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

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Date:	Mon, 10 Oct 2011 10:00:27 -0700
From:	Tejun Heo <tj@...nel.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	rjw@...k.pl, bp@...64.org, pavel@....cz, len.brown@...el.com,
	mingo@...e.hu, a.p.zijlstra@...llo.nl, 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

Hello,

On Mon, Oct 10, 2011 at 06:15:20PM +0530, Srivatsa S. Bhat wrote:
> Would it be better to hook into the suspend/hibernate notifiers and
> use them to exclude cpu hotplug from suspend/hibernate, instead of
> trying to take pm_mutex lock like this?

If this change is determined to be necessary, I think it would be
better to make it explicit.  Exclusion through callbacks often makes
the locking just more obscure.

Thanks.

-- 
tejun
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