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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: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Google) 2022-03-03 17:05:31 -05:00
parent 5677a3d713
commit 8bcd06632b
1 changed files with 2 additions and 0 deletions
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2
kernel/trace/trace_events.c
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@ -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; \