步骤一、编写hello.c。
代码如下：
#include
#include
MODULE_LICENSE("Dual BSD/GPL");
static int hello_init(void)
{
printk(KERN_INFO " Hello World enter\n");
return 0;
}

static void hello_exit(void)
{
printk(KERN_INFO " Hello World exit\n ");
}

module_init(hello_init);
module_exit(hello_exit);

步骤二、编写makefile。
内容如下：
ifneq ($(KERNELRELEASE),)
obj-m := hello.o
# Otherwise we were called directly from the command
# line; invoke the kernel build system.
else
KERNELDIR = /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
default:
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
endif