PVF_REF
(pg->mdpage.pvh_attrs & PVF_REF)) {
nflags |= PVF_REF;
PVF_MOD | PVF_REF, nflags);
if (pg->mdpage.pvh_attrs & PVF_REF) {
pmap_clearbit(pg, PVF_REF);
pg->mdpage.pvh_attrs |= PVF_REF;
pv->pv_flags |= PVF_REF;
pg->mdpage.pvh_attrs |= flags & (PVF_REF | PVF_MOD);
if (clr_mask & (PVF_REF | PVF_MOD))
pg->mdpage.pvh_attrs |= set_mask & (PVF_REF | PVF_MOD);
pg->mdpage.pvh_attrs &= ~(maskbits & (PVF_MOD | PVF_REF));
if (maskbits & PVF_REF) {
(((pg)->mdpage.pvh_attrs & PVF_REF) != 0)