consistent_free()

[David Gibson <david@gibson.dropbear.id.au>]

In attempting to make consistent_alloc/free() work sensibly on
processors which are cache coherent I ran into a problem.
consistent_free() doesn't take a size argument.  We don't need it in
the case of not cache coherent processors - in that case
consistent_alloc() sets up a vm_area() so there's enough information
to get the size.  However for cache coherent processors we probably
want consistent_alloc() to degenerate to __get_free_pages(), in which
case consistent_free() must degenerate to free_pages(), which takes a
size argument.

I suggest we change consistent_free() to take the virtual addresss,
size and the physical address (dma_addr_t), which will make our
consistent_free() match the one on ARM.  I know we don't need the
third argument in any existing situation.

Patch coming...

--
David Gibson			| For every complex problem there is a
david@gibson.dropbear.id.au	| solution which is simple, neat and
				| wrong.  -- H.L. Mencken
http://www.ozlabs.org/people/dgibson

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