linux-kernel - Re: [PATCH] dma/direct: turn ARCH_ZONE_DMA

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Message-ID: <20191031183255.GA10116@lst.de>
Date:   Thu, 31 Oct 2019 19:32:55 +0100
From:   Christoph Hellwig <hch@....de>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Christoph Hellwig <hch@....de>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] dma/direct: turn ARCH_ZONE_DMA_BITS into a variable

On Thu, Oct 31, 2019 at 06:06:19PM +0000, Catalin Marinas wrote:
> 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).

Please go ahead:

Acked-by: Christoph Hellwig <hch@....de>