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：