Skip cache sync for GEM CMA objects?

[Steve Longerbeam]

Hi all,

GEM CMA uses dma_alloc_writecombine() when allocating the CMA objects.
So IINM the GEM buffers are cache coherent. So is there any reason why
DMA_ATTR_SKIP_CPU_SYNC is not passed to dma_map_sg() when GEM CMA
prepares the buffer for dma on behalf of the dma-buf user? Is this just an
oversight or is there something I have missed?

Thanks,
Steve