arm_drain_writebuf - drains the cpu write buffer
arm_drain_writebuf() will make sure that all the entries in the processor
write buffer are written out to memory.
Not all processors support this operation (currently only the SA110).
Those processes that do not treat this function as a null-op.
arm_drain_writebuf() will never fail so will always return 0.
StrongARM Data Sheet
BSD March 29, 2002 BSD
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