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. |
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 |
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
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. |
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' |
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