tracing: Use seq file for trace_options
Code simplification for reading trace_options. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> Acked-by: NSteven Rostedt <rostedt@goodmis.org> LKML-reference: <4B1DC4EF.3090106@cn.fujitsu.com> Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
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