linux-kernel - Re: [PATCH RFC 1/5] dma/direct: turn ARCH_ZONE_DMA

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Message-ID: <20191031133831.GA21509@infradead.org>
Date:   Thu, 31 Oct 2019 06:38:31 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        Marek Szyprowski <m.szyprowski@...sung.com>, mbrugger@...e.com,
        f.fainelli@...il.com, wahrenst@....net,
        Catalin Marinas <catalin.marinas@....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-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH RFC 1/5] dma/direct: turn ARCH_ZONE_DMA_BITS into a
 variable

On Thu, Oct 31, 2019 at 11:30:36AM +0100, Nicolas Saenz Julienne wrote:
> On Wed, 2019-10-30 at 14:49 -0700, Christoph Hellwig wrote:
> > On Mon, Oct 14, 2019 at 08:31:03PM +0200, Nicolas Saenz Julienne wrote:
> > > Some architectures, notably ARM, are interested in tweaking this
> > > depending on their runtime DMA addressing limitations.
> > > 
> > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> > 
> > Do you want me to pick this up for the 5.5 dma-mapping tree, or do you
> > want me to wait for the rest to settle?
> 
> I'd say take it, this will be ultimately needed once we push forward with ARM.

Can you resend a version that applies against 5.4-rc?  The current one
has conflicts in the arm64 code.