linux-kernel - Re: [patch] pci: revert "PCI: remove transparent bridge sizing"

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Date:	Wed, 26 Mar 2008 22:47:02 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Gary Hade <garyhade@...ibm.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Meyer <thomas@...3r.de>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>, pm@...ian.org
Subject: Re: [patch] pci: revert "PCI: remove transparent bridge sizing"

> I dunno. I'm not going to do anything in this area before 2.6.25 is out 
> because this *does* make me a bit nervous, but if somebody wants to think 
> about this and perhaps write patches for testing, that would be good.

One way to kill off some of the assumptions and gunge would be to add
pci_resource_assigned(resource) [or indeed just resource_assigned()].
Iomap has similar problems - we have no portable defined "not mapped" at
the moment, although we use NULL technically mmio maps of 0 end up at 0
in the implementation today.

Alan
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