Having looked at this some, I have one, tiny little suggestion:

quoted text
> +With this mapping object, individual pages can be mapped either
> atomically +or not, depending on the necessary scheduling
> environment. Of course, atomic +maps are more efficient:
> +
> +	void *io_mapping_map_atomic_wc(struct io_mapping *mapping,
> +				       unsigned long offset)

Should the documentation for this function (perhaps the
certainly-forthcoming kerneldoc comments :) mention loudly that this
function uses KM_USER0?  This isn't kmap(), and doesn't look much like
it; someday some developer might get an ugly surprise when they try to
use that slot simultaneously for something else.

jon
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