#define rmb() mb ()
#define wmb() mb ()
#define read_barrier_depends() ((void)0)
-#define set_rmb(var, value) do { xchg (&var, value); } while (0)
-#define set_mb(var, value) set_rmb (var, value)
+#define set_mb(var, value) do { xchg (&var, value); } while (0)
#define smp_mb() mb ()
#define smp_rmb() rmb ()
#define xchg(ptr, with) \
((__typeof__ (*(ptr)))__xchg ((unsigned long)(with), (ptr), sizeof (*(ptr))))
-#define tas(ptr) (xchg ((ptr), 1))
static inline unsigned long __xchg (unsigned long with,
__volatile__ void *ptr, int size)