arch,sparc: Convert smp_mb__*()

sparc32: fully relies on asm-generic/barrier.h and thus can use its
	 implementation.

sparc64: is strongly ordered and its atomic ops imply a full barrier,
	 implement the new primitives using barrier().

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Link: http://lkml.kernel.org/n/tip-2cla9ubpd8chrntnm7e4zdt4@git.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-kernel@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/sparc/include/asm/atomic_32.h

@@ -14,6 +14,7 @@
 #include <linux/types.h>
 
 #include <asm/cmpxchg.h>
+#include <asm/barrier.h>
 #include <asm-generic/atomic64.h>
 
 
@@ -52,10 +53,4 @@ extern void atomic_set(atomic_t *, int);
 #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
 #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
 
-/* Atomic operations are already serializing */
-#define smp_mb__before_atomic_dec()	barrier()
-#define smp_mb__after_atomic_dec()	barrier()
-#define smp_mb__before_atomic_inc()	barrier()
-#define smp_mb__after_atomic_inc()	barrier()
-
 #endif /* !(__ARCH_SPARC_ATOMIC__) */

arch/sparc/include/asm/atomic_64.h

@@ -9,6 +9,7 @@
 
 #include <linux/types.h>
 #include <asm/cmpxchg.h>
+#include <asm/barrier.h>
 
 #define ATOMIC_INIT(i)		{ (i) }
 #define ATOMIC64_INIT(i)	{ (i) }
@@ -108,10 +109,4 @@ static inline long atomic64_add_unless(atomic64_t *v, long a, long u)
 
 extern long atomic64_dec_if_positive(atomic64_t *v);
 
-/* Atomic operations are already serializing */
-#define smp_mb__before_atomic_dec()	barrier()
-#define smp_mb__after_atomic_dec()	barrier()
-#define smp_mb__before_atomic_inc()	barrier()
-#define smp_mb__after_atomic_inc()	barrier()
-
 #endif /* !(__ARCH_SPARC64_ATOMIC__) */

arch/sparc/include/asm/barrier_64.h

@@ -68,4 +68,7 @@ do {									\
 	___p1;								\
 })
 
+#define smp_mb__before_atomic()	barrier()
+#define smp_mb__after_atomic()	barrier()
+
 #endif /* !(__SPARC64_BARRIER_H) */

arch/sparc/include/asm/bitops_32.h

@@ -90,9 +90,6 @@ static inline void change_bit(unsigned long nr, volatile unsigned long *addr)
 
 #include <asm-generic/bitops/non-atomic.h>
 
-#define smp_mb__before_clear_bit()	do { } while(0)
-#define smp_mb__after_clear_bit()	do { } while(0)
-
 #include <asm-generic/bitops/ffz.h>
 #include <asm-generic/bitops/__ffs.h>
 #include <asm-generic/bitops/sched.h>

arch/sparc/include/asm/bitops_64.h

@@ -13,6 +13,7 @@
 
 #include <linux/compiler.h>
 #include <asm/byteorder.h>
+#include <asm/barrier.h>
 
 extern int test_and_set_bit(unsigned long nr, volatile unsigned long *addr);
 extern int test_and_clear_bit(unsigned long nr, volatile unsigned long *addr);
@@ -23,9 +24,6 @@ extern void change_bit(unsigned long nr, volatile unsigned long *addr);
 
 #include <asm-generic/bitops/non-atomic.h>
 
-#define smp_mb__before_clear_bit()	barrier()
-#define smp_mb__after_clear_bit()	barrier()
-
 #include <asm-generic/bitops/fls.h>
 #include <asm-generic/bitops/__fls.h>
 #include <asm-generic/bitops/fls64.h>