lttng instrumentation: tracepoint events

Modifications to the in-kernel TRACE_EVENT are needed to generate the
compact event descriptions and the probe code LTTng generates. These
changes could apply to upstream TRACE_EVENT, but requires changing the
in-kernel API.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/lttng/instrumentation/events/README

@@ -0,0 +1,7 @@
+The workflow for updating patches from newer kernel:
+
+Diff mainline/ and lttng-module/ directories.
+
+Pull the new headers from mainline kernel to mainline/.
+Copy them into lttng-modules.
+Apply diff. Fix conflicts.