spin_trylock
if (spin_trylock(&cons_spin) == 0) {
if (rdd->uschedcp && spin_trylock(&rdd->spin)) {
if (spin_trylock(&rdd->spin)) {
if (__predict_true(spin_trylock(&pcpu->umount_spin))) {
if (spin_trylock(&m->spin) == 0)
if (spin_trylock(&m->spin) == 0)
if (spin_trylock(&m->spin) == 0)
if (spin_trylock(&m->spin) == 0)
if (spin_trylock(&m->spin) == 0)
if (spin_trylock(&z->zspin) == 0)
if (spin_trylock(&z->zspin) == 0) {