Re: [PATCH 4/9] arm64: dma-mapping: export symbol arch_setup_dma_ops

[Robin Murphy]

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.

Robin.

> Signed-off-by: Jim Quinlan <jim2101024@xxxxxxxxx>
> ---
>  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);
>