Commit 8bcd0663 authored by Steven Rostedt (Google)'s avatar Steven Rostedt (Google)
Browse files

tracing: Allow custom events to be added to the tracefs directory 

Allow custom events to be added to the events directory in the tracefs
file system. For example, a module could be installed that attaches to an
event and wants to be enabled and disabled via the tracefs file system. It
would use trace_add_event_call() to add the event to the tracefs
directory, and trace_remove_event_call() to remove it.

Make both those functions EXPORT_SYMBOL_GPL().

Link: https://lkml.kernel.org/r/20220303220625.186988045@goodmis.org



Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent 5677a3d7

kernel/trace/trace_events.c

+2 −0
Original line number Diff line number Diff line
@@ -2758,6 +2758,7 @@ int trace_add_event_call(struct trace_event_call *call) 
	mutex_unlock(&trace_types_lock);

	return ret;

}

EXPORT_SYMBOL_GPL(trace_add_event_call);



/*

 * Must be called under locking of trace_types_lock, event_mutex and
@@ -2819,6 +2820,7 @@ int trace_remove_event_call(struct trace_event_call *call) 


	return ret;

}

EXPORT_SYMBOL_GPL(trace_remove_event_call);



#define for_each_event(event, start, end)			\

	for (event = start;					\