alloc_sched_domains
cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
doms = alloc_sched_domains(ndoms);
doms = alloc_sched_domains(ndoms);
doms = alloc_sched_domains(ndoms);
doms_cur = alloc_sched_domains(ndoms_cur);
doms_new = alloc_sched_domains(1);