Re: [RFC 0/2] fix dma_map_sg not to do barriers for each buffer

[Abhijeet Dharmapurikar]

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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