Export the interface to be used within modules.
Signed-off-by: NMatias Bjorling <m@bjorling.me>
Acked-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>