lkm.c

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

#define DEVICENAME "LKMDevice"

#define bail_assert(s, label, fmt, ...)                                 \
	do {                                                                \
		if (!(s)) {                                                     \
			printk(KERN_ALERT DEVICENAME " " fmt "\n", ##__VA_ARGS__);  \
			goto label;                                                 \
		}                                                               \
	} while(0)                                                          \


#define kinfo(fmt, ...)                                                 \
	do {                                                                \
		printk(KERN_INFO DEVICENAME " " fmt "\n", ##__VA_ARGS__);       \
	} while(0)                                                          \

#define kalert(fmt, ...)                                                \
	do {                                                                \
		printk(KERN_ALERT DEVICENAME " " fmt "\n", ##__VA_ARGS__);      \
	} while(0)                                                          \

static int __init lkm_init(void)
{
    kinfo("inited");
    return 0;
}

static void __exit lkm_exit(void)
{
    kinfo("exited");
}

module_init(lkm_init);
module_exit(lkm_exit);