
-{
-}
-
 static inline struct lruvec *mem_cgroup_lru_move_lists(struct zone *zone,
 						       struct page *page,
 						       enum lru_list from,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 59697fb..16db6c1 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1115,11 +1115,6 @@ void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru)
 	mz->lru_size[lru] -= 1 << compound_order(page);
 }
 
-void mem_cgroup_lru_del(struct page *page)
-{
-	mem_cgroup_lru_del_list(page, page_lru(page));
-}
-
 /**
  * mem_cgroup_lru_move_lists - account for moving a page between lrus
  * @zone: zone of the page
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5f6ed98..9de66be 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1147,7 +1147,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 
 		switch (__isolate_lru_page(page, mode)) {
 		case 0:
-			mem_cgroup_lru_del(page);
+			mem_cgroup_lru_del_list(page, lru);
 			list_move(&page->lru, dst);
 			nr_taken += hpage_nr_pages(page);
 			break;
@@ -1205,8 +1205,11 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 
 			if (__isolate_lru_page(cursor_page, mode) == 0) {
 				unsigned int isolated_pages;
+				enum lru_list cursor_lru;
 
-				mem_cgroup_lru_del(cursor_page);
+				cursor_lru = page_lru(cursor_page);
+				mem_cgroup_lru_del_list(cursor_page,
+							cursor_lru);
 				list_move(&cursor_page->lru, dst);
 				isolated_pages = hpage_nr_pages(cursor_page);
 				nr_taken += isolated_pages;