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MM: export page_wakeup functions

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This will allow NFS to wait for PG_private to be cleared and,
particularly, to send a wake-up when it is.

Signed-off-by: NeilBrown <[email protected]>
Acked-by: Andrew Morton <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
This commit is contained in:
NeilBrown 2014-09-24 11:28:32 +10:00 • committed by Trond Myklebust
commit a4796e37c1
2 changed files with 10 additions and 8 deletions
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8
mm/filemap.c
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@ -670,17 +670,13 @@ EXPORT_SYMBOL(__page_cache_alloc);
* at a cost of "thundering herd" phenomena during rare hash
* collisions.
*/
static wait_queue_head_t *page_waitqueue(struct page *page)
wait_queue_head_t *page_waitqueue(struct page *page)
{
const struct zone *zone = page_zone(page);
return &zone->wait_table[hash_ptr(page, zone->wait_table_bits)];
}
static inline void wake_up_page(struct page *page, int bit)
{
__wake_up_bit(page_waitqueue(page), &page->flags, bit);
}
EXPORT_SYMBOL(page_waitqueue);
void wait_on_page_bit(struct page *page, int bit_nr)
{