Redefine `mmiowb' in terms of `iobarrier_w' so that it works correctly
for MIPS I platforms, which have no SYNC machine instruction and use a
call to `wbflush' instead.
This doesn't change the semantics for CONFIG_CPU_CAVIUM_OCTEON, because
`iobarrier_w' expands to `wmb', which is ultimately
Redefine `mmiowb' in terms of `iobarrier_w' so that it works correctly
for MIPS I platforms, which have no SYNC machine instruction and use a
call to `wbflush' instead.
This doesn't change the semantics for CONFIG_CPU_CAVIUM_OCTEON, because
`iobarrier_w' expands to `wmb', which is ultimately
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