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Subject[RFC 0/2] fix dma_map_sg not to do barriers for each buffer
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From: Abhijeet Dharmapurikar <adharmap@quicinc.com>

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.

Abhijeet Dharmapurikar (2):
dma: define barrierless versions of map and unmap area
dma: fix scatter-gather api to use barrierless map/unmap functions

arch/arm/include/asm/cacheflush.h | 9 +++
arch/arm/include/asm/dma-mapping.h | 82 +++++++++++++++++++++
arch/arm/mm/cache-v3.S | 6 ++
arch/arm/mm/cache-v4.S | 6 ++
arch/arm/mm/cache-v4wb.S | 94 +++++++++++++++++-------
arch/arm/mm/cache-v4wt.S | 6 ++
arch/arm/mm/cache-v6.S | 139 +++++++++++++++++++++++++----------
arch/arm/mm/cache-v7.S | 120 +++++++++++++++++++++++--------
arch/arm/mm/dma-mapping.c | 55 +++++++++++++--
9 files changed, 414 insertions(+), 103 deletions(-)



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