Re: [PATCH 2/3] x86_64: Define 128-bit memory-mapped I/O operations

On Wed, Aug 22, 2012 at 8:05 AM, David Laight [off-list ref] wrote:

PCIe transfers are basically hdlc packets containing the address,
command and any associated data. Unless they get bridged
though some strange PCIe<->PCI<->PCIe system they are very
unlikely to get broken up.

It's exactly the odd kind of "mix in a non-native PCIe bridge" setups
I'd worry about. But I guess that is pretty unlikely in any modern
machine (except for thunderbolt, and I think that's going to pass any
PCIe stuff through unchanged).

                  Linus