Hi!
> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> commit 4bb7f6c2781e46fc5bd00475a66df2ea30ef330d upstream.
>
> Commit 68b99e94a4a2 ("thermal: intel_powerclamp: Use get_cpu() instead
> of smp_processor_id() to avoid crash") fixed an issue related to using
> smp_processor_id() in preemptible context by replacing it with a pair
> of get_cpu()/put_cpu(), but what is needed there really is any online
> CPU and not necessarily the one currently running the code. Arguably,
> getting the one that's running the code in there is confusing.
>
> For this reason, simply give the control CPU role to the first online
> one which automatically will be CPU0 if it is online, so one check
> can be dropped from the code for an added benefit.
While this is nice cleanup (and I complained about original code being
interesting) original code still looks okay and we don't really need this in
stable.
Thanks and best regards,
Pavel
> +++ b/drivers/thermal/intel_powerclamp.c
> @@ -518,11 +518,7 @@ static int start_power_clamp(void)
> get_online_cpus();
>
> /* prefer BSP */
> - control_cpu = 0;
> - if (!cpu_online(control_cpu)) {
> - control_cpu = get_cpu();
> - put_cpu();
> - }
> + control_cpu = cpumask_first(cpu_online_mask);
>
> clamping = true;
> schedule_delayed_work(&poll_pkg_cstate_work, 0);
>
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