tracing/events: add support for modules to TRACE_EVENT

Impact: allow modules to add TRACE_EVENTS on load

This patch adds the final hooks to allow modules to use the TRACE_EVENT
macro. A notifier and a data structure are used to link the TRACE_EVENTs
defined in the module to connect them with the ftrace event tracing system.

It also adds the necessary automated clean ups to the trace events when a
module is removed.

Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 955b967acd74..60c5323bee64 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -477,6 +477,7 @@ __attribute__((__aligned__(4)))						\
 __attribute__((section("_ftrace_events"))) event_##call = {             \
         .name                   = #call,                                \
         .system                 = __stringify(TRACE_SYSTEM),            \
+        .event                  = &ftrace_event_type_##call,            \
         .raw_init               = ftrace_raw_init_event_##call,         \
         .regfunc                = ftrace_raw_reg_event_##call,          \
         .unregfunc              = ftrace_raw_unreg_event_##call,        \