EVFILT_MARKER
if (kn->kn_filter == EVFILT_MARKER) {
if (kn->kn_filter == EVFILT_MARKER) {
scan->kqs_start.kn_filter = EVFILT_MARKER;
scan->kqs_end.kn_filter = EVFILT_MARKER;
KASSERT(scan->kqs_start.kn_filter == EVFILT_MARKER);
KASSERT(scan->kqs_end.kn_filter == EVFILT_MARKER);
KASSERT(kn->kn_filter == EVFILT_MARKER);
KASSERT(kn->kn_filter != EVFILT_MARKER);
KASSERT(kn->kn_filter != EVFILT_MARKER);
KASSERT(kn->kn_filter != EVFILT_MARKER);
KASSERT(kn->kn_filter != EVFILT_MARKER);
KASSERT(kn->kn_filter != EVFILT_MARKER);