linux-kernel - Re: [PATCH v2 2/3] Mutually exclude cpu online and suspend/hibernate

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Date:	Mon, 10 Oct 2011 11:25:28 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	<rjw@...k.pl>, <bp@...64.org>, <pavel@....cz>,
	<len.brown@...el.com>, <tj@...nel.org>, <mingo@...e.hu>,
	<akpm@...ux-foundation.org>, <suresh.b.siddha@...el.com>,
	<lucas.demarchi@...fusion.mobi>, <rusty@...tcorp.com.au>,
	<rdunlap@...otime.net>, <vatsa@...ux.vnet.ibm.com>,
	<ashok.raj@...el.com>, <tigran@...azian.fsnet.co.uk>,
	<tglx@...utronix.de>, <hpa@...or.com>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] Mutually exclude cpu online and suspend/hibernate

On Mon, 10 Oct 2011, Peter Zijlstra wrote:

> I just remember being very surprised about finding out the hotplug usage
> of suspend/hibernate wasn't at all serialized against the regular
> hotplug thingies.. (see 144060fee07e9c22e179d00819c83c86fbcbf82c).

It _is_ serialized against some of them... maybe not all, though.  
That's one of the purposes of the "prepare" and "complete" callback
methods in dev_pm_ops.

Alan Stern

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