Subject: Re: [patch] Make MMCONFIG space (extended PCI config space) a
	driver opt-in issue
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reply-To: benh@kernel.crashing.org
To: Matthew Wilcox <matthew@wil.cx>
Cc: Arjan van de Ven <arjan@infradead.org>, Jeff Garzik <jeff@garzik.org>,
       linux-kernel@vger.kernel.org, gregkh@suse.de,
       linux-pci@atrey.karlin.mff.cuni.cz, torvalds@linux-foundation.org
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	 <20071222155436.GS29690@parisc-linux.org>
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Date: Mon, 24 Dec 2007 10:33:27 +1100
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> I've occasionally wondered if that spinlock needs to get split up, but
> for the amount of pain that could ensue, I can't imagine it ever being
> worthwhile.

Wondered the same thing and decided against it. I do have every now and
then some really crazy cases to deal with. One of them is the need to
use something like fixmap/kmap_atomic because a vendors makes 32 bits
CPUs that need 512MB of address space to map config space :-)

Ben.


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