BARRIER_BUCKETS_NR
for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++)
for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) {
conf->nr_pending = kzalloc_objs(atomic_t, BARRIER_BUCKETS_NR);
conf->nr_waiting = kzalloc_objs(atomic_t, BARRIER_BUCKETS_NR);
conf->nr_queued = kzalloc_objs(atomic_t, BARRIER_BUCKETS_NR);
conf->barrier = kzalloc_objs(atomic_t, BARRIER_BUCKETS_NR);