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From: Dan Williams <dan.j.williams@intel.com>
Date: Thu, 7 Jun 2018 11:39:44 -0700
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Subject: Re: [PATCH 0/5] mm: rework hmm to use devm_memremap_pages
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Sender: owner-linux-mm@kvack.org
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To: Jerome Glisse <jglisse@redhat.com>
Cc: Dave Airlie <airlied@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Logan Gunthorpe <logang@deltatee.com>, Christoph Hellwig <hch@lst.de>, Michal Hocko <mhocko@suse.com>, Linux MM <linux-mm@kvack.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>

On Thu, Jun 7, 2018 at 7:16 AM, Jerome Glisse <jglisse@redhat.com> wrote:
[..]
> HMM is self contain interface but i doubt i can convince you of that.

I agree that HMM is self contained... after it completely subverts the
core-mm. It's that deep understanding and working around of core
memory management infrastructure that makes devm_memremap_pages() and
derivatives EXPORT_SYMBOL_GPL ("considered an
internal implementation issue, and not really an interface").