Add __rcu annotation to :
	(struct tracepoint)->funcs
Acked-by: NMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: NLai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <4D22D4F1.50505@cn.fujitsu.com>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>