mm/page_alloc.c: use list_move() instead of list_del()/list_add() combination

Signed-off-by: NKirill A. Shutemov <kirill@shutemov.name>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Rik van Riel <riel@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/page_alloc.c

@@ -867,8 +867,7 @@ static int move_freepages(struct zone *zone,
 		}
 
 		order = page_order(page);
-		list_del(&page->lru);
-		list_add(&page->lru,
+		list_move(&page->lru,
 			  &zone->free_area[order].free_list[migratetype]);
 		page += 1 << order;
 		pages_moved += 1 << order;