From: Nishanth Aravamudan <redacted>
Date: Thu, 29 Oct 2015 08:57:01 -0700

So, would that imply changing just the NVMe driver code rather than
adding the dma_page_shift API at all? What about
architectures that can support the larger page sizes? There is an
implied performance impact, at least, of shifting the IO size down.

Sorry for the continuing questions -- I got lots of conflicting feedback
on the last series and want to make sure v4 is more acceptable.

In the long term I would be very happy to see us having a real interface
for this stuff, just my opinion...