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