Andrew requested I comment all the lockdep WARN()s to help other people
figure out wth is wrong..
Requested-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1315301493.3191.9.camel@twinsSigned-off-by: NIngo Molnar <mingo@elte.hu>