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Date:   Fri, 12 Apr 2019 12:12:49 -0700
From:   Dan Williams <>
To:     Robin Murphy <>
Cc:     Linux MM <>, "Weiny, Ira" <>,
        Jérôme Glisse <>,, X86 ML <>,
        linuxppc-dev <>,
        Anshuman Khandual <>,
        Linux Kernel Mailing List <>
Subject: Re: [PATCH 1/3] mm/memremap: Rename and consolidate SECTION_SIZE

On Fri, Apr 12, 2019 at 11:57 AM Robin Murphy <> wrote:
> Trying to activatee ZONE_DEVICE for arm64 reveals that memremap's


> internal helpers for sparsemem sections conflict with and arm64's
> definitions for hugepages, which inherit the name of "sections" from
> earlier versions of the ARM architecture.
> Disambiguate memremap (and now HMM too) by propagating sparsemem's PA_
> prefix, to clarify that these values are in terms of addresses rather
> than PFNs (and because it's a heck of a lot easier than changing all the
> arch code). SECTION_MASK is unused, so it can just go.

Looks good to me. So good that it collides with a similar change in
the "sub-section" support series.

Acked-by: Dan Williams <>

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