memory-failure: remove calls to page_mapping()

This is mostly just inlining page_mapping() into the two callers.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Reviewed-by: Sidhartha Kumar <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Acked-by: Miaohe Lin <[email protected]>
Cc: Eric Biggers <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
(cherry picked from commit 89f5c54)
Signed-off-by: Matthew R. Ochs <[email protected]>
Acked-by: Kai-Heng Feng <[email protected]>
Acked-by: Koba Ko <[email protected]>
Signed-off-by: Matthew R. Ochs <[email protected]>

mm/memory-failure.c

@@ -217,14 +217,15 @@ EXPORT_SYMBOL_GPL(hwpoison_filter_flags_value);
 
 static int hwpoison_filter_dev(struct page *p)
 {
+	struct folio *folio = page_folio(p);
 	struct address_space *mapping;
 	dev_t dev;
 
 	if (hwpoison_filter_dev_major == ~0U &&
 	    hwpoison_filter_dev_minor == ~0U)
 		return 0;
 
-	mapping = page_mapping(p);
+	mapping = folio_mapping(folio);
 	if (mapping == NULL || mapping->host == NULL)
 		return -EINVAL;
 
@@ -1094,7 +1095,8 @@ static int me_pagecache_clean(struct page_state *ps, struct page *p)
  */
 static int me_pagecache_dirty(struct page_state *ps, struct page *p)
 {
-	struct address_space *mapping = page_mapping(p);
+	struct folio *folio = page_folio(p);
+	struct address_space *mapping = folio_mapping(folio);
 
 	SetPageError(p);
 	/* TBD: print more information about the file. */