Mark __tp_cb_data as possibly unused for backward compat API

Thanks to Lluís Vilanova for proposing this.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/include/ust/tracepoint.h b/include/ust/tracepoint.h
index 9463e4072fa6411d054a2c0f74bd7f6b3f9631f2..5e7f9d86967580fd314ca1b21621e678ff585f85 100644 (file)
--- a/include/ust/tracepoint.h
+++ b/include/ust/tracepoint.h
@@ -70,12 +70,13 @@ struct tracepoint {
 /*
  * it_func[0] is never NULL because there is at least one element in the array
  * when the array itself is non NULL.
+ * __attribute__((unused)) is for backward compatibility API.
  */
 #define __DO_TRACE(tp, proto, args)                                    \
        do {                                                            \
                struct tracepoint_probe *__tp_it_probe_ptr;             \
                void *__tp_it_func;                                     \
-               void *__tp_cb_data;                                     \
+               void *__tp_cb_data __attribute__((unused));             \
                                                                        \
                rcu_read_lock();                                        \
                __tp_it_probe_ptr = rcu_dereference((tp)->probes);      \