Re: pci_dma64_available() and Xen

[Joerg Sonnenberger <joerg%britannica.bec.de@localhost>]

On Sun, Oct 12, 2008 at 12:17:06AM +0200, Manuel Bouyer wrote:
> What overhead are we talking about ?

Drivers and bus. But looking at the code it seems drivers don't care
right now, so I guess it doesn't matter. E.g. twa could have been a good
example where it can make a difference as the driver can program both a
32bit and 64bit interface to the firmware, but it doesn't do so
conditionally.

Joerg