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Date: Tue, 6 Sep 2016 13:20:01 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-nvdimm@ml01.01.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/5] mm: cleanup pfn_t usage in track_pfn_insert()
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On Tue, 06 Sep 2016 09:49:47 -0700 Dan Williams <dan.j.williams@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.