linux-kernel - Re: [PATCH Resend] Expose do_timer CPU via sysctl to userspace as R/W

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Date:	Wed, 19 Feb 2014 20:50:44 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Henrik Austad <henrik@...tad.us>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Henrik Austad <haustad@...co.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH Resend] Expose do_timer CPU via sysctl to userspace as R/W

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
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