mm: remove vma arg from page_evictable

page_evictable(page, vma) is an irritant: almost all its callers pass
NULL for vma.  Remove the vma arg and use mlocked_vma_newpage(vma, page)
explicitly in the couple of places it's needed.  But in those places we
don't even need page_evictable() itself!  They're dealing with a freshly
allocated anonymous page, which has no "mapping" and cannot be mlocked yet.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Rik van Riel <riel@redhat.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michel Lespinasse <walken@google.com>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 18 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index b010efc..8b62730 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -553,7 +553,7 @@ void putback_lru_page(struct page *page)
 redo:
 	ClearPageUnevictable(page);
 
-	if (page_evictable(page, NULL)) {
+	if (page_evictable(page)) {
 		/*
 		 * For evictable pages, we can use the cache.
 		 * In event of a race, worst case is we end up with an
@@ -587,7 +587,7 @@ redo:
 	 * page is on unevictable list, it never be freed. To avoid that,
 	 * check after we added it to the list, again.
 	 */
-	if (lru == LRU_UNEVICTABLE && page_evictable(page, NULL)) {
+	if (lru == LRU_UNEVICTABLE && page_evictable(page)) {
 		if (!isolate_lru_page(page)) {
 			put_page(page);
 			goto redo;
@@ -709,7 +709,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 
 		sc->nr_scanned++;
 
-		if (unlikely(!page_evictable(page, NULL)))
+		if (unlikely(!page_evictable(page)))
 			goto cull_mlocked;
 
 		if (!sc->may_unmap && page_mapped(page))
@@ -1217,7 +1217,7 @@ putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
 
 		VM_BUG_ON(PageLRU(page));
 		list_del(&page->lru);
-		if (unlikely(!page_evictable(page, NULL))) {
+		if (unlikely(!page_evictable(page))) {
 			spin_unlock_irq(&zone->lru_lock);
 			putback_lru_page(page);
 			spin_lock_irq(&zone->lru_lock);
@@ -1470,7 +1470,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
 		page = lru_to_page(&l_hold);
 		list_del(&page->lru);
 
-		if (unlikely(!page_evictable(page, NULL))) {
+		if (unlikely(!page_evictable(page))) {
 			putback_lru_page(page);
 			continue;
 		}
@@ -3414,27 +3414,18 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 /*
  * page_evictable - test whether a page is evictable
  * @page: the page to test
- * @vma: the VMA in which the page is or will be mapped, may be NULL
  *
  * Test whether page is evictable--i.e., should be placed on active/inactive
- * lists vs unevictable list.  The vma argument is !NULL when called from the
- * fault path to determine how to instantate a new page.
+ * lists vs unevictable list.
  *
  * Reasons page might not be evictable:
  * (1) page's mapping marked unevictable
  * (2) page is part of an mlocked VMA
  *
  */
-int page_evictable(struct page *page, struct vm_area_struct *vma)
+int page_evictable(struct page *page)
 {
-
-	if (mapping_unevictable(page_mapping(page)))
-		return 0;
-
-	if (PageMlocked(page) || (vma && mlocked_vma_newpage(vma, page)))
-		return 0;
-
-	return 1;
+	return !mapping_unevictable(page_mapping(page)) && !PageMlocked(page);
 }
 
 #ifdef CONFIG_SHMEM
@@ -3472,7 +3463,7 @@ void check_move_unevictable_pages(struct page **pages, int nr_pages)
 		if (!PageLRU(page) || !PageUnevictable(page))
 			continue;
 
-		if (page_evictable(page, NULL)) {
+		if (page_evictable(page)) {
 			enum lru_list lru = page_lru_base_type(page);
 
 			VM_BUG_ON(PageActive(page));