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address_space *mapping, > - struct folio *newfolio, struct folio *folio, int extra_count) > +static void __folio_migrate_mapping(struct address_space *mapping, > + struct folio *newfolio, struct folio *folio, int expected_cnt) > { > XA_STATE(xas, &mapping->i_pages, folio_index(folio)); > struct zone *oldzone, *newzone; > - int dirty; > - int expected_count = folio_expected_refs(mapping, folio) + extra_count; > long nr = folio_nr_pages(folio); > long entries, i; > + int dirty; > > if (!mapping) { > - /* Anonymous page without mapping */ If 'mapping' was NULL, the first line would blow up while dereferencing 'mapping->i_pages'. The ordering change was introduced by commit 89eb946a7432b "(mm: Convert page migration to XArray)" Matthew, please correct me if I'm missing something. thanks, -jane --------------tLhaqSaLFE8sR1oqkeXDaB9S Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit [..] 
-int folio_migrate_mapping(struct address_space *mapping,
-		struct folio *newfolio, struct folio *folio, int extra_count)
+static void __folio_migrate_mapping(struct address_space *mapping,
+		struct folio *newfolio, struct folio *folio, int expected_cnt)
 {
 	XA_STATE(xas, &mapping->i_pages, folio_index(folio));
 	struct zone *oldzone, *newzone;
-	int dirty;
-	int expected_count = folio_expected_refs(mapping, folio) + extra_count;
 	long nr = folio_nr_pages(folio);
 	long entries, i;
+	int dirty;
 
 	if (!mapping) {
-		/* Anonymous page without mapping */

If 'mapping' was NULL, the first line would blow up while dereferencing 'mapping->i_pages'.

The ordering change was introduced by commit

89eb946a7432b "(mm: Convert page migration to XArray)"

Matthew, please correct me if I'm missing something.

thanks,

-jane

--------------tLhaqSaLFE8sR1oqkeXDaB9S--