Hexagon: fix atomic_set

Normal writes in our our architecture don't invalidate lock reservations. Signed-off-by: Richard Kuo <[email protected]>
rtvt123 · Apr 4, 2014 · b10fa7b · b10fa7b
1 parent 17ca896
commit b10fa7b
Showing 1 changed file with 14 additions and 1 deletion.
diff --git a/arch/hexagon/include/asm/atomic.h b/arch/hexagon/include/asm/atomic.h
@@ -26,7 +26,20 @@
 #include <asm/cmpxchg.h>
 
 #define ATOMIC_INIT(i)		{ (i) }
-#define atomic_set(v, i)	((v)->counter = (i))
+
+/*  Normal writes in our arch don't clear lock reservations  */
+
+static inline void atomic_set(atomic_t *v, int new)
+{
+	asm volatile(
+		"1:	r6 = memw_locked(%0);\n"
+		"	memw_locked(%0,p0) = %1;\n"
+		"	if (!P0) jump 1b;\n"
+		:
+		: "r" (&v->counter), "r" (new)
+		: "memory", "p0", "r6"
+	);
+}
 
 /**
  * atomic_read - reads a word, atomically