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What to prepare before start Linux kernel module development?

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http://unix.stackexchange.com – I have couple years C programming experience. Now I decided to working towards Linux kernel module development. However, I can't even get started. I have compiled this code in Ubuntu: #include <linux/module.h> int init_module(void){ printk("<1> hellp"); return 0;} void cleanup_module(void){ printk("<1> bye");} However, the insmod is not working the error message is "Invalid module format". After googling I figured it may be some problem with version compatibility. Is there really no good way to solve it? So can some real kernel module developer give me some advice? What (HowTos)

Danial's picture
Submitted by Danial on 10/06/2012

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Building Linux modules. 2 years 34 weeks ago

I am facing a problem while building a kernel module.

file1.c:

Quote:

#include <linux/kernel.h> #include <linux/module.h> #include "sam.h"

int __init sam_init(void) { printk(KERN_INFO "Hello, world - this is the kernel speaking\n"); return 0; }

module_init(sam_init);

file2.c

Quote:

#include <linux/ke

Hello. Please, show me a correct Makefile for compiling a kernel module which consist of two *.c files.

My .c files:

module.c: //******************************************* #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/interrupt.h>

Invalid module format 3 years 19 weeks ago

Hi, I have a problem with loading the powersaving kernel module p4-clockmod.ko. When I try inserting the module (via modprobe or insmod) I get

FATAL: Error inserting p4_clockmod (/lib/modules/2.6.31.8-mediaserver/extra/p4-clockmod.ko): Invalid module format

The module has been compiled together with the kernel. Other modules load with no problem at all.

my os is centos

kernel is 2.6.18-92.1.17.el5xen.

fuse version is fuse-2.7.4 I compiled it like this：

./configure --enable-kernel-module --with-kernel=/usr/src/linux make &&　make install

then "modprobe fuse",but it warned like this:

FATAL: Error inserting fuse (/lib/modules/2.6.18-92.1.17.el5xen/kernel/fs/fuse/fuse.ko): Operation not permitted

but I did it as root.

an

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