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    SubjectRe: [RFC] [PATCH -rt 5/5] cpufreq: get rid of get_online_cpus()/put_online_cpus()
    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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