non barrier versions of dma_map functions

[Russell King - ARM Linux]

On Thu, Dec 10, 2009 at 10:16:49AM -0800, Abhijeet Dharmapurikar wrote:
> Catalin Marinas wrote:
>> What is the direction given to dma_map_single()?
>>
> DMA_TO_DEVICE
>> If the direction is TO_DEVICE, has the buffer been dirtied before
>> calling dma_map_single()? The DSB overhead could be smaller compared to
>> the actual cache flushing.
> Yes the buffers were dirtied before calling  
> dma_map_single(...DMA_TO_DEVICE);

Well, I don't think we can extend the API like this without cross-platform
agreement.