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

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Date:	Fri, 19 Apr 2013 10:44:28 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Borislav Petkov <bp@...en8.de>, Robin Holt <holt@....com>,
	Ingo Molnar <mingo@...hat.com>, Russ Anderson <rja@....com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Joe Perches <joe@...ches.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michel Lespinasse <walken@...gle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	Tejun Heo <tj@...nel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu.


* Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com> wrote:

> On 04/19/2013 01:26 PM, Ingo Molnar wrote:
> > 
> > * Borislav Petkov <bp@...en8.de> 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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