runque status

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hi all,
this is regarding kernel ver 2.2.14. the function
wake_up_process is for making a process runnable.
however it checks whether the process was already in
the runqueue  by checking the next_run pointer of the
process descriptor. is it possible for a process to be
in runqueue prior to the function being invoked. if
yes, could someone plz tell me how is it. 
regards
sumit

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