linux内核模块问题

[sunjing]

我需要修改linux内核的一个模块,我在redhat9.0(kernel 2.4.20-8)下修改并编译,可以使用,但我想把模块拿出来单独编译也成功(用gcc -**),我把模块拷贝到相应目录下并用insmod加载,但失败,提示如下:
printer.o:kernel-module version mismatch
printer.o was compiled for kernel version 2.4.20-8custom
while this kernel is version 2.4.20-8

我还想在redhat7.2--redhat9.0都用这一个模块?请问有甚麽解决办法?

[compboy1]

你查看过相应的makefile文件吗？

[LinHanLao]

gcc编译时指定该内核版本的头文件目录

-I/usr/src/linux-xxx(内核源代码目录)/include

[jian]

要指定include目录

[fwx325]

每个模块都定义了一个叫kernel_version的符号，insmod检查这个符号与当前的内核版本好匹配。可移植的接口：
#define __NO_VERSION__ //don't define kernel_version in module.h

#define <linux/module.h>

#define <linux/version.h>

[int10]

gz,我也碰上了这个问题，好烦哦。。

[xjl1980_81]

-I/usr/src/linux-xxx(内核源代码目录)/include

同意!!

[leotiger]

fwx325(fwx325)说的没错，linux较新的内核都增加了一个特性叫versioned kernel。在你向内核增加模块（当然实际上是内核的一部分）时，检查version是否匹配。如果你要在不同内核之间保持兼容，那么就在模块源文件内加上：
#undef __NO_VERSION__ //just in case
#define __NO_VERSION__

[sunjing]

leotiger :
我试了一下，不行，请问能不能再详细地说一下，多谢()

[linux1028]

知识产权，不容票切

[leotiger]

sorry, __NO_VERSION__ has been obsolete since 2.3 kernel, if you are using kernel after 2.4 or later, it's really a tough problem.
It seems linus doesn't want one same kernel module being used among different kernel versions :-(

[leotiger]

In fact,It's a mission impossible. Think about it, the kernel modules before 2.4 are .o files,and the ones for 2.5/2.6 are .ko files. The format has been changed!

Forget about module file format compatibility among kernel versions :-)