Man page 9 : kfifo_in_spinlocked

kfifo_in_spinlocked - put data into the fifo using a spinlock for locking

kfifo_in_spinlocked( fifo , buf , n , lock );

fifo
    address of the fifo to be used

buf
    the data to be added

n
    number of elements to be added

lock
    pointer to the spinlock to use for locking

This macro copies the given values buffer into the fifo and returns the number of copied elements.