locking/atomic, arch/mn10300: 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: David Howells <dhowells@redhat.com>
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: linux-am33-list@redhat.com
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/mn10300/include/asm/atomic.h b/arch/mn10300/include/asm/atomic.h
index ce318d5..3580f78 100644 (file)
--- a/arch/mn10300/include/asm/atomic.h
+++ b/arch/mn10300/include/asm/atomic.h
@@ -84,16 +84,43 @@ static inline int atomic_##op##_return(int i, atomic_t *v)          \
        return retval;                                                  \
 }
 
-#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op)
+#define ATOMIC_FETCH_OP(op)                                            \
+static inline int atomic_fetch_##op(int i, atomic_t *v)                        \
+{                                                                      \
+       int retval, status;                                             \
+                                                                       \
+       asm volatile(                                                   \
+               "1:     mov     %4,(_AAR,%3)    \n"                     \
+               "       mov     (_ADR,%3),%1    \n"                     \
+               "       mov     %1,%0           \n"                     \
+               "       " #op " %5,%0           \n"                     \
+               "       mov     %0,(_ADR,%3)    \n"                     \
+               "       mov     (_ADR,%3),%0    \n"     /* flush */     \
+               "       mov     (_ASR,%3),%0    \n"                     \
+               "       or      %0,%0           \n"                     \
+               "       bne     1b              \n"                     \
+               : "=&r"(status), "=&r"(retval), "=m"(v->counter)        \
+               : "a"(ATOMIC_OPS_BASE_ADDR), "r"(&v->counter), "r"(i)   \
+               : "memory", "cc");                                      \
+       return retval;                                                  \
+}
+
+#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
 
 ATOMIC_OPS(add)
 ATOMIC_OPS(sub)
 
-ATOMIC_OP(and)
-ATOMIC_OP(or)
-ATOMIC_OP(xor)
+#undef ATOMIC_OPS
+#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
+
+#define atomic_fetch_or atomic_fetch_or
+
+ATOMIC_OPS(and)
+ATOMIC_OPS(or)
+ATOMIC_OPS(xor)
 
 #undef ATOMIC_OPS
+#undef ATOMIC_FETCH_OP
 #undef ATOMIC_OP_RETURN
 #undef ATOMIC_OP