On Tue, Jun 12, 2018 at 02:00:11PM +0200, Daniel Lezcano wrote:
> +static void __idle_injection_wakeup(struct idle_injection_device *ii_dev)
> +{
> +     struct idle_injection_thread *iit;
> +     struct cpumask tmp;
> +     unsigned int cpu;
> +
> +     cpumask_and(&tmp, ii_dev->cpumask, cpu_online_mask);

You should not be having a cpumask on the stack. Those things can be
ginormous.

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