--------------------------------------------------------------------------------

i am try to compile a simple hello world module
===================
#include <linux/module.h> /* Needed by all modules */
#include <linux/kernel.h> /* Needed for KERN_ALERT */
#if CONFIG_MODVERSIONS==1
#define MODVERSIONS
#include <linux/modversions.h>
#endif
int init_module(void)
{
printk("Hello world 1.\n");
// A non 0 return means init_module failed; module can't be loaded.
return 0;
}
void cleanup_module(void)
{
printk("Goodbye world 1.\n");
}
===============
on there included linux/modue.h have a structure atomic_t
this sturcture no have any defnition in any part of this header file or in any dependent header file

so plese help me to solve this proble this proble create a compiletion error

solution i dont know

could you show how you are trying to compile the module?

also, try reading the manuals for linux kernel programming.

http://www.ibiblio.org/pub/Linux/doc...ramming-guide/

these would help you understand the kernel programming a lot better.

what compilation errors are you getting - could you post that?
shouldnt it be #ifdef and not #if?

I recommend getting the O'Reilly Book Linux Device Drivers from the book store if you are planning on doing any serious driver development. I have done some networking stuff, and a few special purpose drivers and that book help me a bunch.

As for the error you are getting, tell us exactly what it is and what you are doing to compile the file and we can offer more help.

Hi all....

I think, i m also getting same type of error

This is code:
-------------

#define MODULE
#include<linux/module.h>
int init_module(void)
{
printk("<1>Hello,World\n");
return 0;
}
void cleanup_module(void)
{
printk("<1>GoodBye\n");
}

i has compiled using

[root]# gcc -c Module1.c

when i m running the object file, i m getting the error like

[root@thirumalai LinuxModule]# insmod Module1.o

Module1.o: kernel-module version mismatch
Module1.o was compiled for kernel version 2.4.20
while this kernel is version 2.4.22-1.2115.nptl.

Please give me good solution for this.......how to compile and run the kernel module prm.....

search the forum for version mismatch, it's been answered a dozen times.

Thank u for reply...

i have got the solution from

http://www.vijaymukhi.com/documents/...nux/chap5.html