mm: introduce page_lru_base_type()

Instead of abusing page_is_file_cache() for LRU list index arithmetic, add
another helper with a more appropriate name and convert the non-boolean
users of page_is_file_cache() accordingly.

This new helper gives the LRU base type a page is supposed to live on,
inactive anon or inactive file.

[hugh.dickins@tiscali.co.uk: convert del_page_from_lru() also]
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 5 insertions, 5 deletions

diff --git a/mm/swap.c b/mm/swap.c
index cb29ae5..168d53e 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -118,7 +118,7 @@ static void pagevec_move_tail(struct pagevec *pvec)
 			spin_lock(&zone->lru_lock);
 		}
 		if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
-			int lru = page_is_file_cache(page);
+			int lru = page_lru_base_type(page);
 			list_move_tail(&page->lru, &zone->lru[lru].list);
 			pgmoved++;
 		}
@@ -181,7 +181,7 @@ void activate_page(struct page *page)
 	spin_lock_irq(&zone->lru_lock);
 	if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
 		int file = page_is_file_cache(page);
-		int lru = LRU_BASE + file;
+		int lru = page_lru_base_type(page);
 		del_page_from_lru_list(zone, page, lru);
 
 		SetPageActive(page);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index cad5d52..30e56ee 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -531,7 +531,7 @@ redo:
 		 * unevictable page on [in]active list.
 		 * We know how to handle that.
 		 */
-		lru = active + page_is_file_cache(page);
+		lru = active + page_lru_base_type(page);
 		lru_cache_add_lru(page, lru);
 	} else {
 		/*
@@ -986,7 +986,7 @@ static unsigned long clear_active_flags(struct list_head *page_list,
 	struct page *page;
 
 	list_for_each_entry(page, page_list, lru) {
-		lru = page_is_file_cache(page);
+		lru = page_lru_base_type(page);
 		if (PageActive(page)) {
 			lru += LRU_ACTIVE;
 			ClearPageActive(page);
@@ -2652,7 +2652,7 @@ static void check_move_unevictable_page(struct page *page, struct zone *zone)
 retry:
 	ClearPageUnevictable(page);
 	if (page_evictable(page, NULL)) {
-		enum lru_list l = LRU_INACTIVE_ANON + page_is_file_cache(page);
+		enum lru_list l = page_lru_base_type(page);
 
 		__dec_zone_state(zone, NR_UNEVICTABLE);
 		list_move(&page->lru, &zone->lru[l].list);