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Date: Thu, 31 Oct 2019 18:06:19 +0000
From: Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH] dma/direct: turn ARCH_ZONE_DMA_BITS into a variable
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To: Christoph Hellwig <hch@lst.de>
Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>, Marek Szyprowski <m.szyprowski@samsung.com>, Robin Murphy <robin.murphy@arm.com>, Will Deacon <will@kernel.org>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au>, Heiko Carstens <heiko.carstens@de.ibm.com>, Vasily Gorbik <gor@linux.ibm.com>, Christian Borntraeger <borntraeger@de.ibm.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, iommu@lists.linux-foundation.org

On Thu, Oct 31, 2019 at 05:58:53PM +0100, Christoph Hellwig wrote:
> On Thu, Oct 31, 2019 at 05:22:59PM +0100, Nicolas Saenz Julienne wrote:
> > OK, I see what you mean now. It's wrong indeed.
> > 
> > The trouble is the ZONE_DMA series[1] in arm64, also due for v5.5, will be
> > affected by this patch. I don't know the right way to approach this problem
> > since depending on the merge order, this patch should be updated or the arm64
> > ZONE_DMA series fixed.
> > 
> > Maybe it's easier to just wait for v5.6.
> 
> Ok, I can wait.  Or the arm64 maintainers can pick up this patch if
> you want to add it to that series.

This branch is stable (may add a fix but not I'm not rebasing it) if you
want to base this patch on top:

https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=for-next/zone-dma

Otherwise, with your ack, I can add it on top of the above branch (aimed
at 5.5).

-- 
Catalin