KFIFO_SIZE
DEFINE_KFIFO(my_fifo, u8, KFIFO_SIZE);
DECLARE_KFIFO(my_fifo, u8, KFIFO_SIZE);
DECLARE_KFIFO(my_fifo1, u8, KFIFO_SIZE);
DEFINE_KFIFO(my_fifo2, u8, KFIFO_SIZE);
DEFINE_KFIFO(my_fifo, u8, KFIFO_SIZE);
ret = kfifo_alloc(&my_fifo, KFIFO_SIZE, GFP_KERNEL);
DEFINE_KFIFO(my_fifo, u8, KFIFO_SIZE);
DEFINE_KFIFO(my_fifo, u8, KFIFO_SIZE);
DEFINE_KFIFO(my_fifo, u8, KFIFO_SIZE);
DEFINE_KFIFO(my_fifo, u8, KFIFO_SIZE);
DEFINE_KFIFO(my_fifo, u8, KFIFO_SIZE);