LDD3中scull在新内核上编译中的各种error处理

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：