mm: introduce PAGEFLAGS_MASK to replace ((1UL << NR_PAGEFLAGS) - 1)

[linux-2.6-microblaze.git] / include / linux / page-flags.h

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 5922031..6b8d669 100644 (file)
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -178,6 +178,8 @@ enum pageflags {
        PG_reported = PG_uptodate,
 };
 
+#define PAGEFLAGS_MASK         ((1UL << NR_PAGEFLAGS) - 1)
+
 #ifndef __GENERATING_BOUNDS_H
 
 static inline unsigned long _compound_head(const struct page *page)
@@ -859,7 +861,7 @@ static inline void ClearPageSlabPfmemalloc(struct page *page)
  * alloc-free cycle to prevent from reusing the page.
  */
 #define PAGE_FLAGS_CHECK_AT_PREP       \
-       (((1UL << NR_PAGEFLAGS) - 1) & ~__PG_HWPOISON)
+       (PAGEFLAGS_MASK & ~__PG_HWPOISON)
 
 #define PAGE_FLAGS_PRIVATE                             \
        (1UL << PG_private | 1UL << PG_private_2)