mm: return boolean from page_has_private()

Make page_has_private() return a true boolean value and remove the double
negations from the two callsites using it for arithmetic.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Lameter <cl@linux-foundation.org>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
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, 2 insertions, 2 deletions

diff --git a/mm/migrate.c b/mm/migrate.c
index e97e513fe898..16052e80aaac 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -272,7 +272,7 @@ static int migrate_page_move_mapping(struct address_space *mapping,
         pslot = radix_tree_lookup_slot(&mapping->page_tree,
                                         page_index(page));
 
-        expected_count = 2 + !!page_has_private(page);
+        expected_count = 2 + page_has_private(page);
         if (page_count(page) != expected_count ||
                         (struct page *)radix_tree_deref_slot(pslot) != page) {
                 spin_unlock_irq(&mapping->tree_lock);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 172119caebcc..f5b5f029288c 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -286,7 +286,7 @@ static inline int page_mapping_inuse(struct page *page)
 
 static inline int is_page_cache_freeable(struct page *page)
 {
-        return page_count(page) - !!page_has_private(page) == 2;
+        return page_count(page) - page_has_private(page) == 2;
 }
 
 static int may_write_to_queue(struct backing_dev_info *bdi)