mm/filemap: Add folio_wake_bit()

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>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>

diff --git a/mm/filemap.c b/mm/filemap.c
index 13663f0..a896348 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1176,14 +1176,14 @@ 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;
 
@@ -1218,7 +1218,7 @@ 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
@@ -1234,7 +1234,7 @@ 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);
 }
 
 /*
@@ -1501,7 +1501,7 @@ 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);
 
@@ -1518,11 +1518,12 @@ 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);