> was that it basically said "an interrupt or another processor might
> have changed memory, so don't keep values from memory cached in
> registers".  With wmb() on SMP, this seems to be extended to include
> "make sure other cpus can see the values we just wrote".  I don't know
> exactly how rmb() differs from mb().

	rmb()	Do not re-order reads across this point (CPU or compiler)
	wmb() 	Do not re-order writes across this point (CPU or compiler)
	mb()	Do not re-order reads or write across this point


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