David S. Miller c7fed9d750 [SPARC64]: Fix futex_atomic_cmpxchg_inatomic implementation.
I copied the logic from ll/sc arch implementations, but that
was wrong and makes no sense at all.  Just do a straight
compare-exchange instruction, just like x86.

Based upon bug reports from Dennis Gilmore and Fabio Massimo.

Signed-off-by: David S. Miller <davem@davemloft.net>
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