mm/page_reporting.c: drop stale list head check in page_reporting_cycle

list_for_each_entry_safe() guarantees that we will never stumble over the
list head; "&page->lru != list" will always evaluate to true.  Let's
simplify.

[[email protected]: Changelog refinements]

Signed-off-by: Wei Yang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Reviewed-by: Alexander Duyck <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

mm/page_reporting.c

@@ -178,7 +178,7 @@ page_reporting_cycle(struct page_reporting_dev_info *prdev, struct zone *zone,
 		 * the new head of the free list before we release the
 		 * zone lock.
 		 */
-		if (&page->lru != list && !list_is_first(&page->lru, list))
+		if (!list_is_first(&page->lru, list))
 			list_rotate_to_front(&page->lru, list);
 
 		/* release lock before waiting on report processing */