linux-kernel - Re: [lm-sensors] Could the k8temp driver be interfering with ACPI?

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Message-ID: <20070305222548.GA4946@ucw.cz>
Date:	Mon, 5 Mar 2007 22:25:48 +0000
From:	Pavel Machek <pavel@....cz>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Rudolf Marek <r.marek@...embler.cz>,
	linux-acpi@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	lm-sensors@...sensors.org
Subject: Re: [lm-sensors] Could the k8temp driver be interfering with ACPI?

Hi!

> > > Why would we end up with an overestimation if we check the I/O ports at
> > > boot time? Do you have concrete cases in mind?
> > 
> > ACPI will often describe large operation regions, but won't necessarily 
> > touch all of them. Effectively, every codepath would have to be walked 
> > through at boot time and checked for io access.
> 
> Is there anything preventing us from doing such a walk and pre-allocate
> all the I/O ranges? I am not familiar with the ACPI code at all, would
> you possibly propose a patch doing that?

ACPI AML is probably turing-complete: I'm afraid you are trying to
solve the halting problem (-> impossible).
						Pavel

> 
> If we can't do that, the overestimation approach might still work. I
> wonder if it would cause problems in practice. If it does, we're back
> to Pavel's AML lock.
> 
> -- 
> Jean Delvare

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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