dax: integrate *sync code & multi-order radix tree

With the new addition of the multi-order radix tree support we can simplify
the DAX *sync PMD support a bit.  Instead of manually checking to see if
our index is covered by a PMD entry we can rely on the new radix tree to
return the PMD entry if present.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
1 file changed