PG_uptodate
u |= kpf_copy_bit(k, KPF_UPTODATE, PG_uptodate);
PG_movable_ops = PG_uptodate,
PG_reported = PG_uptodate,
bool ret = test_bit(PG_uptodate, const_folio_flags(folio, 0));
__set_bit(PG_uptodate, folio_flags(folio, 0));
set_bit(PG_uptodate, folio_flags(folio, 0));
flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
BUILD_BUG_ON(PG_uptodate > 7);
mask |= 1 << PG_uptodate;
(1L << PG_uptodate) |