linux-kernel - Re: [PATCH 1/3] resource: shared I/O region support

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Message-ID: <20100329193933.1a04762b@lxorguk.ukuu.org.uk>
Date:	Mon, 29 Mar 2010 19:39:33 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Giel van Schijndel <me@...tis.eu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Jonathan Cameron <jic23@....ac.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	Laurens Leemans <laurens@...nips.com>,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] resource: shared I/O region support

> What I *really* object to with this patch is that it inherently assumes
> that there is only one multiplexed resource in the entire system... but
> of course nowhere enforces that.

The patch does nothing of the sort. Not unless there is a bug I am not
seeing anyway. It does assume nobody tries to grab pairs of such
resources as it doesn't do deadlock avoidance.

It's now a shared resource patch however, its a multiplexor patch and
that is precisely why it is called MUX not SHARED or OVERLAY
Alan
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