-#define _rcu_cmpxchg_pointer(p, old, _new) \
- ({ \
- if (!__builtin_constant_p(_new) || \
- ((_new) != NULL)) \
- wmb(); \
- uatomic_cmpxchg(p, old, _new); \
+#define _rcu_cmpxchg_pointer(p, old, _new) \
+ ({ \
+ typeof(*p) _________pold = (old); \
+ typeof(*p) _________pnew = (_new); \
+ if (!__builtin_constant_p(_new) || \
+ ((_new) != NULL)) \
+ cmm_wmb(); \
+ uatomic_cmpxchg(p, _________pold, _________pnew); \