drivers/char/random.c exported interfaces

It says in the comments in drivers/char/random.c that:

  * Exported interfaces ---- input
  * ==============================
  *
  * The current exported interfaces for gathering environmental noise
  * from the devices are:
  *
  * 	void add_input_randomness(unsigned int type, unsigned int code,
  *                                unsigned int value);
  * 	void add_interrupt_randomness(int irq);
  *
  * add_input_randomness() uses the input layer interrupt timing, as well as
  * the event type information from the hardware.
  *
[..snip..]

If "add_input_randomness" is an "Exported interface" why is it not an
exported symbol?

If I build drivers/input/input.ko, I get the error:

** Warning: "add_input_randomness" [drivers/input/input.ko] undefined!

?

Thanks
-Robin
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