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Message-ID: <20120126093936.GA13963@elte.hu>
Date:	Thu, 26 Jan 2012 10:39:36 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hiroyuki KAMEZAWA <kamezawa.hiroyu@...fujitsu.com>,
	Motohiro Kosaki <kosaki.motohiro@...fujitsu.com>,
	Linux Kernel ML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] TASK_DEAD task is able to be woken up in special condition


* Peter Zijlstra <peterz@...radead.org> wrote:

> > It can generate delays at the exact same place, and can 
> > generate much longer delays than an SMI, if a high-prio RT 
> > task comes along.
> 
> No it can't, since do_exit() plays silly games with 
> preempt_disable().

ok, it being a critical section on both -rt and vanilla upstream 
explains it.

Thanks,

	Ingo
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