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SubjectRe: [BK PATCH] PCI Express patches for 2.4.27-pre3
On Tue, May 25, 2004 at 07:40:56AM -0700, Greg KH wrote:
> On Tue, May 25, 2004 at 09:54:53AM -0300, Marcelo Tosatti wrote:
> >
> > Hi kernel fellows,
> >
> > On Tue, May 25, 2004 at 12:32:31PM +0100, Matthew Wilcox wrote:
> > > On Tue, May 25, 2004 at 01:00:06AM -0700, Greg KH wrote:
> > > > > how does this mesh with the "2.4 is now feature frozen"?
> > > >
> > > > As the major chunk of ACPI support just got added to the tree, and the
> > > > only reason that went in was for this patch, I assumed that it was
> > > > acceptable.
> >
> > major? the MMConfig support is minimal as I can see?
>
> It isn't that big of a patch, but it is make to core PCI code.
>
> > > > Marcelo, feel free to tell me otherwise if you do not want
> > > > this in the 2.4 tree.
> >
> > Is this code necessary for PCI-Express devices/busses to work properly?
>
> Not that I can tell, the main point is accessing the extended config
> space, and speeding up the access to the device to its natural speed.
>
> > > I assume it was added because Len tries to keep ACPI in 2.4 and 2.6 as
> > > close to identical as possible. It certainly doesn't hurt anyone to add
> > > the ACPI functionality without the MMConfig support.
> >
> > I've humbly asked Len to stop doing big updates whenever possible on the
> > v2.4 ACPI code, and do bugfixes only instead. Is that a pain in the ass for you, Len?
> >
> > I asked that because it is common to see new bugs introduced by an ACPI update,
> > and you know that more than I do.
>
> Yes, I know that quite well :)
>
> So, because of this, you are saying that we should not apply these
> patches at this time?

Yeap, I would prefer not to apply them at this time. For one, Arjan told
me privately it can break XFree86 which accesses the PCI config space directly.
Right?

> If so, that's fine with me, as now any distro that wants to add this to
> their 2.4 kernel can, as the patches are public.

Yeap.

> > PS: Greg, about the PCI-Express hotplug drivers, I assume they are independant
> > on any of this?
>
> Yes, that is independant of these changes (that is required as there is
> no other way to control the pci hotplug controller of those systems,
> except with the driver I had submitted in the past to you.).
>
> thanks,
>
> greg k-h
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