linux-kernel - Re: [PATCH V2 1/2] Tick: Introduce tick_nohz

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Date:	Fri, 15 Nov 2013 12:06:24 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Lan Tianyu <tianyu.lan@...el.com>
cc:	dipankar@...ibm.com, paulmck@...ux.vnet.ibm.com,
	fweisbec@...il.com, rjw@...ysocki.net, viresh.kumar@...aro.org,
	rostedt@...dmis.org, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/2] Tick: Introduce tick_nohz_check() to check nohz
 enable status

On Fri, 15 Nov 2013, Lan Tianyu wrote:

> In some cases, nohz enable status needs to be checked. E.G, in RCU and cpufreq
> ondemand governor. So add tick_nohz_check() to return tick_nohz_enabled value
> And use tick_nohz_check() instead of referencing tick_nohz_enabled in the rcutree_plugin.h.

What's the point of this? 

Checking for tick_nohz_enabled is wrong to begin with.

See https://lkml.org/lkml/2013/11/13/424
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