I expect the answer is that we need to dig out the old one.
Previously I don't think the full cmpxchg semantics werere required unless the
box is smp -- there's no case where atomic operations are required for
hardware interaction, for example. ...
Probably this changed with preempt, though, so we need one even on UP boxes...
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This archive was generated by hypermail 2b29 : Fri May 31 2002 - 22:00:21 EST