Add/update some comments/function headers and fix up some messages.
Reviewed-by: NRick Lindsley <ricklind@linux.vnet.ibm.com>
Reviewed-by: NDany Madden <drt@linux.ibm.com>
Signed-off-by: NSukadev Bhattiprolu <sukadev@linux.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>