linux-kernel - Re: [PATCH RESEND v10] sched/deadline: support dl task migration during cpu hotplug

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Message-ID: <20150323085523.GB23123@twins.programming.kicks-ass.net>
Date:	Mon, 23 Mar 2015 09:55:23 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Wanpeng Li <wanpeng.li@...ux.intel.com>,
	Juri Lelli <juri.lelli@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v10] sched/deadline: support dl task migration
 during cpu hotplug

On Mon, Mar 23, 2015 at 08:25:04AM +0100, Ingo Molnar wrote:
> > >> >> >> +			if (cpu >= nr_cpu_ids) {
> > >> >> >> +				if (dl_bandwidth_enabled()) {
> > >> >> >> +					/*
> > >> >> >> +					 * Fail to find any suitable cpu.
> > >> >> >> +					 * The task will never come back!
> > >> >> >> +					 */
> > >> >> >> +					WARN_ON(1);
> > >> >> >
> > >> >> > Can this condition happen to users with a non-buggy kernel?

> I still haven't seen a satisfactory answer to this question. Please 
> don't resend patches without clearing questions raised during review.

So I had a look on Friday, it _should_ not happen, but it does due to a
second bug Juri is currently chasing down.
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