> +static void cpuset_seq_print_isolcpus(struct seq_file *sf, struct cpuset *cs)
> +{
> +     cpumask_var_t my_isolated_cpus;
> +
> +     if (!alloc_cpumask_var(&my_isolated_cpus, GFP_KERNEL))
> +             return;
> +

Make it return -ENOMEM ? Or make it a global variable and allocate memory for it
in cpuset_init().

> +     cpumask_and(my_isolated_cpus, cs->cpus_allowed, cpu_isolated_map);
> +
> +     seq_printf(sf, "%*pbl\n", nodemask_pr_args(my_isolated_cpus));
> +
> +     free_cpumask_var(my_isolated_cpus);
> +}
> +
>  /*
>   * These ascii lists should be read in a single call, by using a user
>   * buffer large enough to hold the entire map.  If read in smaller
> @@ -1733,6 +1748,9 @@ static int cpuset_common_seq_show(struct seq_file *sf, 
> void *v)
>       case FILE_EFFECTIVE_MEMLIST:
>               seq_printf(sf, "%*pbl\n", 
> nodemask_pr_args(&cs->effective_mems));
>               break;
> +     case FILE_ISOLCPUS:
> +             cpuset_seq_print_isolcpus(sf, cs);
> +             break;
>       default:
>               ret = -EINVAL;
>       }
> @@ -1893,6 +1911,12 @@ static struct cftype files[] = {
>               .private = FILE_MEMORY_PRESSURE_ENABLED,
>       },
>  
> +     {
> +             .name = "isolcpus",
> +             .seq_show = cpuset_common_seq_show,
> +             .private = FILE_ISOLCPUS,
> +     },
> +
>       { }     /* terminate */
>  };
>  
> 

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