Re: [PATCH 5/5] mm: cleanup pfn_t usage in track_pfn_insert()

[Andrew Morton]

On Tue, 06 Sep 2016 09:49:47 -0700 Dan Williams <dan.j.willi...@intel.com> 
wrote:

> Now that track_pfn_insert() is no longer used in the DAX path, it no
> longer needs to comprehend pfn_t values.

What's the benefit in this?  A pfn *should* have type pfn_t, shouldn't
it?   Confused.