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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 <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin
2008-10-18 20:26:59 -07:00
committed by Linus Torvalds
parent a978d6f521
commit 8413ac9d8c
3 changed files with 7 additions and 10 deletions
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2
mm/swapfile.c
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@ -422,7 +422,7 @@ void free_swap_and_cache(swp_entry_t entry)
if (p) {
if (swap_entry_free(p, swp_offset(entry)) == 1) {
page = find_get_page(&swapper_space, entry.val);
if (page && unlikely(!trylock_page(page))) {
if (page && !trylock_page(page)) {
page_cache_release(page);
page = NULL;
}