[NET]: rtnetlink -- ASSERT_RTNL and BUG_TRAP.

Change ASSERT_RTNL and BUG_TRAP
- unlikely to occur
- tag message as error
- dump_stack in ASSERT_RTNL to aide finding code path
- make all format's which a smart compiler can optimize

include/linux/rtnetlink.h

@@ -683,11 +683,21 @@ extern void rtnl_lock(void);
 extern void rtnl_unlock(void);
 extern void rtnetlink_init(void);
 
-#define ASSERT_RTNL() do { if (down_trylock(&rtnl_sem) == 0)  { up(&rtnl_sem); \
-printk("RTNL: assertion failed at " __FILE__ "(%d)\n", __LINE__); } \
-		   } while(0)
-#define BUG_TRAP(x) if (!(x)) { printk("KERNEL: assertion (" #x ") failed at " __FILE__ "(%d)\n", __LINE__); }
-
+#define ASSERT_RTNL() do { \
+	if (unlikely(down_trylock(&rtnl_sem) == 0)) { \
+		up(&rtnl_sem); \
+		printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
+		       __FILE__,  __LINE__); \
+		dump_stack(); \
+	} \
+} while(0)
+
+#define BUG_TRAP(x) do { \
+	if (unlikely(!(x))) { \
+		printk(KERN_ERR "KERNEL: assertion (%s) failed at %s (%d)\n", \
+			#x,  __FILE__ , __LINE__); \
+	} \
+} while(0)
 
 #endif /* __KERNEL__ */