On Sun, May 08, 2016 at 03:35:10PM -0700, Dan Williams wrote:

Device DAX is the device-centric analogue of Filesystem DAX
(CONFIG_FS_DAX).  It allows memory ranges to be allocated and mapped
without need of an intervening file system or being bound to block
device semantics.  Device DAX is strict and predictable.  Specifically
this interface:

Can you explain the "why" a little more?

And please, if you decide to Cc me on some of the patches do it for the
whole series or none of it, but never just for some patches as that make
the cc pretty pointless.