It looks drivers/media/video/video-buf.c uses alloc_kiovec() and
map_user_kiobuf() to do it. And I think Ben LaHaise was talking about
removing these functions and creating some other, lightweight
interface for the same purpose? OTOH, it's been awhile since I looked
at this stuff, so I'm not sure how it works anymore, I'm sure someone
else could provide more useful info.
Jesse
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