linux-kernel - Re: [PATCH 03/14] sched: SCHED_DEADLINE structures & implementation.

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Date:	Mon, 14 Oct 2013 13:18:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Juri Lelli <juri.lelli@...il.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, rostedt@...dmis.org,
	oleg@...hat.com, fweisbec@...il.com, darren@...art.com,
	johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	tommaso.cucinotta@...up.it, nicola.manica@...i.unitn.it,
	luca.abeni@...tn.it, dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...il.com, liming.wang@...driver.com, jkacur@...hat.com,
	harald.gustafsson@...csson.com, vincent.guittot@...aro.org,
	bruce.ashfield@...driver.com--no-chain-reply-to
Subject: Re: [PATCH 03/14] sched: SCHED_DEADLINE structures & implementation.

On Mon, Oct 14, 2013 at 12:43:35PM +0200, Juri Lelli wrote:
> @@ -1693,8 +1701,14 @@ void sched_fork(struct task_struct *p)
>  		p->sched_reset_on_fork = 0;
>  	}
>  
> -	if (!rt_prio(p->prio))
> +	if (dl_prio(p->prio)) {
> +		put_cpu();
> +		return -EAGAIN;

Is this really the error we want to return on fork()?

EAGAIN to me indicates a spurious error and we should try again later;
however as it obvious from the code above; we'll always fail, there's no
point in trying again later.

I would think something like EINVAL; even though there are no arguments
to fork(); would me a better option.

Then again; I really don't care too much; anybody any preferences?
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