Re: [PATCH-RFC 07/10] parisc: switch to GENERIC_PCI_IOMAP

["Michael S. Tsirkin" <mst@redhat.com>]

On Sun, Dec 04, 2011 at 08:22:34AM -0600, James Bottomley wrote:
> On Sun, 2011-12-04 at 12:48 +0200, Michael S. Tsirkin wrote:
> > On Thu, Nov 24, 2011 at 10:19:34PM +0200, Michael S. Tsirkin wrote:
> > > parisc copied pci_iomap from generic code, probably to avoid
> > > pulling the rest of iomap.c in.  Since that's in
> > > a separate file now, we can reuse the common implementation.
> > > 
> > > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> > 
> > Sorry to nag, any ACKs/NACKs on the parisc part?
> > I intend to send this to Linus if there are no
> > objections. Thanks!
> 
> Next time, send the patch to linux-arch or linux-parisc ... it helps to
> get people to review it. Although this one looks completely trivial,
> unless I'm missing something?

I think it's trivial but I don't have the setup to even compile it so
depend on someone to ack.

> Obviously there was a bit of a brain fart when this was done: the parisc
> piece shouldn't be a copy of the generic code: we don't have native i/o
> ports and emulation is pretty expensive, so we should prefer
> IORESOURCE_MEM over IORESOURCE_IO when both are available  ... but even
> on x86, memory mapping is faster (although not by the order of magnitude
> it is on parisc), so it looks like you could fix this in the generic
> code.
> 
> James

AFAIK, on PCI a resource is either IO or MEM, but never both.
What am I missing?

-- 
MST