Hai i am using ubuntu 6.06 (2.6.15-23-amd64 kernel)

Recently i have downloaded a driver programming tutorial.
It has a small helloworld program.

program : hello.c
#define MODULE
#include <linux/module.h>
int init_module(void) { printk("<1>Hello, world\n"); return 0; }
void cleanup_module(void) { printk("<1>Goodbye cruel world\n"); }

i tried to compile program using "gcc -c hello.c" command and it failed
then i removed the line #include<linux/module.h>, then it compilied successfully
and hello.o is created.

Then i tried to insert the module into kernel using the command
"insmod ./hello.o"
but it failed with the error "invalid module"

I came to know from google search that we have to compile the kernel for this to work.

can any body tell me how to compile the kernel and make this module work

The kernel is already compiled, you're running it. If you're going to compile kernel modules the you need the kernel headers, you'll also need to include the headers in the search path.
Something like this should do it;
A better place to ask this would probably be in the Linux Kernel forum.

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Doesn't sound like much of a tutorial to me.
Try buying a decent book - maybe Linux Device Drivers by Corbet et al.

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