why does switch_to need three arguments?

["Bao zhao" <paozhaokeats@xxxxxxxxxxx>]

In 2.6.0 kernel,

context_switch function is the only one which calls switch_to, and the first 
argument and the third argument are same. Is it not redundant?

static inline task_t * context_switch(runqueue_t *rq, task_t *prev, task_t 
*next)
{
....
switch_to(prev, next, prev);
             ....
}

Thanks in advance !

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