第一个linux内核模块程序——Hello World

//hello.c
#include
#include
#include
//必选
//模块许可声明
MODULE_LICENSE("GPL");
//模块加载函数
static int hello_init(void)
{
        printk(KERN_ALERT "hello,I am Kingwen\n");
        return 0;
}
//模块卸载函数
static void hello_exit(void)
{
        printk(KERN_ALERT "goodbye,kernel\n");
}
//模块注册
module_init(hello_init);
module_exit(hello_exit);
//可选
MODULE_AUTHOR("kingwen");
MODULE_DESCRIPTION("This is a simple example!\n");
MODULE_ALIAS("A simplest example");

//Makefile
obj-m += hello.o
#generate the path
CURRENT_PATH:=$(shell pwd)
#the current kernel version number
LINUX_KERNEL:=$(shell uname -r)
#the absolute path
LINUX_KERNEL_PATH:=/usr/src/kernels/$(LINUX_KERNEL)
#complie object
all:
        make -C $(LINUX_KERNEL_PATH) M=$(CURRENT_PATH) modules
#clean
clean:
        make -C $(LINUX_KERNEL_PATH) M=$(CURRENT_PATH) cleane

注意Makefile的M一定要是大写，不能命名为makefile