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zones, and do it by direct comparison of uma_zone_t instead of strcmp. The mbuf subsystem used to provide M_TRYWAIT/M_DONTWAIT semantics, but this is mostly no longer the case. M_WAITOK has taken over the spot M_TRYWAIT used to have, and for mbuf things, still may return NULL if the code path is incorrectly holding a mutex going into mbuf allocation functions. The M_WAITOK/M_NOWAIT semantics are absolute; though it may deadlock the system to try to malloc or uma_zalloc something with a mutex held and M_WAITOK specified, it is absolutely required to not return NULL and will result in instability and/or security breaches otherwise. There is still room to add the WITNESS_WARN() to all cases so that we are notified of the possibility of deadlocks, but it cannot change the value of the "badness" variable and allow allocation to actually fail except for the specialized cases which used to be M_TRYWAIT.
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