源代码：
1 #include <linux/module.h>
2 #include <linux/init.h>
3 #include<linux/sched.h>
4 #include<linux/sem.h>
5 #include <linux/slab.h>
6 #include <linux/list.h>
7
8 MODULE_LICENSE("Dual BSD/GPL");
9
10 struct group{
11 int id;
12 char character;
13 struct list_head member;
14 };
15
16
17 int list_head_init(void)
18 {
19 printk("list_head init\n");
20
21 struct group testhead={
22 .id=-1,
23 .character='a',
24 .member=LIST_HEAD_INIT(testhead.member),
25 };
26
27 //插入10个元素
28 int i=0;
29 for(i=0;i<10;i++)
30 {
31 struct group *testtemp;
32 testtemp=kmalloc(sizeof(struct group),GFP_KERNEL);
33 if(testtemp==NULL) return -1;
34 testtemp->id=i;
35 testtemp->character=(char)(64+i);
36 list_add(&testtemp->member,&testhead.member);
37 //printk(KERN_ALERT"%d--->%c\n",testtemp->intdata,testtemp->chardata);
38 }
39
40
41 //遍历10个元素
42 struct group *groups,*p;
43 struct list_head *pos;
44 int count=0;
45 printk(KERN_ALERT"Hello World enter begin:\n");
46 groups=&testhead;
47 list_for_each(pos,&groups->member)
48 {
49 p=list_entry(pos, struct group, member);
50 count++;
51 printk(KERN_ALERT"id is %d---> name %c\n",p->id,p->character);
52 }
53 printk(KERN_ALERT"the member of group is:%d\n",count);
54
55 //删除元素
56 list_del(&p->member);
57 count=0;
58
59 //遍历剩余元素
60 list_for_each(pos,&groups->member)
61 {
62 p=list_entry(pos, struct group, member);
63 count++;
64 printk(KERN_ALERT"id is %d---> name %c\n",p->id,p->character);
65 }
66 printk(KERN_ALERT"the member of group is:%d\n",count);
67
68 return 0;
69 }
70 static void list_head_exit(void)
71 {
72 printk("list_head exit\n");
73 }
74
75 module_init(list_head_init);
76 module_exit(list_head_exit);
77
Makefile :
1 obj-m := list_head.o
2 KERNELDIR := /lib/modules/$(shell uname -r)/build
3 PWD := $(shell pwd)
4 modules:
5 $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
6 modules_install:
7 $(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install
8 clean:
9 rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions $(TARGET)
运行命令：
1 root@lab:sudo su
2 root@lab:make
3 root@lab:insmod list_head.ko
4 root@lab:dmesg
5 root@lab:rmmod list_head.ko
