linux-kernel - Re: [PATCH v3.1 4/4] arm64: mm: Implement pte

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Message-ID: <20190529100338.GB4485@fuggles.cambridge.arm.com>
Date:   Wed, 29 May 2019 11:03:38 +0100
From:   Will Deacon <will.deacon@....com>
To:     Robin Murphy <robin.murphy@....com>, akpm@...ux-foundation.org
Cc:     catalin.marinas@....com, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3.1 4/4] arm64: mm: Implement pte_devmap support

On Tue, May 28, 2019 at 02:46:59PM +0100, Robin Murphy wrote:
> In order for things like get_user_pages() to work on ZONE_DEVICE memory,
> we need a software PTE bit to identify device-backed PFNs. Hook this up
> along with the relevant helpers to join in with ARCH_HAS_PTE_DEVMAP.
> 
> Signed-off-by: Robin Murphy <robin.murphy@....com>
> ---
> 
> Fix to build correctly under all combinations of
> CONFIG_PGTABLE_LEVELS and CONFIG_TRANSPARENT_HUGEPAGE.
> 
>  arch/arm64/Kconfig                    |  1 +
>  arch/arm64/include/asm/pgtable-prot.h |  1 +
>  arch/arm64/include/asm/pgtable.h      | 21 +++++++++++++++++++++
>  3 files changed, 23 insertions(+)

Acked-by: Will Deacon <will.deacon@....com>

Andrew -- please can you update the previous version of this patch, which
I think you picked up?

Thanks,

Will