em_span_cpus
pd_mask = em_span_cpus(pd);
if (!cpumask_equal(policy->related_cpus, em_span_cpus(em))) {
cpumask_pr_args(em_span_cpus(em)),
cpumask_pr_args(em_span_cpus(em)),
cpu = cpumask_first(em_span_cpus(pd));
cpumask_copy(em_span_cpus(pd), cpus);
cpu = cpumask_first_and(em_span_cpus(pd), cpu_active_mask);
em_span_cpus(pd));