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Date: Wed, 19 Feb 2014 20:50:44 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Henrik Austad <henrik@austad.us>
Cc: Thomas Gleixner <tglx@linutronix.de>, LKML <linux-kernel@vger.kernel.org>,
        Henrik Austad <haustad@cisco.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        John Stultz <john.stultz@linaro.org>
Subject: Re: [PATCH Resend] Expose do_timer CPU via sysctl to userspace as R/W
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On Wed, Feb 19, 2014 at 08:43:55PM +0100, Henrik Austad wrote:
> The online-part should be taken care of by the cpu_present(), no?

No, cpu_present() only means there is a physical CPU present. It might
be offline.

See the comment in include/linux/cpumask.h