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mm: page lock use lock bitops

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trylock_page, unlock_page open and close a critical section. Hence,
we can use the lock bitops to get the desired memory ordering.

Also, mark trylock as likely to succeed (and remove the annotation from
callers).

Signed-off-by: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nick Piggin 2008-10-18 20:26:59 -07:00 • committed by Linus Torvalds
commit 8413ac9d8c
3 changed files with 7 additions and 10 deletions
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2
include/linux/pagemap.h
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@ -311,7 +311,7 @@ static inline void __clear_page_locked(struct page *page)
static inline int trylock_page(struct page *page)
{
return !test_and_set_bit(PG_locked, &page->flags);
return (likely(!test_and_set_bit_lock(PG_locked, &page->flags)));
}
/*