... only because spinlocks are no-op on UP.
> spinlocks internaly will be initialized as
> recursive semaphore as default. So it is possible to aquire it more than
> once by the same thread.
Spinlocks are *not* recursive. The code above is a bug - it's just that
on non-SMP it doesn't get caught.
Spinlock is a mutex, not a recursive sempahore.
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