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>

1 files changed, 8 insertions, 5 deletions

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index d07c0bb2203a..13de789f0a5c 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -402,8 +402,8 @@ static inline void __ClearPageTail(struct page *page)
  */
 #define PAGE_FLAGS_CHECK_AT_PREP        ((1 << NR_PAGEFLAGS) - 1)
 
-#endif /* !__GENERATING_BOUNDS_H */
-
+#define PAGE_FLAGS_PRIVATE                              \
+        (1 << PG_private | 1 << PG_private_2)
 /**
  * page_has_private - Determine if page has private stuff
  * @page: The page to be checked
@@ -411,8 +411,11 @@ static inline void __ClearPageTail(struct page *page)
  * Determine if a page has private stuff, indicating that release routines
  * should be invoked upon it.
  */
-#define page_has_private(page)                  \
-        ((page)->flags & ((1 << PG_private) |   \
-                          (1 << PG_private_2)))
+static inline int page_has_private(struct page *page)
+{
+        return !!(page->flags & PAGE_FLAGS_PRIVATE);
+}
+
+#endif /* !__GENERATING_BOUNDS_H */
 
 #endif  /* PAGE_FLAGS_H */