Man page 9 : kfifo_peek

kfifo_peek - get data from the fifo without removing

kfifo_peek( fifo , val );

fifo
    address of the fifo to be used

val
    the var where to store the data to be added

This reads the data from the fifo without removing it from the fifo. It returns 0 if the fifo was empty. Otherwise it returns the number processed elements.

Note that with only one concurrent reader and one concurrent writer, you donAqt need extra locking to use these macro.