I have a question for the x86 gurus. We're currently using the lock
prefix for set_64bit. This will lock the bus for the RMW cycle, but
is it a prerequisite for the atomic 64-bit store? Even on UP?

An atomic 64bit store doesn't need a lock prefix. A cmpxchg will
need to though. Note that UP kernels define LOCK to nothing.

-Andi
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