[PATCH 0/12]: MUTEX: Introduce mutex implementation

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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
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