linux-kernel - Re: [PATCH] tick-sched: replace tick_nohz_active with tick_nohz_enabled in tick_nohz_switch_to

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Message-ID: <CAKohponUhM4kWPLRxSCoLt7pEWT8sjrMSiMU7TNiMFcQxjOSLg@mail.gmail.com>
Date:	Wed, 9 Apr 2014 21:28:31 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Matthew Whitehead <tedheadster@...il.com>,
	John Stultz <john.stultz@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mwhitehe@...hat.com,
	Frédéric Weisbecker <fweisbec@...il.com>,
	"# 3.13.x" <stable@...r.kernel.org>
Subject: Re: [PATCH] tick-sched: replace tick_nohz_active with
 tick_nohz_enabled in tick_nohz_switch_to_nohz()

On 9 April 2014 21:11, Steven Rostedt <rostedt@...dmis.org> wrote:
> But tick_nohz_active also gets set by tick_setup_sched_timer() which
> looks to be where it should get set. What is the case that this would
> set that variable and tick_setup_sched_timer() would not?

These two are in parallel and only one of these will ever succeed. So,
either tick_setup_sched_timer() or tick_nohz_switch_to_nohz() will
set it.
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