linux-kernel - Re: [PATCH RESEND 3/3] mm: introduce ARCH_HAS_PTE

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Date:   Mon, 15 Apr 2019 17:00:35 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Robin Murphy <robin.murphy@....com>, linux-mm@...ck.org
Cc:     dan.j.williams@...el.com, ira.weiny@...el.com, jglisse@...hat.com,
        oohall@...il.com, x86@...nel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 3/3] mm: introduce ARCH_HAS_PTE_DEVMAP



On 04/13/2019 12:31 AM, 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 with the long-out-of-date comment can lead to the impression than an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.
> 
> Signed-off-by: Robin Murphy <robin.murphy@....com>

Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>