extern int __atomic_add_return(int, atomic_t *);
extern int atomic_cmpxchg(atomic_t *, int, int);
-#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+extern int atomic_xchg(atomic_t *, int);
extern int __atomic_add_unless(atomic_t *, int, int);
extern void atomic_set(atomic_t *, int);