Convert to the much saner new idr interface.
Signed-off-by: NTejun Heo <tj@kernel.org>
Tested-by: NEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>