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

Commit Message

Matthew Wilcox July 15, 2021, 3:35 a.m. UTC

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) <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Acked-by: Jeff Layton <[e-mail]>
Acked-by: Kirill A. Shutemov <[e-mail]>
Acked-by: Vlastimil Babka <[e-mail]>
Reviewed-by: William Kucharski <[e-mail]>
Reviewed-by: David Howells <[e-mail]>
---
 mm/filemap.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

Comments

Mike Rapoport July 20, 2021, 10:46 a.m. UTC | #1

On Thu, Jul 15, 2021 at 04:35:14AM +0100, Matthew Wilcox (Oracle) wrote:
> 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) <[e-mail]>
> Reviewed-by: Christoph Hellwig <[e-mail]>
> Acked-by: Jeff Layton <[e-mail]>
> Acked-by: Kirill A. Shutemov <[e-mail]>
> Acked-by: Vlastimil Babka <[e-mail]>
> Reviewed-by: William Kucharski <[e-mail]>
> Reviewed-by: David Howells <[e-mail]>
> ---
>  mm/filemap.c | 23 ++++++++++++-----------
>  1 file changed, 12 insertions(+), 11 deletions(-)

Acked-by: Mike Rapoport <[e-mail]>

Patch

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);