[SPARC]: Emulate cmpxchg like parisc
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Kyle McMartin <kyle@parisc-linux.org> Signed-off-by: David S. Miller <davem@davemloft.net>