linux-kernel - Re: [PATCH 03/13] rcu: Exclude all potential timekeepers from sysidle detection

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Message-ID: <20131218141549.GN19211@linux.vnet.ibm.com>
Date:	Wed, 18 Dec 2013 06:15:49 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	John Stultz <john.stultz@...aro.org>,
	Alex Shi <alex.shi@...aro.org>,
	Kevin Hilman <khilman@...aro.org>
Subject: Re: [PATCH 03/13] rcu: Exclude all potential timekeepers from
 sysidle detection

On Wed, Dec 18, 2013 at 12:43:18PM +0100, Peter Zijlstra wrote:
> On Wed, Dec 18, 2013 at 12:49:15AM +0100, Frederic Weisbecker wrote:
> > That's to start simple as CPU 0 can't be offlined.
> 
> Yes it can, see CONFIG_BOOTPARAM_HOTPLUG_CPU0

Ah, and cpu0_hotplug boot parameter even if CONFIG_BOOTPARAM_HOTPLUG_CPU0=n.

Good to know!

							Thanx, Paul

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