Howto override kernel versioning while using insmod?

["pb_chakra" <pb_chakra@indiatimes.com>]

Hi 

I am a newbie to Linux kernel. I am reading
Alessandro Rubini's "Linux Device Drivers".

I have trouble executing a simple sample code 
given in chapter 2 of the book:

/********hello.c***************/
#define MODULE
#include <linux/module.h>
#include <linux/kernel.h>

int init_module(void)      { printk("<1>Hello, world\n"); return 0; }
void cleanup_module(void)  { printk("<1>Goodbye cruel     world\n"); }

/*********end*******************/

root# gcc -c hello.c
root# insmod ./hello.o

./hello.o: kernel-module version mismatch
        ./hello.o was compiled for kernel version 2.4.9-9
        while this kernel is version 2.4.18-3.

I looked at the man page for insmod and found
that the -f switch can be used to override kernel versioning.So I did,

root# insmod -f ./hello.o
Warning: kernel-module version mismatch
        ./hello.o was compiled for kernel version 2.4.9-9
        while this kernel is version 2.4.18-3
Warning: loading ./hello.o will taint the kernel: no license
Warning: loading ./hello.o will taint the kernel: forced load

root# rmmod -f hello
root# 

I have a few naive questions:

1. Why does gcc compile hello.c for 2.4.9-9
while my kernel's version is 2.4.18-3 ?
2. Why was insmod's -f switch not effective ?
3. How to make this code work? !!

Thanks in advance,
Chakra.
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