linux-kernel - Re: [PATCH v2] dma-mapping: treat dev->bus_dma

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Date:   Thu, 21 Nov 2019 16:53:48 +0000
From:   Will Deacon <will@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Robin Murphy <robin.murphy@....com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Jens Axboe <axboe@...nel.dk>, Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        James Hogan <jhogan@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-ide@...r.kernel.org,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH v2] dma-mapping: treat dev->bus_dma_mask as a DMA limit

On Thu, Nov 21, 2019 at 05:02:17PM +0100, Christoph Hellwig wrote:
> On Thu, Nov 21, 2019 at 03:55:39PM +0000, Robin Murphy wrote:
> > Hmm, there's no functional dependency though, is there? AFAICS it's 
> > essentially just a context conflict. Is it worth simply dropping (or 
> > postponing) the local renaming in __dma_direct_optimal_gfp_mask(), or 
> > perhaps even cross-merging arm64/for-next/zone-dma into dma/for-next?
> 
> I would have no problem with pulling it in.  I'd kinda hate creating
> the conflict, though.  So if the arm64 maintainers are fine with it
> I'll pull it in, especially if I get an ACK from Robin.

Please go ahead and pull in our for-next/zone-dma branch if you need it.
We're not going to rebase it, and I suspect we won't even be queueing
anything else there at this stage in the game.

Cheers,

Will