Re: [PATCH V6] powercap/drivers/idle_injection: Add an idle injection framework

[Peter Zijlstra]

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.