mm: convert hugetlb_page_mapping_lock_write to folio

The page is only used to get the mapping, so the folio will do just as
well.  Both callers already have a folio available, so this saves a call
to compound_head().

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Reviewed-by: Jane Chu  <[email protected]>
Reviewed-by: Oscar Salvador <[email protected]>
Acked-by: Miaohe Lin <[email protected]>
Cc: Dan Williams <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

1 files changed, 3 insertions, 3 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 3b7d5ddc32ad..417fc5cdb6ee 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2155,13 +2155,13 @@ static bool prep_compound_gigantic_folio_for_demote(struct folio *folio,
 /*
  * Find and lock address space (mapping) in write mode.
  *
- * Upon entry, the page is locked which means that page_mapping() is
+ * Upon entry, the folio is locked which means that folio_mapping() is
  * stable.  Due to locking order, we can only trylock_write.  If we can
  * not get the lock, simply return NULL to caller.
  */
-struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage)
+struct address_space *hugetlb_folio_mapping_lock_write(struct folio *folio)
 {
-	struct address_space *mapping = page_mapping(hpage);
+	struct address_space *mapping = folio_mapping(folio);
 
 	if (!mapping)
 		return mapping;