/*optional features*/
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0))
#define CAN_ENABLE_KERN_FASYNC
/*optional features*/
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0))
#define CAN_ENABLE_KERN_FASYNC
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0))
#include <linux/malloc.h>
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0))
#include <linux/malloc.h>