error: unknown field 'ioctl' specified in initializer

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。

error: unknown field 'ioctl' specified in initializer问题是由于2.6.36内核之后 去掉了原来的ioctl，添加两个新的成员，所以会出错

long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);

 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);

 所以修改源文件中file_operations内.ioctl 改为 .compat_ioctl 即可

OK，编译通过，警告咱就忽略了