Nigel Gamble writes:
 > That's why MontaVista's kernel preemption patch uses sleeping mutex
 > locks instead of spinlocks for the long held locks.

Anyone who uses sleeping mutex locks is asking for trouble.  Priority
inversion is an issue I dearly hope we never have to deal with in the
Linux kernel, and sleeping SMP mutex locks lead to exactly this kind
of problem.

Later,
David S. Miller
[EMAIL PROTECTED]

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