mm: simplify arch_make_folio_accessible()

Patch series "mm: remove arch_make_page_accessible()".

Now that s390x implements arch_make_folio_accessible(), let's convert
remaining users to use arch_make_folio_accessible() instead so we can
remove arch_make_page_accessible().


This patch (of 3):

Now that s390x implements HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE, let's turn
generic arch_make_folio_accessible() into a NOP: there are no other
targets that implement HAVE_ARCH_MAKE_PAGE_ACCESSIBLE but not
HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE.

Link: https://lkml.kernel.org/r/20240729183844.388481-1-david@redhat.com
Link: https://lkml.kernel.org/r/20240729183844.388481-2-david@redhat.comSigned-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/mm.h

@@ -2215,16 +2215,7 @@ static inline int arch_make_page_accessible(struct page *page)
 #ifndef HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE
 static inline int arch_make_folio_accessible(struct folio *folio)
 {
-	int ret;
-	long i, nr = folio_nr_pages(folio);
-
-	for (i = 0; i < nr; i++) {
-		ret = arch_make_page_accessible(folio_page(folio, i));
-		if (ret)
-			break;
-	}
-
-	return ret;
+	return 0;
 }
 #endif