[openib-general] [PATCH 1/7] IB/core - Add DMA mapping functions to allow device drivers to interpose

[Roland Dreier]

 > I have mentioned this to Ralph in the past, just want to get ack/nak
 > on that from you: also on 64bit arch a block driver (eg SCSI LLD eg
 > SRP/iSER/etc) might get from higher level an SG whose pages are
 > **not** mapped into the kernel virtual address space. For example this
 > can happen with Direct I/O.

No, I don't see how that could happen.  Aren't all pages always mapped
by the the kernel direct mapping on 64-bit architectures?

 - R.