linux-kernel - Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send

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Message-ID: <CAKohpomjuv6G6Qj2YLv=j=pjASx=6vAaUOzd6gJ-NA2PBhOZAg@mail.gmail.com>
Date:	Mon, 20 May 2013 15:10:42 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Borislav Petkov <bp@...en8.de>,
	Michael Wang <wangyun@...ux.vnet.ibm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jiri Kosina <jkosina@...e.cz>, Tony Luck <tony.luck@...el.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule,
 round 2

On 20 May 2013 15:01, Srivatsa S. Bhat <srivatsa.bhat@...ux.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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