linux-kernel - Re: [PATCH 0/5] mm: rework hmm to use devm_memremap

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Message-ID: <CAPcyv4gSn6O+rWYxAfqjkY6pkGAjvTNRUeMY1Ynde3_Vw6gTUA@mail.gmail.com>
Date:   Thu, 7 Jun 2018 11:39:44 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Jerome Glisse <jglisse@...hat.com>
Cc:     Dave Airlie <airlied@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        Christoph Hellwig <hch@....de>, Michal Hocko <mhocko@...e.com>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/5] mm: rework hmm to use devm_memremap_pages

On Thu, Jun 7, 2018 at 7:16 AM, Jerome Glisse <jglisse@...hat.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").