KN_SCAN
kn->kn_status |= KN_SCAN;
kn->kn_status &= ~KN_SCAN;
kn->kn_status |= KN_SCAN;
KN_SCAN);
kn->kn_status &= ~KN_SCAN;
if (kn_in_flux(kn) && (kn->kn_status & KN_SCAN) == 0) {
(kn_in_flux(kn) && (kn->kn_status & KN_SCAN) == 0)) {
if (kn_in_flux(kn) && (kn->kn_status & KN_SCAN) == 0) {