[Intel-gfx] [PATCH 1/6] lib/scatterlist: add sg_set_dma_addr() function

[Christoph Hellwig]

On Wed, Mar 11, 2020 at 02:51:53PM +0100, Christian König wrote:
> This can be used by drivers to setup P2P DMA between device
> memory which is not backed by struct pages.
> 
> The drivers of the involved devices are responsible for
> setting up and tearing down DMA addresses as necessary
> using dma_map_resource().
> 
> The page pointer is set to NULL and only the DMA address,
> length and offset values are valid.

NAK.  The only valid way to fill DMA address in scatterlists is
dma_map_sg / dma_map_sg_attr.