locking/atomic, arch/h8300: Implement atomic_fetch_{add,sub,and,or,xor}()

Implement FETCH-OP atomic primitives, these are very similar to the
existing OP-RETURN primitives we already have, except they return the
value of the atomic variable _before_ modification.

This is especially useful for irreversible operations -- such as
bitops (because it becomes impossible to reconstruct the state prior
to modification).

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: uclinux-h8-devel@lists.sourceforge.jp
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/h8300/include/asm/atomic.h b/arch/h8300/include/asm/atomic.h
index 4435a44..0961b61 100644 (file)
--- a/arch/h8300/include/asm/atomic.h
+++ b/arch/h8300/include/asm/atomic.h
@@ -28,6 +28,19 @@ static inline int atomic_##op##_return(int i, atomic_t *v)   \
        return ret;                                             \
 }
 
+#define ATOMIC_FETCH_OP(op, c_op)                              \
+static inline int atomic_fetch_##op(int i, atomic_t *v)                \
+{                                                              \
+       h8300flags flags;                                       \
+       int ret;                                                \
+                                                               \
+       flags = arch_local_irq_save();                          \
+       ret = v->counter;                                       \
+       v->counter c_op i;                                      \
+       arch_local_irq_restore(flags);                          \
+       return ret;                                             \
+}
+
 #define ATOMIC_OP(op, c_op)                                    \
 static inline void atomic_##op(int i, atomic_t *v)             \
 {                                                              \
@@ -41,17 +54,23 @@ static inline void atomic_##op(int i, atomic_t *v)          \
 ATOMIC_OP_RETURN(add, +=)
 ATOMIC_OP_RETURN(sub, -=)
 
-ATOMIC_OP(and, &=)
-ATOMIC_OP(or,  |=)
-ATOMIC_OP(xor, ^=)
+#define atomic_fetch_or atomic_fetch_or
 
+#define ATOMIC_OPS(op, c_op)                                   \
+       ATOMIC_OP(op, c_op)                                     \
+       ATOMIC_FETCH_OP(op, c_op)
+
+ATOMIC_OPS(and, &=)
+ATOMIC_OPS(or,  |=)
+ATOMIC_OPS(xor, ^=)
+ATOMIC_OPS(add, +=)
+ATOMIC_OPS(sub, -=)
+
+#undef ATOMIC_OPS
 #undef ATOMIC_OP_RETURN
 #undef ATOMIC_OP
 
-#define atomic_add(i, v)               (void)atomic_add_return(i, v)
 #define atomic_add_negative(a, v)      (atomic_add_return((a), (v)) < 0)
-
-#define atomic_sub(i, v)               (void)atomic_sub_return(i, v)
 #define atomic_sub_and_test(i, v)      (atomic_sub_return(i, v) == 0)
 
 #define atomic_inc_return(v)           atomic_add_return(1, v)