linux驱动学习笔记（2.3) scull模块 init_MUTEX被废除

一、今天在编译ldd3上的scullc的时候，出现如下错误：

刚开始我以为没有包含头文件，然后我就去查2.6.39.1的源代码，结果在所有的符号中都没有发现init_MUTEX,后面在网站上发现了init_MUTEX的定义，如下所示：

源码衔接：

http://lxr.oss.org.cn/source/include/asm-i386/semaphore.h#L89

上面的源码是2.6.16以前的，在2.6.25以后就再也找不到这个宏了，原因我目前不清楚，根据定义就已经可以把问题解决了，将代码改成下面的就行了：

二.排出此问题，出现例外一个问题

原因：在2.6.32 linux/fs/ntfs/ChangeLog 看到如下片段

01 672.1.26 - Minor bug fixes and updates.
02  68
03  69        - Fix a potential overflow in file.c where a cast to s64 was missing in
04  70          a left shift of a page index.
05  71        - The struct inode has had its i_sem semaphore changed to a mutex named
06  72          i_mutex.
07 <font style="background-color: #ffff00"> 73        - We have struct kmem_cache now so use it instead of the typedef
08  74          kmem_cache_t.  (Pekka Enberg)</font>
09  75        - Implement support for sector sizes above 512 bytes (up to the maximum
10  76          supported by NTFS which is 4096 bytes).
11  77        - Do more detailed reporting of why we cannot mount read-write by
12  78          special casing the VOLUME_MODIFIED_BY_CHKDSK flag.

解决 修改main.c中的 52 53 54行

1 /* declare one cache pointer: use it for all devices */
2 //kmem_cache_t *scullc_cache;
3 struct kmem_cache *scullc_cache;

三，问题又来了

01 home/allen/share/ldd3/src/scull/pipe.c:131:7: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)
02 /home/allen/share/ldd3/src/scull/pipe.c:131:7: note: each undeclared identifier is reported only once for each function it appears in
03 /home/allen/share/ldd3/src/scull/pipe.c:131:3: error: implicit declaration of function ‘signal_pending’
04 /home/allen/share/ldd3/src/scull/pipe.c:131:3: error: implicit declaration of function ‘schedule’
05 /home/allen/share/ldd3/src/scull/pipe.c: In function ‘scull_getwritespace’:
06 /home/allen/share/ldd3/src/scull/pipe.c:168:38: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)
07 /home/allen/share/ldd3/src/scull/pipe.c: In function ‘scull_p_write’:
08 /home/allen/share/ldd3/src/scull/pipe.c:219:2: error: ‘TASK_INTERRUPTIBLE’ undeclared (first use in this function)
09 /home/allen/share/ldd3/src/scull/pipe.c:223:34: error: ‘SIGIO’ undeclared (first use in this function)
10 /home/allen/share/ldd3/src/scull/pipe.c:223:41: error: ‘POLL_IN’ undeclared (first use in this function)
11 /home/allen/share/ldd3/src/scull/pipe.c: At top level:
12 /home/allen/share/ldd3/src/scull/pipe.c:319:2: error: unknown field ‘ioctl’ specified in initializer
13 /home/allen/share/ldd3/src/scull/pipe.c:319:2: warning: initialization from incompatible pointer type
14 /home/allen/share/ldd3/src/scull/pipe.c: In function ‘scull_p_init’:
15 /home/allen/share/ldd3/src/scull/pipe.c:365:3: error: implicit declaration of function ‘init_MUTEX’
16 make[2]: *** [/home/allen/share/ldd3/src/scull/pipe.o] Error 1
17 make[1]: *** [_module_/home/allen/share/ldd3/src/scull] Error 2

TASK_INTERRUPTIBLE找不到，既然前面删除掉了了一个头文件，必然有很多变量找不到，
那就到/usr/src/linux-headers-2.6.32-22-generic下grep一下呗：
最终找到头文件,添加上：
#include <linux/sched.h>
access.c也需要添加上面的头文件。

 

unknown field ‘ioctl’ specified in initializer

是因为ioctl接口更换的问题。

使用.unlocked_ioctl =    scull_ioctl,

 

error: implicit declaration of function ‘init_MUTEX’

此问题前面也曾提到

 

四.做如下替换

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

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

五。到此编译成功

01	root@ubuntu:/home/allen/share/ldd3/src/scull# make

02	make -C /usr/src/linux-headers-2.6.38-8-generic/ M=/home/allen/share/ldd3/src/scull LDDINC=/home/allen/share/ldd3/src/scull/../include modules

03	make[1]: Entering directory `/usr/src/linux-headers-2.6.38-8-generic'

04	CC [M]  /home/allen/share/ldd3/src/scull/main.o

05	CC [M]  /home/allen/share/ldd3/src/scull/pipe.o

06	CC [M]  /home/allen/share/ldd3/src/scull/access.o

07	LD [M]  /home/allen/share/ldd3/src/scull/scull.o

08	Building modules, stage 2.

09	MODPOST 1 modules

10	CC      /home/allen/share/ldd3/src/scull/scull.mod.o

11	LD [M]  /home/allen/share/ldd3/src/scull/scull.ko

12	make[1]: Leaving directory `/usr/src/linux-headers-2.6.38-8-generic'