Tracepoints: add noargs support

Add support for tracepoints receiving no argument as parameters. Copied
from Linux kernel:

commit 38516ab59fbc5b3bb278cf5e1fe2867c70cff32e
Author: Steven Rostedt <srostedt@redhat.com>
Date:   Tue Apr 20 17:04:50 2010 -0400

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
CC: Nils Carlson <nils.carlson@ericsson.com>
CC: Steven Rostedt <rostedt@goodmis.org>

diff --git a/include/ust/tracepoint.h b/include/ust/tracepoint.h
index b2e03cd46bfcdbac2b01b59417ebf3ddb80e601c..626f8af545dfea3d9c5136503ad7a61c44fae6ef 100644 (file)
--- a/include/ust/tracepoint.h
+++ b/include/ust/tracepoint.h
@@ -175,10 +175,27 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
 { }
 #endif /* CONFIG_TRACEPOINTS */
 
-#define DECLARE_TRACE(name, proto, args)                       \
-       __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),      \
-                       PARAMS(void *__data, proto),            \
-                       PARAMS(__data, args))
+/*
+ * The need for the DECLARE_TRACE_NOARGS() is to handle the prototype
+ * (void). "void" is a special value in a function prototype and can
+ * not be combined with other arguments. Since the DECLARE_TRACE()
+ * macro adds a data element at the beginning of the prototype,
+ * we need a way to differentiate "(void *data, proto)" from
+ * "(void *data, void)". The second prototype is invalid.
+ *
+ * DECLARE_TRACE_NOARGS() passes "void" as the tracepoint prototype
+ * and "void *__data" as the callback prototype.
+ *
+ * DECLARE_TRACE() passes "proto" as the tracepoint protoype and
+ * "void *__data, proto" as the callback prototype.
+ */
+#define DECLARE_TRACE_NOARGS(name)                                     \
+               __DECLARE_TRACE(name, void, , void *__data, __data)
+
+#define DECLARE_TRACE(name, proto, args)                               \
+               __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),      \
+                               PARAMS(void *__data, proto),            \
+                               PARAMS(__data, args))
 
 /*
  * Connect a probe to a tracepoint.