what is trace_sched_kthread_stop_ret used for?

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Dear all:
i saw there is a function called "trace_sched_kthread_stop_ret" in
some place of kernel.
but I found it is empty function.
http://lxr.linux.no/linux+v3.1.5/+code=trace_sched_kthread_stop_ret

if it is empty, why we still keep it in kernel?

-- 
Regards,

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