KN_HASH
struct klist *list = &fdp->fd_knhash[KN_HASH(kntrack->kn_id,
KN_HASH((u_long)kev->ident, fdp->fd_knhashmask)];
list = &fdp->fd_knhash[KN_HASH(kn->kn_id,
list = &fdp->fd_knhash[KN_HASH(kn->kn_id, fdp->fd_knhashmask)];