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mm: return boolean from page_has_private()

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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>
This commit is contained in:
Johannes Weiner
2009-09-21 17:02:59 -07:00
committed by Linus Torvalds
parent 6c0b13519d
commit edcf4748cd
3 changed files with 10 additions and 7 deletions
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13
include/linux/page-flags.h
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@@ -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 */