On Mon, 24 Oct 2011, Yong Zhang wrote:

On Mon, Oct 24, 2011 at 11:24:51AM +0200, Thomas Gleixner wrote:

quoted

quoted

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?

Hmm, no. I obviously forgot that I moved it in RT :(

So yes, it should be safe. Though the question is why cpufreq does not
suffer from that that problem in mainline. I'll stare at that code
some more.

Thanks,

	tglx