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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
View File

@ -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 */

2
mm/migrate.c
View File

@ -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);

2
mm/vmscan.c
View File

@ -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)