From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Subject: Re: [PATCH 12/14] dma-direct: handle the memory encryption bit in
	common code
Date: Mon, 19 Mar 2018 16:24:42 +0100
Message-ID: <20180319152442.GA27915@lst.de>
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To: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
Cc: Tom Lendacky <thomas.lendacky-5C7GfCeVMHo@public.gmane.org>, Konrad Rzeszutek Wilk <konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>, Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Muli Ben-Yehuda <mulix-BzGcCpaT2IbYtjvyW6yDsg@public.gmane.org>, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>, Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
List-Id: iommu@lists.linux-foundation.org

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.