linux-kernel - RE: [PATCH 6/8] x86, topology.c: Enable CPU0 online/offline

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Message-ID: <493994B35A117E4F832F97C4719C4C04013E1A6784@orsmsx505.amr.corp.intel.com>
Date:	Thu, 3 Nov 2011 15:47:10 -0700
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Ingo Molnar <mingo@...e.hu>, H Peter Anvin <hpa@...or.com>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	"Luck, Tony" <tony.luck@...el.com>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Len Brown <lenb@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 6/8] x86, topology.c: Enable CPU0 online/offline

> > +	bsp_hotplug	[X86] BSP (aka CPU0) is hotpluggable.
> > +			Suspend/resume depends on BSP. It's said some PCI
> > +			quirks depend on BSP too. But not sure which quirks.
> 
> Right, not sure what breaks. Go ahead and watch your machine explode.
> 
> > +			If don't care the dependencies, you can turn on
> > +			bsp_ hotplug. Suspend will fail if BSP is offlined
> and
> > +			you need to online BSP before suspend/resume.
> 
> And you forgot poweroff and reboot, which have similar dependencies on
> some machines. That whole low level ACPI stuff is sensitive.

I tested poweroff, shutdown, and reboot with various reboot_type on a few different platforms. I haven't seen poweroff and reboot issues after CPU0 is offline.

Do you have specific platforms that I can test poweroff and reboot dependency on CPU0? Or we just assume there are some platforms out there that depend on CPU0 for poweroff/reboot?

Thanks.

-Fenghua 
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