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Kernel lock validator
From Ingo Molnar and Arjan van de Ven
Adds instrumentation to kernel locking code
Detect violations of locking rules during system life, such as:
- Locks acquired in different order
(keeps track of locking sequences and compares them).
- Spinlocks acquired in interrupt handlers and also in process context when interrupts are enabled.
Not suitable for production systems but acceptable overhead in development.