mm/swap: fix for "mm: workingset: age nonresident information alongside anonymous pages"

Non-file-lru page could also be activated in mark_page_accessed() and we
need to count this activation for nonresident_age.

Note that it's better for this patch to be squashed into the patch "mm:
workingset: age nonresident information alongside anonymous pages".

Link: http://lkml.kernel.org/r/1592288204-27734-3-git-send-email-iamjoonsoo.kim@lge.comSigned-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/swap.c

@@ -443,8 +443,7 @@ void mark_page_accessed(struct page *page)
 		else
 			__lru_cache_activate_page(page);
 		ClearPageReferenced(page);
-		if (page_is_file_lru(page))
-			workingset_activation(page);
+		workingset_activation(page);
 	}
 	if (page_is_idle(page))
 		clear_page_idle(page);