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Date:   Fri, 12 Apr 2019 12:37:16 -0700
From:   Dan Williams <>
To:     Robin Murphy <>
Cc:     Linux MM <>, "Weiny, Ira" <>,
        Jérôme Glisse <>,
        "Oliver O'Halloran" <>, X86 ML <>,
        linuxppc-dev <>,
        Anshuman Khandual <>,
        Linux Kernel Mailing List <>
Subject: Re: [PATCH RESEND 3/3] mm: introduce ARCH_HAS_PTE_DEVMAP

On Fri, Apr 12, 2019 at 12:02 PM Robin Murphy <> wrote:
> ARCH_HAS_ZONE_DEVICE is somewhat meaningless in itself, and combined
> with the long-out-of-date comment can lead to the impression than an
> architecture may just enable it (since __add_pages() now "comprehends
> device memory" for itself) and expect things to work.
> In practice, however, ZONE_DEVICE users have little chance of
> functioning correctly without __HAVE_ARCH_PTE_DEVMAP, so let's clean
> that up the same way as ARCH_HAS_PTE_SPECIAL and make it the proper
> dependency so the real situation is clearer.

Looks good to me.

Acked-by: Dan Williams <>

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