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From:   Rob Herring <robh+dt@kernel.org>
Date:   Thu, 30 Nov 2023 08:56:23 -0600
Message-ID: <CAL_JsqJ+V_=um5+Kz1AofDxx8_gqdWGeYqPdaxMDV1HiPsvq=A@mail.gmail.com>
Subject: Re: [PATCH 2/7] OF: Simplify DMA range calculations
To:     Robin Murphy <robin.murphy@arm.com>
Cc:     Joerg Roedel <joro@8bytes.org>, Christoph Hellwig <hch@lst.de>,
        Vineet Gupta <vgupta@kernel.org>,
        Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Huacai Chen <chenhuacai@kernel.org>,
        WANG Xuerui <kernel@xen0n.name>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Lorenzo Pieralisi <lpieralisi@kernel.org>,
        Hanjun Guo <guohanjun@huawei.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        Niklas Schnelle <schnelle@linux.ibm.com>,
        Matthew Rosato <mjrosato@linux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
        Jean-Philippe Brucker <jean-philippe@linaro.org>,
        Frank Rowand <frowand.list@gmail.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Jason Gunthorpe <jgg@ziepe.ca>, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org,
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On Wed, Nov 29, 2023 at 11:43=E2=80=AFAM Robin Murphy <robin.murphy@arm.com=
> wrote:
>
> Juggling start, end, and size values for a range is somewhat redundant
> and a little hard to follow. Consolidate down to just using inclusive
> start and end, which saves us worrying about size overflows for full
> 64-bit ranges (note that passing a potentially-overflowed value through
> to arch_setup_dma_ops() is benign for all current implementations, and
> this is working towards removing that anyway).
>
> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
> ---
>  drivers/of/device.c | 19 ++++++++-----------
>  1 file changed, 8 insertions(+), 11 deletions(-)

Acked-by: Rob Herring <robh@kernel.org>