I don't see how that could block for very long.
The number of instructions in the critical section is not relevant if the thread holding the lock gets pre-empted. That's the definition of priority inversion.
Of course the shorter the critical section, the less likely priority inversion will ever happen.
@Michael, I guess you need to also consider whether lock contention is actually possible. A spinlock on a never-contended lock would be safe for example.
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