+extern struct semaphore rtnl_sem;
+
+#define rtnl_shlock() down(&rtnl_sem)
+#define rtnl_shlock_nowait() down_trylock(&rtnl_sem)
+
+#define rtnl_shunlock() do { up(&rtnl_sem); \
+ if (rtnl && rtnl->sk_receive_queue.qlen) \
+ rtnl->sk_data_ready(rtnl, 0); \
+ } while(0)
+