linux-kernel - Re: [RFC][PATCH 04/11] sched: Rework TASK

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Message-ID: <alpine.DEB.2.11.1509291513390.4500@nanos>
Date:	Tue, 29 Sep 2015 15:13:50 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, fweisbec@...il.com, oleg@...hat.com,
	umgwanakikbuti@...il.com, rostedt@...dmis.org
Subject: Re: [RFC][PATCH 04/11] sched: Rework TASK_DEAD preemption
 exception

On Tue, 29 Sep 2015, Peter Zijlstra wrote:

> TASK_DEAD is special in that the final schedule call from do_exit()
> must be done with preemption disabled.
> 
> This leads to a violation of our new scheduling invariant which states
> that the preempt count should be 2. Move the check for TASK_DEAD out
> of the debug check and use it to decrement the preempt count (from 2
> to 1).

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
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