[PATCH v2 4/7] scatterlist: add sg_alloc_table_from_buf() helper

[Mark Brown]

On Wed, Mar 30, 2016 at 05:39:51PM +0200, Boris Brezillon wrote:
> sg_alloc_table_from_buf() provides an easy solution to create an sg_table
> from a virtual address pointer. This function takes care of dealing with
> vmallocated buffers, buffer alignment, or DMA engine limitations (maximum
> DMA transfer size).

This seems nice.  Should we also have a further helper on top of this
which will get constraints from a dmaengine, it seems like it'd be a
common need?
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