[PATCH v14 028/138] mm/filemap: Add folio_wake_bit()

Matthew Wilcox (Oracle)
2021-07-15T04:01:35Z

Convert wake_up_page_bit() to folio_wake_bit(). All callers have a folio,
so use it directly. Saves 66 bytes of text in end_page_private_2().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: David Howells <dhowells@redhat.com>
---
mm/filemap.c | 23 ++++++++++++-----------
1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index b55c89d7997f..a3ef9abcbcde 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1121,14 +1121,14 @@ static int wake_page_function(wait_queue_entry_t *wait, unsigned mode, int sync,
return (flags & WQ_FLAG_EXCLUSIVE) != 0;
}

-static void wake_up_page_bit(struct page *page, int bit_nr)
+static void folio_wake_bit(struct folio *folio, int bit_nr)
{
- wait_queue_head_t *q = page_waitqueue(page);
+ wait_queue_head_t *q = page_waitqueue(&folio->page);
struct wait_page_key key;
unsigned long flags;
wait_queue_entry_t bookmark;

- key.page = page;
+ key.page = &folio->page;
key.bit_nr = bit_nr;
key.page_match = 0;

@@ -1163,7 +1163,7 @@ static void wake_up_page_bit(struct page *page, int bit_nr)
* page waiters.
*/
if (!waitqueue_active(q) || !key.page_match) {
- ClearPageWaiters(page);
+ folio_clear_waiters(folio);
/*
* It's possible to miss clearing Waiters here, when we woke
* our page waiters, but the hashed waitqueue has waiters for
@@ -1179,7 +1179,7 @@ static void folio_wake(struct folio *folio, int bit)
{
if (!folio_test_waiters(folio))
return;
- wake_up_page_bit(&folio->page, bit);
+ folio_wake_bit(folio, bit);
}

/*
@@ -1446,7 +1446,7 @@ void folio_unlock(struct folio *folio)
BUILD_BUG_ON(PG_locked > 7);
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
if (clear_bit_unlock_is_negative_byte(PG_locked, folio_flags(folio, 0)))
- wake_up_page_bit(&folio->page, PG_locked);
+ folio_wake_bit(folio, PG_locked);
}
EXPORT_SYMBOL(folio_unlock);

@@ -1463,11 +1463,12 @@ EXPORT_SYMBOL(folio_unlock);
*/
void end_page_private_2(struct page *page)
{
- page = compound_head(page);
- VM_BUG_ON_PAGE(!PagePrivate2(page), page);
- clear_bit_unlock(PG_private_2, &page->flags);
- wake_up_page_bit(page, PG_private_2);
- put_page(page);
+ struct folio *folio = page_folio(page);
+
+ VM_BUG_ON_FOLIO(!folio_test_private_2(folio), folio);
+ clear_bit_unlock(PG_private_2, folio_flags(folio, 0));
+ folio_wake_bit(folio, PG_private_2);
+ folio_put(folio);
}
EXPORT_SYMBOL(end_page_private_2);

--
2.30.2