# 最简单的内核模块：
#include
#include
static int my_driver_init(void)
{
printk("hello
");
return 0;
}
static my_driver_exit(void)
{
printk("byebye
");
}
module_init(my_driver_init);
module_exit(my_driver)_exit);
MODULE_AUTHOR("hanshanjie");
MODULE_LICENSE("GPL");
其中，module_init()表名模块的入口，该函数在模块加载时候被调用，即insmod，modprobe时候被调用。该函数指定的函数，试分析一个驱动最先关注的，类似于main函数。
Makefile编写：
CROSS_COMPILE ?=
CC = $(CROSS_COMPILE)gcc
obj-m := hello.o
KERNELDIR =
PWD := $(shell pwd)
deafult: $(MAKE) -C $(KERNELDIR) M=$(PWD) ARCH=arm CROSS_COMPILE= modules
clean: $(MAKE) -C $(KERNELDIR) M=$(PWD) ARCH=arm CROSS_COMPILE= clean
rm -f *.ko *.mod *.symvers *~*.order
实际编译时候：
make -C /home/parallels/work31017/kernel_source/3.10.17-r0/ M=/home/parallels/work31017/helloko/ ARCH=arm CROSS_COMPILE=/opt/poky/1.5.3/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-
modules
过程：
make: Entering directory `/home/parallels/work31017/kernel_source/3.10.17-r0'
CC [M] /home/parallels/work31017/helloko/hello.o
Building modules, stage 2.
MODPOST 1 modules
CC /home/parallels/work31017/helloko/hello.mod.o
LD [M] /home/parallels/work31017/helloko/hello.ko
make: Leaving directory `/home/parallels/work31017/kernel_source/3.10.17-r0'生成：
hello.ko hello.mod.c hello.mod.o hello.o Makefile modules.order Module.symver
安装驱动：insmod
显示hello
卸载驱动 rmmod
显示byebye
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://www.xiaopingtou.cn//data/attach/topic/topicKPo7gB.jpg', '推荐 enmfve 的文章《嵌入式Linux最简单驱动模块编译与剖析》','https://www.xiaopingtou.net/article-65773.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}