Help. can't compile kernel module properly

3-1415 · 05-31-2005, 03:10 AM

Hi all
I am a newbie in kernel programming and of course faced such a trouble

I have 2 PCs with Slackware 10.0 and generic kernel vmlinuz-ide-2.4.29 installed on both of them. The PC 1-st pc works fine, on the 2-nd pc i can't compile properly the simplest kernel module like this:

Code:

#define MODULE
#define __KERNEL__
#include <linux/module.h>
#include <linux/kernel.h>
int init_module(void)
{
  printk("example.o: loaded\n");
  return 0;
}
void cleanup_module(void)
{
   printk("example.o: unloaded...\n");
}
=======================
Makefile:
CC=gcc
module=example
MODFLAGS:= -O3 -Wall -DLINUX
$(module).o:	$(module).c
		$(CC) $(MODFLAGS) -c $^ -o $@

The compilation works without warnings on both pc's, but when i try to load the module on my 2-nd pc i get such an error:
couldn't find the kernel version the module was compiled for
It looks as if i deleted first 2 define strings in the code(#define MODULE and #define __KERNEL__).
Other kernels on the 2-nd pc gives the same result

kryptonite0110 · 05-31-2005, 08:18 PM

a book i have on linux programming makes the code look more like this...

Code:

#define MODULE
#define __KERNEL__
#include <linux/module.h>
#if defined(CONFIG_MODVERSIONS)
#define MODVERSIONS
#include <linux/modversions.h>
#endif

#include <linux/kernel.h>
int init_module(void)
{
  printk("example.o: loaded\n");
  return 0;
}
void cleanup_module(void)
{
   printk("example.o: unloaded...\n");
}

maybe you just needed to include linux/modversions.h?
i'm not much of a kernel modules programmer myself, that's the way i always did it...

3-1415 · 06-01-2005, 02:54 AM

Unfortunately I can't try You example now, but if the same code works well on 1-st pc and does I can't catch wh the problemn't work properly on 2-nd one, there must be something wrong in system.

3-1415 · 06-01-2005, 02:56 AM

...Sorry
Unfortunately I can't try You example now, but if the same code works well on 1-st pc and doesn't work properly on 2-nd one, there must be something wrong in system.