LDD3中scull在新内核上编译中的各种error处理

叁歲伎倆 2022-09-21 05:33 115阅读 0赞

LDD3中的第一个例程就是scull，但是在新内核上编译的过程那叫一个坎坷。。。  
在此做出总结，希望可以帮到同路人。。。

一、错误：

> error: linux/config.h: No such file or directory

解决：  
从linux-2.6.20起，config.h就已经被移除了.  
在main.c中，  
将`#include <linux/config.h>`  
改为：

#include <linux/version.h>
    #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
            #include <linux/config.h>
    #endif

二、错误：

> /ldd3\_examples/scull/main.c:32:46: fatal error: asm/system.h: No such file or directory

解决：  
在main.c中，  
将`#include <asm/system.h> /* cli(), *_flags */`  
改为:

#if LINUX_VERSION_CODE > KERNEL_VERSION(3,3,0)
            #include <asm/switch_to.h>
    #else
            #include <asm/system.h> /* cli(), *_flags */
    #endif

在目录:/usr/src/linux-headers-3.11.0-15/include下没有asm，只有asm-generic，执行`ln -s asm-generic asm`可以解决。

三、错误：

> error: implicit declaration of function ‘init\_MUTEX’ \[-Werror=implicit-function-declaration\]

解决：  
在新版本的linux内核中，init\_mutex已经被废除了，新版本使用sema\_init函数。需要在main.c中包含头文件`#include<linux/semaphore.h>`

将`init_MUTEX(&scull_devices[i].sem);`  
改为：`sema_init(&scull_devices[i].sem,1);`

四、错误：

error: unknown field ‘ioctl’ specified in initializer

解决：

> 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。

五、错误：  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c: In function ‘scull\_p\_read’:  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c:131:7: error: ‘TASK\_INTERRUPTIBLE’ undeclared (first use in this function)  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c:131:7: note: each undeclared identifier is reported only once for each function it appears in  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c:131:3: error: implicit declaration of function ‘signal\_pending’ \[-Werror=implicit-function-declaration\]  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c:131:3: error: implicit declaration of function ‘schedule’ \[-Werror=implicit-function-declaration\]  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c: In function ‘scull\_getwritespace’:  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c:168:38: error: ‘TASK\_INTERRUPTIBLE’ undeclared (first use in this function)  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c: In function ‘scull\_p\_write’:  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c:219:2: error: ‘TASK\_INTERRUPTIBLE’ undeclared (first use in this function)  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c:223:34: error: ‘SIGIO’ undeclared (first use in this function)  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c:223:41: error: ‘POLL\_IN’ undeclared (first use in this function)

解决：  
头文件变动原因，在pipe.c中添加

#include <linux/sched.h>

六、错误：  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c:321:2: error: unknown field ‘ioctl’ specified in initializer  
解决：  
在pipe.c中，  
将`.ioctl = scull_ioctl,`  
改为`.unlocked_ioctl = scull_ioctl,`

七、错误：  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c: In function ‘scull\_p\_init’:  
/home/jassion/work/book/ldd3\_examples/scull/pipe.c:367:3: error: implicit declaration of function ‘init\_MUTEX’ \[-Werror=implicit-function-declaration\]

解决：  
在pipe.c中，  
将`init_MUTEX(&scull_p_devices[i].sem);`  
改为：`sema_init(&scull_p_devices[i].sem,1);`

八、错误：  
access.c中的一系列错误  
1、/home/jassion/work/book/ldd3\_examples/scull/access.c:98:34: error: ‘SPIN\_LOCK\_UNLOCKED’ undeclared here (not in a function)

解决：原因，SPIN\_LOCK\_UNLOCKED在新内核中被弃用  
在access.c中添加头文件：

#include <linux/spinlock_types.h>

修改定义  
`static spinlock_t scull_u_lock = SPIN_LOCK_UNLOCKED;`  
为：`static DEFINE_SPINLOCK(scull_u_lock);`

2、/home/jassion/work/book/ldd3\_examples/scull/access.c:179:3: error: implicit declaration of function ‘signal\_pending’ \[-Werror=implicit-function-declaration\]  
/home/jassion/work/book/ldd3\_examples/scull/access.c:179:3: error: implicit declaration of function ‘schedule’ \[-Werror=implicit-function-declaration\]。。。。。。。

解决：  
在access.c中添加头文件：

#include <linux/sched.h>

3、/home/jassion/work/book/ldd3\_examples/scull/access.c: In function ‘scull\_u\_open’:  
/home/jassion/work/book/ldd3\_examples/scull/access.c:108:29: error: ‘struct task\_struct’ has no member named ‘uid’  
/home/jassion/work/book/ldd3\_examples/scull/access.c:109:29: error: ‘struct task\_struct’ has no member named ‘euid’  
/home/jassion/work/book/ldd3\_examples/scull/access.c:116:26: error: ‘struct task\_struct’ has no member named ‘uid’  
。。。。。。

解决：原因：新的struct task\_struct 定义有变化，uid和euid在cred结构体中。  
办法：加头文件`#include <linux/cred.h>`，  
将 current->uid改为current->cred->uid，  
current->euid改为current->cred->euid

其他的问题，参考上面的方法进行处理即可。

编译成功之后的截图：  
![这里写图片描述][20160615214439172]

[20160615214439172]: /images/20220721/9b03bf702cd0415a8fe2864ee0c08f8a.png