locking,arch,cris: Fold atomic_ops

Many of the atomic op implementations are the same except for one
instruction; fold the lot into a few CPP macros and reduce LoC.

This also prepares for easy addition of new ops.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: linux-cris-kernel@axis.com
Link: http://lkml.kernel.org/r/20140508135852.104572724@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/cris/include/asm/atomic.h

@@ -22,43 +22,36 @@
 
 /* These should be written in asm but we do it in C for now. */
 
-static inline void atomic_add(int i, volatile atomic_t *v)
-{
-	unsigned long flags;
-	cris_atomic_save(v, flags);
-	v->counter += i;
-	cris_atomic_restore(v, flags);
+#define ATOMIC_OP(op, c_op)						\
+static inline void atomic_##op(int i, volatile atomic_t *v)		\
+{									\
+	unsigned long flags;						\
+	cris_atomic_save(v, flags);					\
+	v->counter c_op i;						\
+	cris_atomic_restore(v, flags);					\
+}									\
+
+#define ATOMIC_OP_RETURN(op, c_op)					\
+static inline int atomic_##op##_return(int i, volatile atomic_t *v)	\
+{									\
+	unsigned long flags;						\
+	int retval;							\
+	cris_atomic_save(v, flags);					\
+	retval = (v->counter c_op i);					\
+	cris_atomic_restore(v, flags);					\
+	return retval;							\
 }
 
-static inline void atomic_sub(int i, volatile atomic_t *v)
-{
-	unsigned long flags;
-	cris_atomic_save(v, flags);
-	v->counter -= i;
-	cris_atomic_restore(v, flags);
-}
+#define ATOMIC_OPS(op, c_op) ATOMIC_OP(op, c_op) ATOMIC_OP_RETURN(op, c_op)
 
-static inline int atomic_add_return(int i, volatile atomic_t *v)
-{
-	unsigned long flags;
-	int retval;
-	cris_atomic_save(v, flags);
-	retval = (v->counter += i);
-	cris_atomic_restore(v, flags);
-	return retval;
-}
+ATOMIC_OPS(add, +=)
+ATOMIC_OPS(sub, -=)
 
-#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
+#undef ATOMIC_OPS
+#undef ATOMIC_OP_RETURN
+#undef ATOMIC_OP
 
-static inline int atomic_sub_return(int i, volatile atomic_t *v)
-{
-	unsigned long flags;
-	int retval;
-	cris_atomic_save(v, flags);
-	retval = (v->counter -= i);
-	cris_atomic_restore(v, flags);
-	return retval;
-}
+#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
 
 static inline int atomic_sub_and_test(int i, volatile atomic_t *v)
 {