This set of patches implements mutexes as an alternative to semaphores where
such more restricted behaviour is appropriate.
There are several changes that might be appropriate to these patches:
(1) Name DECLARE_MUTEX as DEFINE_MUTEX in linux/mutex-*.h
(2) Make mutex_trylock()'s return value consistent with semaphores rather
than everything else.
(3) Drop the testing module (patch 12/12). I'm not sure I've got the plumbing
correct in the master makefile.
Patches to come after Christmas will include sem -> completion conversions and
sem -> mutex conversions.
Merry Christmas!
David
