tracing: Use seq file for trace_clock
The buffer for the output is as small as 64 bytes, so it'll overflow if we add more clock type. Use seq file instead. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> Acked-by: NSteven Rostedt <rostedt@goodmis.org> LKML-Reference: <4B1DC4FB.5030407@cn.fujitsu.com> Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
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