linux-kernel - Re: modular intel-agp does not work on my box

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Date:	Sat, 23 Feb 2008 20:30:31 +0100
From:	Gabriel C <crazy@...galware.org>
To:	Dave Jones <davej@...emonkey.org.uk>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Gabriel C <nix.or.die@...glemail.com>,
	Dave Airlie <airlied@...ux.ie>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Gabriel C <crazy@...galware.org>,
	Doug Thompson <dougthompson@...ssion.com>,
	Greg KH <greg@...ah.com>
Subject: Re: modular intel-agp does not work on my box

Dave Jones wrote:
> On Sat, Feb 23, 2008 at 12:03:55AM -0800, Andrew Morton wrote:
>  
>  > >  > You are right without EDAC built , agp modular does work fine. I'm on 2.6.25-rc2-00477-g1a4c6be right now.
>  > >  > So it is an EDAC bug ?
>  > >  
>  > > No, it's a failing of the pci driver model. It currently doesn't
>  > > allow more than one driver to be bound to a single PCI device.
>  > > For multi-function devices like bridges, this means we see problems
>  > > like the one you mention.
>  > 
>  > Well that sounds pretty bad.  What will distros do about this?
> 
> either
> *  ship both modular, and let the user decide which one he wants.

If you do so you have to blacklist one by default because udev will magically load both.

> *  build just one of them (typically agp)
> *  build them both, and let the above bug happen

Well the bug was not with both build into the kernel. 
CONFIG_EDAC=Y CONFIG_EDAC_<something>=m, CONFIG_AGP=m CONFIG_AGP_INTEL=m breaks agp already.

> *  build agp into the kernel, and edac modular, breaking edac
>    for a minority.

What does happen if one builds both into the kernel ? ( eg: all the *_AGP* Y , and all the *_EDAC* y ) 

Guessing no one of them will work ?

>  
>  > Is there something short-term-and-sleazy we can do to "fix" it?
> 
> not that I'm aware of.  I think Greg has been working on a long-term fix.
> 
> 	Dave
> 

Gabriel
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