Re: [PATCH 2/5] dma-mapping: consolidate dma_{alloc,free}_noncoherent

[Russell King - ARM Linux]

On Thu, Aug 13, 2015 at 05:04:05PM +0200, Christoph Hellwig wrote:
> diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
> index 2ae3424..ab521d5 100644
> --- a/arch/arm/include/asm/dma-mapping.h
> +++ b/arch/arm/include/asm/dma-mapping.h
> @@ -175,21 +175,6 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
>  	return dma_addr == DMA_ERROR_CODE;
>  }
>  
> -/*
> - * Dummy noncoherent implementation.  We don't provide a dma_cache_sync
> - * function so drivers using this API are highlighted with build warnings.
> - */

I'd like a similar comment to remain after this patch explaining that we
don't support non-coherent allocations and that it'll be highlighted by
the lack of dma_cache_sync, otherwise I'm sure we'll start to get patches
to add the thing.

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