swap_state: convert free_swap_cache() to use a folio

Saves several calls to compound_head().

Link: https://lkml.kernel.org/r/20220902194653.1739778-40-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/swap_state.c b/mm/swap_state.c
index 4af135a..438d067 100644 (file)
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -272,16 +272,19 @@ void clear_shadow_from_swap_cache(int type, unsigned long begin,
 /* 
  * If we are the only user, then try to free up the swap cache. 
  * 
- * Its ok to check for PageSwapCache without the page lock
+ * Its ok to check the swapcache flag without the folio lock
  * here because we are going to recheck again inside
- * try_to_free_swap() _with_ the lock.
+ * folio_free_swap() _with_ the lock.
  *                                     - Marcelo
  */
 void free_swap_cache(struct page *page)
 {
-       if (PageSwapCache(page) && !page_mapped(page) && trylock_page(page)) {
-               try_to_free_swap(page);
-               unlock_page(page);
+       struct folio *folio = page_folio(page);
+
+       if (folio_test_swapcache(folio) && !folio_mapped(folio) &&
+           folio_trylock(folio)) {
+               folio_free_swap(folio);
+               folio_unlock(folio);
        }
 }