Re: [RFC] i386: per-cpu mmconfig map

From: Arjan van de Ven
Date: Sun Dec 24 2006 - 12:17:11 EST

On Mon, 2006-12-25 at 02:05 +0900, OGAWA Hirofumi wrote:
> Hi,
> [ Alternatively, we could make a per-cpu mapping area or something. Not
> that it's probably worth it, but if we wanted to avoid all locking and
> instead just disable preemption, that would be the way to go. --Linus ]
> This patch is a draft of Linus's suggestion. This seems work for me.
> And this removes pci_config_lock in mmconfig access path, I think we
> don't need lock on this path, although we need to disable IRQ.
> Comment?


I like the idea and the implementation, I have just one concern:
Does your schema still work if the Non-Maskable-Interrupt code uses
config space? It may do that I suspect to deal with ECC memory errors ;(

Arjan van de Ven

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