const_folio_flags
{ return test_bit(PG_##name, const_folio_flags(folio, page)); }
test_bit(PG_swapcache, const_folio_flags(folio, 0));
bool ret = test_bit(PG_uptodate, const_folio_flags(folio, 0));
return test_bit(PG_head, const_folio_flags(folio, FOLIO_PF_ANY));