linux-kernel - Re: [patch] Make MMCONFIG space (extended PCI config space) a driver opt-in issue

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Message-ID: <476DF0A3.9070701@garzik.org>
Date:	Sun, 23 Dec 2007 00:22:43 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, gregkh@...e.de,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [patch] Make MMCONFIG space (extended PCI config space) a driver
 opt-in issue

Linus Torvalds wrote:
> On Sun, 23 Dec 2007, Jeff Garzik wrote:
>>> And yes, if you want the capability following to notice automatically when
>>> capabilities really do go into the 0x100+ range, that's fine. I suspect 
>> Yes, we /must/ do this checking, if we don't already.
> 
> Hell no. If the user asked for mmconfig to be disabled, it needs to be 
> disabled, because it may well be broken and non-working. It's better to 
> not see some capabilities than to lock up the machine.

I think my short response created confusion.  I was only saying that we 
should check for capability overruns, if we don't already[1].

I wasn't saying anything about mmconfig in that sentence, sorry.

Let's pop this sub-thread off the stack, and jump to your "Sounds like a 
plan?" train of thought.

	Jeff



[1] Lioc's response seems to imply my worry about overruns is unfounded.
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