linux-kernel - Re: [PATCH 12/14] dma-direct: handle the memory encryption bit in common code

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Date:   Mon, 19 Mar 2018 16:24:42 +0100
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Christoph Hellwig <hch@....de>, x86@...nel.org,
        Tom Lendacky <thomas.lendacky@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        linux-kernel@...r.kernel.org, Muli Ben-Yehuda <mulix@...ix.org>,
        iommu@...ts.linux-foundation.org,
        David Woodhouse <dwmw2@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH 12/14] dma-direct: handle the memory encryption bit in
        common code

On Mon, Mar 19, 2018 at 03:19:04PM +0000, Robin Murphy wrote:
> As a heads-up, I've just realised there's now a silent (but build-breaking) 
> conflict with the current arm64 queue brewing here, as we've unfortunately 
> had to reintroduce ARCH_HAS_PHYS_TO_DMA as a means of being safe against an 
> ugly architectural corner case - currently commit 1f85b42a691c ("arm64: 
> Revert L1_CACHE_SHIFT back to 6 (64-byte cache line size)") in -next.

Please revert that arm64 commit.  This condition should be handled
in common code as it is not arm specific.  And next time please CC
the iommu list and dma-mapping maintainers before doing such a change.