1. 根目录:
2. drivers
3. staging
4. iio
5. kfifo_buf.h

#include <linux/kfifo.h>
#include "iio.h"
#include "ring_generic.h"

struct iio_kfifo {
	struct iio_ring_buffer ring;
	struct kfifo kf;
	int use_count;
	int update_needed;
	struct mutex use_lock;
};

extern const struct iio_ring_access_funcs kfifo_access_funcs;

struct iio_ring_buffer *iio_kfifo_allocate(struct iio_dev *indio_dev);
void iio_kfifo_free(struct iio_ring_buffer *r);