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

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Message-ID: <20180612125930.GP12217@hirez.programming.kicks-ass.net>
Date:   Tue, 12 Jun 2018 14:59:31 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     viresh.kumar@...aro.org, rjw@...ysocki.net,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Eduardo Valentin <edubezval@...il.com>,
        Javi Merino <javi.merino@...nel.org>,
        Leo Yan <leo.yan@...aro.org>,
        Kevin Wangtao <kevin.wangtao@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rui Zhang <rui.zhang@...el.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Andrea Parri <andrea.parri@...rulasolutions.com>
Subject: Re: [PATCH V6] powercap/drivers/idle_injection: Add an idle
 injection framework

On Tue, Jun 12, 2018 at 02:00:11PM +0200, Daniel Lezcano wrote:
> +struct idle_injection_device {

remove this:
> +	cpumask_var_t cpumask;

> +	struct hrtimer timer;
> +	struct completion stop_complete;
> +	unsigned int idle_duration_ms;
> +	unsigned int run_duration_ms;
> +	atomic_t count;

add:
	unsigned long cpumask[0];
> +};


> +static struct idle_injection_device *ii_dev_alloc(void)
> +{
> +	struct idle_injection_device *ii_dev;
> +
> +	ii_dev = kzalloc(sizeof(*ii_dev), GFP_KERNEL);

use:

	sizeof(*ii_dev) + cpumask_size()

> +	if (!ii_dev)
> +		return NULL;
> +

delete:

> +	if (!alloc_cpumask_var(&ii_dev->cpumask, GFP_KERNEL)) {
> +		kfree(ii_dev);
> +		return NULL;
> +	}
> +
> +	return ii_dev;
> +}

And use:

	to_cpumask(ii_dev->cpumask)