eieio: prevent CPU from reordering/collapsing reads/writes to memory.
        (but otherwise run at full steam!)

Thats what mb() does - its a memory-barrier hence the name - it imposes
strong store ordering properties across it. 

That's why I added the iobarrier() macros (adding _w/_r/_rw on Alan's
request) that are only related to IO synchronization within the same
CPU. Essentially it's just renaming the eieio() macro already used in
many PPC drivers because it's a bad name; Linux/APUS will be sharing
drivers with Linux/m68k where eieio isn't such a helpful name.

Yep.

x86 and most other processors dont have the notion of a store barrier and
an i/o barrier beign different

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