mm: add is_huge_zero_folio()

This is the folio equivalent of is_huge_zero_page().  It doesn't add any
efficiency, but it does prevent the caller from passing a tail page and
getting confused when the predicate returns false.

Link: https://lkml.kernel.org/r/20240326202833.523759-3-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/swap_state.c b/mm/swap_state.c
index bfc7e8c58a6d..2deac23633cd 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -301,7 +301,7 @@ void free_page_and_swap_cache(struct page *page)
 	struct folio *folio = page_folio(page);
 
 	free_swap_cache(folio);
-	if (!is_huge_zero_page(page))
+	if (!is_huge_zero_folio(folio))
 		folio_put(folio);
 }