How to write a kernel module(kernel object, .ko) on linux-2.6.0?
 

here is an example, anything wrong ?

//---------hello.c----------------
#include <linux/kernel.h>
#include <linux/module.h>
int init_module(void)
{
printk("hello world\n");
return 0;
}
void cleanup_module(void)
{
printk("bye\n");
}
//------end of hello.c-------

I compiled it with command:
gcc -I/usr/src/linux-2.6.0-test7/include -D_KERNEL_ -DMODULE -DKBUILD_MODNAME=hello -c hello.c
ant then I got may "undeclared" errors.

This is the first time for me to write kernel module on 2.6, and I even don't know how to generate a .ko file.
:(

Disclaimer: I don't know about 2.6 kernel internals.

If they mostly work as 2.4, one of the flags should be '-D__KERNEL__'

Also I would recommend the Linux device drivers book (still on 2.4, but should be applicaple to 2.6 in some extent).