linux-kernel - Re: [PATCH v2] Add suspend/resume for HPET

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Message-Id: <1175358800.28263.36.camel@localhost.localdomain>
Date:	Sat, 31 Mar 2007 18:33:20 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Maxim Levitsky <maximlevitsky@...il.com>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Ingo Molnar <mingo@...e.hu>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, pavel@...e.cz,
	linux-pm@...ts.osdl.org, gregkh@...e.de,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Jens Axboe <jens.axboe@...cle.com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	jgarzik@...ox.com, linux-ide@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...lanox.co.il>
Subject: Re: [PATCH v2] Add suspend/resume for HPET

On Sat, 2007-03-31 at 09:09 -0700, Linus Torvalds wrote:
> 
> On Sat, 31 Mar 2007, Thomas Gleixner wrote:
> > 
> > While I agree in principle with the patch, I'm a bit uncomfortable. The
> > sys device suspend / resume ordering is not guaranteed and relies on the
> > registering order.
> 
> Well, this is why we probably should try to get away from the "system 
> device" issue, exactly because system devices are totally outside the 
> normal ordering and only have a random linear order.
> 
> If the clocksources were actually in the device tree, you'd get all the 
> normal guarantees about hierarchical ordering..

Right, but clock - sources/events need to be extremly late suspended and
early resumed. How can we ensure this ?

	tglx


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