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Date: Mon, 20 May 2013 15:10:42 +0530
Message-ID: <CAKohpomjuv6G6Qj2YLv=j=pjASx=6vAaUOzd6gJ-NA2PBhOZAg@mail.gmail.com>
Subject: Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule,
 round 2
From: Viresh Kumar <viresh.kumar@linaro.org>
To: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>, Borislav Petkov <bp@alien8.de>,
        Michael Wang <wangyun@linux.vnet.ibm.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Jiri Kosina <jkosina@suse.cz>, Tony Luck <tony.luck@intel.com>,
        linux-kernel@vger.kernel.org, x86@kernel.org,
        Thomas Gleixner <tglx@linutronix.de>,
        "Rafael J. Wysocki" <rjw@sisk.pl>,
        Linux PM mailing list <linux-pm@vger.kernel.org>,
        Tejun Heo <tj@kernel.org>
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On 20 May 2013 15:01, Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> wrote:
> And Viresh, in the regular hotplug paths, the call to gov_cancel_work() is
> supposed to kill any pending workqueue functions pertaining to offline CPUs
> right?

Yes.. It will cancel work for all cpus first and will start again for
online cpus again.

> Could there be a synchronization bug somewhere due to which this
> might not be happening properly?

Not sure.. I have seen mutex's are used well in cpufreq_governor.. don't know
if I missed something.
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