Re: [RFC] [PATCH -rt 5/5] cpufreq: get rid ofget_online_cpus()/put_online_cpus()

[Yong Zhang]

On Mon, Oct 24, 2011 at 11:24:51AM +0200, Thomas Gleixner wrote:
> 
> 
> On Mon, 24 Oct 2011, Yong Zhang wrote:
> 
> > On Wed, Oct 19, 2011 at 11:12:20AM +0200, Thomas Gleixner wrote:
> > > On Sun, 16 Oct 2011, Yong Zhang wrote:
> > > 
> > > > Fix below false positive (seems this is not a real deadlock scenario)
> > > > lockdep warning:
> > > 
> > > This looks like you caused it with patch 1.
> > 
> > Hmmm, yup.
> > CPU_DOWN_PREPARE will be under cpu_hotplug.lock.
> > 
> > > Both need a bit more
> > > thought, but thanks for catching that.
> > 
> > No sure whether it's big issue or not.
> > Mind showing more about your concern?
> 
> This is probably not the only place which will run into that issue and
> I have not much interest to patch all those sites.

If so, I think that kind of violation has been caught in mainline,
because mainline has had CPU_DOWN_PREPARE called under
cpu_hotplug.lock, right?

Or am I missing something?

Thanks,
Yong
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