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    SubjectRE: [PATCH] improve spinlock debugging

    > Tested on i386/UP, but it should work on all platforms. It contains
    > runtime checks for:
    > - missing initialization
    > - recursive lock
    > - double unlock
    > - incorrect use of spin_is_locked() or spin_trylock() [both function
    > do not work as expected on uniprocessor builds]
    > The next step are checks for spinlock ordering mismatches.
    > Which other runtime checks are possible?

    It's very useful to log when a lock(irq) is held more than xx ms
    and who is the caller. Is it possible ?


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