在linux-2.6.36内核上加载编译驱动时，出现
error:unknown field 'ioctl' specified in initializer
原因是：在2.6.36内核上file_operations发生了重大的改变：
原先的
int (*ioctl)(struct inode*, struct file*, unsigned int, unsigned long);
被改为了
long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
因而在实际驱动中，我们需要将原先的写的ioctl函数头给改成下面的unlocked_ioctl，在file_operations结构体的填充中也是一样。
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