From mboxrd@z Thu Jan  1 00:00:00 1970
From: Viresh Kumar <viresh.kumar@linaro.org>
Subject: Re: linux-next: Tree for Apr 9 [cpufreq: NULL pointer deref]
Date: Tue, 9 Apr 2013 20:26:42 +0530
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To: sedat.dilek@gmail.com
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, Stephen Rothwell <sfr@canb.auug.org.au>, linux-next@vger.kernel.org, linux-kernel@vger.kernel.org, cpufreq@vger.kernel.org, Linux PM list <linux-pm@vger.kernel.org>

On 9 April 2013 19:34, Sedat Dilek <sedat.dilek@gmail.com> wrote:
> I have seen it on reboots.
> How to online/offline from sysfs?

offline a cpu "x" with:

echo 0 > /sys/devices/system/cpu/cpux/online

and online with echo 1 > to same location.