1.ioctl 與 unlocked_ioctl   / int 與long

舊版本：

static const struct file_operations globalmem_fops=
{
.owner=THIS_MODULE,
.llseek=globalmem_llseek,
.open=globalmem_open,
.read=globalmem_read,
.write=globalmem_write,
.ioctl=globalmem_ioctl,
.release=globalmem_release,
};

int globalmem_ioctl(struct inode* inode,struct file* filp, unsigned int cmd,unsigned long arg)

{

switch (cmd)

  {

   case:XXX:   ...

    ……

  }

}

新版本：

static const struct file_operations globalmem_fops=
{
.owner=THIS_MODULE,
.llseek=globalmem_llseek,
.open=globalmem_open,
.read=globalmem_read,
.write=globalmem_write,
.unlocked_ioctl=globalmem_ioctl,
.release=globalmem_release,
};

long globalmem_ioctl(struct file* filp, unsigned int cmd,unsigned long arg)//沒有inode參數(shù),！

{

switch (cmd)

  {

   case:XXX:   ...

    ……

  }

}

2.class_create/device_create 與 devfs_mk_cdev

舊版本：devfs_mk_cdev(MKDEV(LED_MAJOR, 0), S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,DEVICE_NAME);  

新版本：

/*******     功能：內(nèi)核驅(qū)動(dòng)注冊(cè)完后,，用以下代碼創(chuàng)建設(shè)備文件  ******/

mydriver_class = class_create(THIS_MODULE, DEVICE_NAME); //注冊(cè)一個(gè)類，使mdev可以在"/dev/"目錄下 面建立設(shè)備節(jié)點(diǎn)

//創(chuàng)建一個(gè)設(shè)備節(jié)點(diǎn),，節(jié)點(diǎn)名為DEVICE_NAME

device_create(mydriver_class, NULL, devno, NULL, DEVICE_NAME);