Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123native_smp_send_reschedule, round 2

From: Borislav Petkov
Date: Mon May 20 2013 - 00:50:29 EST

On Mon, May 20, 2013 at 11:16:33AM +0800, Michael Wang wrote:
> I suppose the reason is that the cpu we passed to
> mod_delayed_work_on() has a chance to become offline before we
> disabled irq, what about check it before send resched ipi? like:

I think this is only addressing the symptoms - what we should be doing
instead is asking ourselves why are we even scheduling work on a cpu if
the machine goes offline?

I don't know though who should be responsible for killing all that
work - the workqueue itself or the guy who created it, i.e. cpufreq



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