编译内核驱动程序，没有报错但没有生成ko文件，请大家帮看下

Question

系统：centos7.2
内核版本：5.3.7
内核代码：

#include <linux/init.h>
#include <linux/module.h>
#include <linux/netfilter.h>
#include "sockopt_test.h"

#define BUFFER_LEN_MAX 1024
static char buffer[BUFFER_LEN_MAX];

/* setsockopt 回调处理函数 */ 
int setsockopt_handler(struct sock *sk, int optval, void __user *user, unsigned int len)
{

        switch(optval)
        {
            case SOCKOPT_SET_BUFFER:
                if ( copy_from_user((void*)&buffer, user, len) != 0 ) 
                {
                        return -EFAULT;
                }

                break;
            default:
                printk(KERN_INFO "invalid setsockopt opt : %d\n", optval);
                return -EFAULT;
        }

        printk(KERN_INFO "buffer[]: %s\n", buffer);
        return 0;
}

/* getsockopt 回调处理函数 */  
int getsockopt_handler(struct sock *sk, int optval, void __user *user, int *len)
{
        unsigned int cpy_len;

        cpy_len = *len > BUFFER_LEN_MAX ? BUFFER_LEN_MAX : *len;
        switch(optval)
        {
            case SOCKOPT_GET_BUFFER:
                if(copy_to_user(user, (void*)&buffer[0], cpy_len) != 0) 
                {
                        printk(KERN_INFO "getsockopt_handler fail \n");
                        return -EFAULT;
                }

                    break;
            default:
                    printk(KERN_INFO "unrecognized getsockopt optvalue : %d\n", optval);
                    return -EFAULT;
        }

        return 0;
}

/* 定义nf_sockopt_ops结构体 */ 
static struct nf_sockopt_ops sockopt_ops_test =
{
        .pf                     = PF_INET,
        .set_optmin             = SOCKOPT_SET_MIN,
        .set_optmax             = SOCKOPT_SET_MAX,
        .set                    = setsockopt_handler,
        .get_optmin             = SOCKOPT_GET_MIN,
        .get_optmax             = SOCKOPT_GET_MAX,
        .get                    = getsockopt_handler,
};

static __init int sockopt_test_init(void)
{
        int result;
        /* 注册sockopt */
        result = nf_register_sockopt(&sockopt_ops_test);
        if(result != 0) 
        {
                printk("register sockopt error!\n");
        }

        printk("sockopt_test register success !\n");
        return 0;
}

static __exit void sockopt_test_exit(void)
{
        /* 注销sockopt */
        nf_unregister_sockopt(&sockopt_ops_test);
        printk("sockopt_test unregister\n");
}

module_init(sockopt_test_init);
module_exit(sockopt_test_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Stone");

MakeFile:

Answer 1

https://bbs.csdn.net/topics/360163756