linux-kernel - Re: [PATCH 0/3] hrtimer: HRTIMER_STATE

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Message-ID: <1433790523.1495.48.camel@twins>
Date:	Mon, 08 Jun 2015 21:08:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Oleg Nesterov <oleg@...hat.com>, umgwanakikbuti@...il.com,
	mingo@...e.hu, ktkhai@...allels.com, rostedt@...dmis.org,
	juri.lelli@...il.com, pang.xunlei@...aro.org,
	wanpeng.li@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] hrtimer: HRTIMER_STATE_ fixes

On Mon, 2015-06-08 at 19:11 +0200, Thomas Gleixner wrote:

> > Ah, yes, we could introduce timerqueue_is_queued() which uses
> > RB_EMPTY_NODE(). Obviating the need for hrtimer::state entirely.
> 
> Which won't work for the migration case unless we have some trickery
> like we do with double linked lists (not setting the prev member to
> NULL on dequeue).

Yeah, that dawned on me while away from the computer.

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