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.
Ingo
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