KN_ACTIVE
kn->kn_status &= ~KN_ACTIVE;
kn->kn_status |= KN_ACTIVE;
if ((kn->kn_status & (KN_ACTIVE | KN_DISABLED | KN_QUEUED)) ==
KN_ACTIVE)
kn->kn_status &= ~(KN_QUEUED | KN_ACTIVE |
kn->kn_status &= ~(KN_QUEUED | KN_ACTIVE);
(kn)->kn_status |= KN_ACTIVE; \