Synchronization [was Re: The Magic Show: kernel_map() disappearing]

[Cort Dougan]

Then my paranoid use of sync can go away, and we can stick with eieio as
long as we have the "memory" marked changed in the linline asm.  Sound
good to everyone?

}	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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