Re: remove the ->mapping_error method from dma_map_ops V2

[Christoph Hellwig]

On Thu, Nov 29, 2018 at 10:53:32AM -0800, Linus Torvalds wrote:
> Most of the high-performance IO is already using SG lists anyway, no?
> Disk/networking/whatever.

Networking basically never uses S/G lists.  Block I/O mostly uses it,
and graphics / media seems to have a fair amount of S/G uses, including
very, erm special ones.