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, 3 insertions, 3 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 75ad971ca45ea..5c043c7b50624 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -789,12 +789,12 @@ struct deferred_split *get_deferred_split_queue(struct folio *folio)
 }
 #endif
 
-static inline bool is_transparent_hugepage(struct folio *folio)
+static inline bool is_transparent_hugepage(const struct folio *folio)
 {
 	if (!folio_test_large(folio))
 		return false;
 
-	return is_huge_zero_page(&folio->page) ||
+	return is_huge_zero_folio(folio) ||
 		folio_test_large_rmappable(folio);
 }
 
@@ -3085,7 +3085,7 @@ int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
 	}
 
 
-	is_hzp = is_huge_zero_page(&folio->page);
+	is_hzp = is_huge_zero_folio(folio);
 	if (is_hzp) {
 		pr_warn_ratelimited("Called split_huge_page for huge zero page\n");
 		return -EBUSY;