For the "Linux device driver III", the example of "chapter 4":
Delete the
Add the
Ok, now change into its derectory and complile it like this:
CFLAGS was changed in "/root/Desktop/examples/scull/Makefile". Fix it to use EXTRA_CFLAGS. Stop.
make[1]: *** [_module_/root/Desktop/examples/scull] Error 2
make[1]: Leaving directory `/usr/src/kernels/2.6.24.2-2lp-i686‘
make: *** [modules] Error 2
There are two kind of method to solve this problem:
(1)Rplace all CFLAGS with EXTRA_CFLAGS in the Makefile.
(2)Using the KBUILD_NOPEDANTIC arg
[[email protected] scull]# make KBUILD_NOPEDANTIC=1
make -C /lib/modules/2.6.24.2-2lp/build M=/root/Desktop/examples/scull LDDINC=/root/Desktop/examples/scull/../include modules
make[1]: Entering directory `/usr/src/kernels/2.6.24.2-2lp-i686‘
CC [M] /root/Desktop/examples/scull/main.o
CC [M] /root/Desktop/examples/scull/pipe.o
CC [M] /root/Desktop/examples/scull/access.o
LD [M] /root/Desktop/examples/scull/scull.o
Building modules, stage 2.
MODPOST 1 modules
CC /root/Desktop/examples/scull/scull.mod.o
LD [M] /root/Desktop/examples/scull/scull.ko
make[1]: Leaving directory `/usr/src/kernels/2.6.24.2-2lp-i686‘
2、linux/config.h: No such file or directory
$ make
make -C /lib/modules/2.6.18-1.2798a_FC6/build SUBDIRS=/home/njc/stuff/linux-labjack/driver/linux-2.6 modules
make[1]: Entering directory `/usr/src/redhat/BUILD/kernel-2.6.181.2798a_FC6‘
CC [M] /home/njc/stuff/linux-labjack/driver/linux-2.6/labjack.o
/home/njc/stuff/linux-labjack/driver/linux-2.6/labjack.c:43:26: error: linux/config.h: No such file or directory
make[2]: *** [/home/njc/stuff/linux-labjack/driver/linux-2.6/labjack.o] Error 1
make[1]: *** [_module_/home/njc/stuff/linux-labjack/driver/linux-2.6] Error 2
make[1]: Leaving directory `/usr/src/redhat/BUILD/kernel-2.6.181.2798a_FC6‘
make: *** [default] Error 2
A solution, which I based from a discussion in this bloghttp://www.phoronix.com/redblog/?p=blog&i=NTUwMA, would be to copy a config.h header file to your /lib/modules/KERNEL-VERSION/build/include/linux directory. If you have a previous kernel build on your computer you can copy the file from your /lib/modules/OLD-KERNEL-VERSION/build/include/linux directory. Alternatively you can just copy the code below into a self made config.h file
CODE
#ifndef _LINUX_CONFIG_H
#define _LINUX_CONFIG_H
#include
#endif
错误：
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c: In function ‘scumm_open‘:
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c:54: error: dereferencing pointer to incomplete type
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c:54: error: dereferencing pointer to incomplete type
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c: In function ‘scumm_release‘:
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c:96: error: dereferencing pointer to incomplete type
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c:96: error: dereferencing pointer to incomplete type
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c: In function ‘scumm_read‘:
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c:140: error: dereferencing pointer to incomplete type
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c:140: error: dereferencing pointer to incomplete type
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c: In function ‘scumm_write‘:
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c:210: error: dereferencing pointer to incomplete type
/home/lingd/arm2410s/ldd3/chapter4/scumm/scumm.c:210: error: dereferencing pointer to incomplete type
出错语句：
printk(KERN_DEBUG "\"%s(pid %d)\" open scumm device!\n", current->comm, current->pid);
宏current定义在arch/arm/include/asm/current.h中，
static inline struct task_struct *get_current(void)
{
return current_thread_info()->task;
}
#define current (get_current())
出错原因：
编译器不知道task_struct的具体定义，因此，无法解引用current，无法获知其成员comm、pid的类型，才报“dereferencing pointer to incomplete type”
task_struct定义在中。在源文件头，加上#include ，即可解决问题！
“dereferencing pointer to incomplete type”错误，大多也是因为不知道struct/class/emun/union等的定义而引起的
4、‘struct task_struct‘ has no member named ‘uid‘
/home/jqzeng/workSpace/ldd3/ldd3-samples-1.0.0/scull/access.c:107:29: error: ‘struct task_struct‘ has no member named ‘uid‘
/home/jqzeng/workSpace/ldd3/ldd3-samples-1.0.0/scull/access.c:108:29: error: ‘struct task_struct‘ has no member named ‘euid‘
原因：新的struct task_struct 定义有变化，uid和euid在cred结构体中。
解决办法：加头文件cred.h，将 current->uid改为current->cred->uid，current->euid改为current->cred->euid
#include
108 if (scull_u_count &&
109 (scull_u_owner != current->cred->uid) && /* allow user */
110 (scull_u_owner != current->cred->euid) && /* allow whoever did su */
...
117 scull_u_owner = current->cred->uid; /* grab it */