the other thing that is pretty ugly is the recursive_enter/clear/exit code. I'd suggest the lockdep model here: use a single flag in task_struct to detect recursion. Also, never use BUG() when hitting a bug in a debugging helper - that will crash the box. Use a flag to turn off the whole thing if you encounter an internal bug and print a warning. That way bugs can actually be reported, instead of users wondering why the box locked up under X.
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