The first patch in the series makes the deadlock detector work again.
The second is removing the rtmutex tester as with the current
implementation of the lock chain walk plus the demise of the lock
steal mechanism and the BKL extra logic, we can now build a tester in
userspace via the futex syscall.
The other patches clarify and optimize the deadlock detection logic
and the lock chain walk mechanism.
Thanks,
Thomas
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