tile: support atomic64_dec_if_positive()
Use the normal cmpxchg() idiom to implement this functionality.
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
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Use the normal cmpxchg() idiom to implement this functionality.
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>