linux-kernel - Re: [RFC PATCH v1 3/8] sched/cpufreq_schedutil: make worker kthread be SCHED

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Message-ID: <20170711161816.pqlrkziya6gu5hms@hirez.programming.kicks-ass.net>
Date:   Tue, 11 Jul 2017 18:18:16 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juri Lelli <juri.lelli@....com>
Cc:     mingo@...hat.com, rjw@...ysocki.net, viresh.kumar@...aro.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        tglx@...utronix.de, vincent.guittot@...aro.org,
        rostedt@...dmis.org, luca.abeni@...tannapisa.it,
        claudio@...dence.eu.com, tommaso.cucinotta@...tannapisa.it,
        bristot@...hat.com, mathieu.poirier@...aro.org, tkjos@...roid.com,
        joelaf@...gle.com, andresoportus@...gle.com,
        morten.rasmussen@....com, dietmar.eggemann@....com,
        patrick.bellasi@....com, Ingo Molnar <mingo@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [RFC PATCH v1 3/8] sched/cpufreq_schedutil: make worker kthread
 be SCHED_DEADLINE

On Wed, Jul 05, 2017 at 09:59:00AM +0100, Juri Lelli wrote:
> @@ -4065,6 +4067,9 @@ static int __sched_setscheduler(struct task_struct *p,
>  	}
>  
>  	if (user) {
> +		if (attr->sched_flags & SCHED_FLAG_SPECIAL)
> +			return -EPERM;

Should be -EINVAL I think, as if the bit didn't exist at all (it
doesn't, from a userspace perspective).

> +
>  		retval = security_task_setscheduler(p);
>  		if (retval)
>  			return retval;