Generic lock debugging:

- generalized lock debugging framework. For example, a bug in one lock
subsystem turns off debugging in all lock subsystems.

- got rid of the caller address passing (__IP__/__IP_DECL__/etc.) from
the mutex/rtmutex debugging code: it caused way too much prototype
hackery, and lockdep will give the same information anyway.

- ability to do silent tests

- check lock freeing in vfree too.

- more finegrained debugging options, to allow distributions to
turn off more expensive debugging features.

There's no separate 'held mutexes' list anymore - but there's a 'held locks'
stack within lockdep, which unifies deadlock detection across all lock
classes. (this is independent of the lockdep validation stuff - lockdep first
checks whether we are holding a lock already)

Here are the current debugging options:

CONFIG_DEBUG_MUTEXES=y
CONFIG_DEBUG_LOCK_ALLOC=y

which do:

config DEBUG_MUTEXES
bool "Mutex debugging, basic checks"

config DEBUG_LOCK_ALLOC
bool "Detect incorrect freeing of live mutexes"

Signed-off-by: Ingo Molnar
Signed-off-by: Arjan van de Ven
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds