cpu_enabled_mask
return sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(cpu_enabled_mask));
#define for_each_enabled_cpu(cpu) for_each_cpu((cpu), cpu_enabled_mask)
#define num_enabled_cpus() cpumask_weight(cpu_enabled_mask)
return cpumask_test_cpu(cpu, cpu_enabled_mask);