migrate_pages_batch
rc = migrate_pages_batch(from, get_new_folio, put_new_folio, private, MIGRATE_ASYNC,
rc = migrate_pages_batch(&folios, get_new_folio, put_new_folio,
rc = migrate_pages_batch(&folios, get_new_folio, put_new_folio,
migrate_pages_batch(&split_folios, get_new_folio,