From 6adc13f8c096736957444ffa2aa11421b5671aef Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
Date: Mon, 9 Feb 2015 16:32:19 -0500
Subject: [PATCH] tracing: Add TRACE_EVENT_FN example

If a function should be called before a tracepoint is enabled
and/or after it is disabled, the TRACE_EVENT_FN() serves this
purpose. But it is not well documented. Having it as a sample would
help developers to know how to use it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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