arch,alpha: Convert smp_mb__*() to the asm-generic primitives

The Alpha ll/sc primitives do not imply any sort of barrier; therefore
the smp_mb__{before,after} should be a full barrier. This is the
default from asm-generic/barrier.h and therefore just remove the
current definitions.

Signed-off-by: Peter Zijlstra <[e-mail]>
Acked-by: Paul E. McKenney <[e-mail]>
Link: http://lkml.kernel.org/n/[e-mail]
Cc: Ivan Kokshaysky <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Matt Turner <[e-mail]>
Cc: Richard Henderson <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

arch/alpha/include/asm/atomic.h

···
 #define atomic_dec(v) atomic_sub(1,(v))
 #define atomic64_dec(v) atomic64_sub(1,(v))
 
-#define smp_mb__before_atomic_dec()	smp_mb()
-#define smp_mb__after_atomic_dec()	smp_mb()
-#define smp_mb__before_atomic_inc()	smp_mb()
-#define smp_mb__after_atomic_inc()	smp_mb()
-
 #endif /* _ALPHA_ATOMIC_H */

arch/alpha/include/asm/bitops.h

···
 	*m |= 1 << (nr & 31);
 }
 
-#define smp_mb__before_clear_bit()	smp_mb()
-#define smp_mb__after_clear_bit()	smp_mb()
-
 static inline void
 clear_bit(unsigned long nr, volatile void * addr)
 {