cyclic_add_here
idp->cyi_ndx = cyclic_add_here(dest, &hdlr, &when, flags);
ocpu->cyo_ndx = cyclic_add_here(cpu, &hdlr, &when, 0);
idp->cyi_ndx = cyclic_add_here(idp->cyi_cpu, hdlr, when, 0);