Re: [Patch] Janitorial cleanup of GET_INDEX macro in arch/i386/pci/fixup.c

[Jeff Garzik]

Greg KH wrote:
> On Mon, Jun 27, 2005 at 03:19:11PM -0700, Linus Torvalds wrote:
>
> > On Mon, 27 Jun 2005, Neil Horman wrote:
> >
> > > Patch to clean up the implementation of the GET_INDEX macro in the i386 pci
> > > fixup code so that it uses the PCI_DEVFN macro, rather than re-implements it.
> >
> > This looks wrong:
> >
> >
> > > -#define GET_INDEX(a, b) ((((a) - PCI_DEVICE_ID_INTEL_MCH_PA) << 3) + ((b) & 7))
> > > +#define GET_INDEX(a, b) PCI_DEVFN((a - PCI_DEVICE_ID_INTEL_MCH_PA),b)
> >
> > that first argument looks like it has parentheses at the wrong place, it 
> > should be
> >
> > 	(a) - PCI_DEVICE_ID_INTEL_MCH_PA
> >
> > rather than
> >
> > 	(a - PCI_DEVICE_ID_INTEL_MCH_PA)
> >
> > methinks.
> >
> > Other than that... Greg?
>
>
> I'd like to say yes, but I'll get an ack by the pci express people from
> Intel first (PCI_DEVFN masks off bits that might be needed here, don't
> really know...)  Also, this is only used for an array index, not a
> pci devfn memory access (look at how it is used in the code...)
>
> I'll put it in my tree for now, and let it get testing, I would not
> recommend it for yours just yet.

Please let me know, as I suggested this patch to Neil.

It sure seems like the code wants a real PCI devfn, even though it is 
obviously doing a table index.

Comments?

	Jeff



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