From: Jason Baron <jbaron@redhat.com>
Date: Thu, 26 Mar 2009 22:10:53 -0400
Subject: [trace] use unregister return value
Message-id: 200903270210.n2R2ArfO030449@ns3.rdu.redhat.com
O-Subject: [RHEL 5.4 PATCH 10/10] -tracepoints: use unregister return value
Bugzilla: 465543

make sure we have proper return values on a tracepoint unregister.

taken from upstream committ: c420970ef476d7d68df119711700666224001f43

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index c11451d..71ec6c9 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -72,9 +72,9 @@ struct tracepoint {
 	{								\
 		return tracepoint_probe_register(#name, (void *)probe); \
 	}								\
-	static inline void unregister_trace_##name(void (*probe)(proto))\
+	static inline int unregister_trace_##name(void (*probe)(proto))\
 	{								\
-		tracepoint_probe_unregister(#name, (void *)probe);      \
+		return tracepoint_probe_unregister(#name, (void *)probe);      \
 	}
 
 extern void tracepoint_update_probe_range(struct tracepoint *begin,
@@ -90,8 +90,10 @@ extern void tracepoint_update_probe_range(struct tracepoint *begin,
 	{								\
 		return -ENOSYS;						\
 	}								\
-	static inline void unregister_trace_##name(void (*probe)(proto))\
-	{ }
+	static inline int unregister_trace_##name(void (*probe)(proto))	\
+	{								\
+		return -ENOSYS;						\
+	}
 
 static inline void tracepoint_update_probe_range(struct tracepoint *begin,
 	struct tracepoint *end)