linux-kernel - Re: [PATCH 4/9] arm64: dma-mapping: export symbol arch_setup_dma

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Date:   Thu, 12 Oct 2017 14:15:30 -0400
From:   Jim Quinlan <jim2101024@...il.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        linux-mips@...ux-mips.org, Florian Fainelli <f.fainelli@...il.com>,
        devicetree@...r.kernel.org, linux-pci <linux-pci@...r.kernel.org>,
        Kevin Cernekee <cernekee@...il.com>,
        Will Deacon <will.deacon@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Rob Herring <robh+dt@...nel.org>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Brian Norris <computersforpeace@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/9] arm64: dma-mapping: export symbol arch_setup_dma_ops

On Thu, Oct 12, 2017 at 1:06 PM, Robin Murphy <robin.murphy@....com> wrote:
> On 11/10/17 23:34, Jim Quinlan wrote:
>> The BrcmSTB driver needs to get ahold of a pointer to swiotlb_dma_ops.
>> However, that variable is defined as static.  Instead, we use
>> arch_setup_dma_ops() to get the pointer to swiotlb_dma_ops.  Since
>> we also want our driver to be a separate module, we need to
>> export this function.
>
> NAK. Retrieve the platform-assigned ops from the device via
> get_dma_ops() and stash them in your drvdata or wherever before you
> replace them. Don't go poking around arch code internals directly from a
> driver.
Will fix (and drop the commit).

>
> Robin.
>
>> Signed-off-by: Jim Quinlan <jim2101024@...il.com>
>> ---
>>  arch/arm64/mm/dma-mapping.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
>> index 614af88..dae572f 100644
>> --- a/arch/arm64/mm/dma-mapping.c
>> +++ b/arch/arm64/mm/dma-mapping.c
>> @@ -936,3 +936,4 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
>>       }
>>  #endif
>>  }
>> +EXPORT_SYMBOL(arch_setup_dma_ops);
>>
>