Russell King - ARM Linux wrote:
On Wed, Feb 10, 2010 at 01:27:47PM -0800, Randy Dunlap wrote:
On 02/10/10 12:37, adharmap@xxxxxxxxxxxxxx wrote:
From: Abhijeet Dharmapurikar <adharmap@xxxxxxxxxxx>
Please refer to the post here
http://lkml.org/lkml/2010/1/4/347
These changes are to introduce barrierless dma_map_area and dma_unmap_area and
use them to map the buffers in the scatterlist. For the last buffer, call
the normal dma_map_area(aka with barriers) effectively executing the barrier
at the end of the operation.
Note that the barrierless operations are implemented for few arm
architectures only and I would implement for others once these are okayed by the
community.
So when you add these interfaces for other architectures, you will also
update Documentation/DMA-API.txt, right??
Do we need barrier-less interfaces for anything other than the dma_*_sg
functions?
I think, dma_*_sg are the only ones that could benefit from barrier-less
interfaces.
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