linux-kernel - Re: [PATCH 01/24] arm64/iommu: handle non-remapped addresses in ->mmap and ->get

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Message-ID: <20190522125447.GB7876@fuggles.cambridge.arm.com>
Date:   Wed, 22 May 2019 13:54:47 +0100
From:   Will Deacon <will.deacon@....com>
To:     Christoph Hellwig <hch@....de>
Cc:     Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Tom Murphy <tmurphy@...sta.com>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/24] arm64/iommu: handle non-remapped addresses in
 ->mmap and ->get_sgtable

On Mon, May 20, 2019 at 09:29:25AM +0200, Christoph Hellwig wrote:
> DMA allocations that can't sleep may return non-remapped addresses, but
> we do not properly handle them in the mmap and get_sgtable methods.
> Resolve non-vmalloc addresses using virt_to_page to handle this corner
> case.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> Reviewed-by: Robin Murphy <robin.murphy@....com>
> Acked-by: Catalin Marinas <catalin.marinas@....com>
> ---
>  arch/arm64/mm/dma-mapping.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)

I'll send this one to Linus this week as part of the arm64 fixes.

Will