How would one unmount a kernfs?

I noticed that I accidentally mounted kernfs multiple times!  It doesn't 
seem to cause any problems but to be on the safe side, how do I unmount? 

Thanks..

--
 o/ \o/  o  <o   o  o   o    She walks in  beauty, like the night
<|   |  /|\  |> <|><|> <|\       Of cloudless climes and starry skies;
/|  / \  /| / \ //  \\ / \   And all that's best of dark and bright
""""""""""""""""""""""""""""     Meet in her aspect and her eyes.  (Byron)