From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH V6] powercap/drivers/idle_injection: Add an idle
 injection framework
Date: Tue, 12 Jun 2018 14:30:36 +0200
Message-ID: <20180612123036.GJ12180@hirez.programming.kicks-ass.net>
References: <1528804816-32636-1-git-send-email-daniel.lezcano@linaro.org>
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To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: viresh.kumar@linaro.org, rjw@rjwysocki.net, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Eduardo Valentin <edubezval@gmail.com>, Javi Merino <javi.merino@kernel.org>, Leo Yan <leo.yan@linaro.org>, Kevin Wangtao <kevin.wangtao@linaro.org>, Vincent Guittot <vincent.guittot@linaro.org>, Rui Zhang <rui.zhang@intel.com>, Daniel Thompson <daniel.thompson@linaro.org>, Andrea Parri <andrea.parri@amarulasolutions.com>
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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.