Re: [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu.

[Ingo Molnar]

* Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx> wrote:

> On 04/19/2013 01:26 PM, Ingo Molnar wrote:
> > 
> > * Borislav Petkov <bp@xxxxxxxxx> wrote:
> > 
> >> On Wed, Apr 17, 2013 at 09:46:53AM +0200, Ingo Molnar wrote:
> >>
> >>> What you mention here should indeed already be handled by the architecture 
> >>> hotplug code (for example on x86 the boot CPU cannot be hot-removed).
> >>
> >> Supposedly, some new Intels (I think Ivybridge or so) can actually be 
> >> hot-removed.
> > 
> > There are WIP patches in existence that remove the limitations on the kernel side, 
> > but they are not upstream yet, so currently the constraint exists upstream.
> > 
> 
> I thought Fenghua Yu's upstream commits were supposed to handle that. Don't they?

Hm, I thought there were more patches needed to support actual hardware - the 
feature also has various limitations related suspend/resume. Are these 
CPU0-hotplug commits all that was needed to support the new hot-pluggable 
hardware?

In any case, you are right - it's indeed possible upstream as well.

Thanks,

	Ingo
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