_NPCPV
struct pv_entry pc_pventry[_NPCPV];
((1UL << (_NPCPV - sizeof(u_long) * 8 * (_NPCM - 1))) - 1)
PV_STAT(pv_entry_spare -= _NPCPV);
PV_STAT(pv_entry_spare -= _NPCPV);
PV_STAT(pv_entry_spare += _NPCPV - 1);