Man page 9 : kfifo_alloc

kfifo_alloc - dynamically allocates a new fifo buffer

kfifo_alloc( fifo , size , gfp_mask );

fifo
    pointer to the fifo

size
    the number of elements in the fifo, this must be a power of 2

gfp_mask
    get_free_pages mask, passed to kmalloc

This macro dynamically allocates a new fifo buffer.

The numer of elements will be rounded-up to a power of 2. The fifo will be release with kfifo_free. Return 0 if no error, otherwise an error code.