__npf_atomic_cas_64
if (__npf_atomic_cas_64(&bm->bits0[i], bval, nval) != bval) {
if (__npf_atomic_cas_64(&bm->bits0[i], bval, bm1p) != bval) {
if (__npf_atomic_cas_64(&bm1->bits1[i], oval, nval) != oval) {
if (__npf_atomic_cas_64(&bm->bits0[i], bval, nval) != bval) {
if (__npf_atomic_cas_64(&bm1->bits1[i], oval, nval) != oval) {