Well if there is only one memory location involved, then smp_rmb()
isn't
going to really do anything anyway, so it would be incorrect to use
it.
rmb() orders *any* two reads; that includes two reads from the same
location.
If the two reads are to the same location, all CPUs I am aware of
will maintain the ordering without need for a memory barrier.
That's true of course, although there is no real guarantee for that.
Segher
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