Error building 'Hello,World' kernel Module

[Lei Yang <leiyang@nec-labs.com>]

Hello,

I am learning about module programming and just tried to build a
simplest module, Hello World.

The code is as follows:
/* hello.c
#include <linux/module.h>       
#include <linux/kernel.h>      

int init_module(void)
{
        printk("Hello world!\n");
        return 0;
}

void cleanup_module(void)
{
        printk(KERN_ALERT "Goodbye world!\n");
}


The makefile is just one line:
 obj-m += hello.o

Then as root, I did in the HelloWorld directory:

make -C /usr/src/linux-`uname -r` SUBDIRS=$PWD modules

There is such an error:
make: Entering directory `/usr/src/linux-2.6.5-7.104-default'

WARNING: Symbol version dump
/usr/src/linux-2.6.5-7.104-default/Module.symvers is  missing, modules
will have CONFIG_MODVERSIONS disabled.

make[1]: *** No rule to make target `/home/lei/HelloWorld/hello.c',
needed by `/home/lei/HelloWorld/hello.o'.  Stop.
make: *** [_module_/home/lei/HelloWorld] Error 2
make: Leaving directory `/usr/src/linux-2.6.5-7.104-default'


Appreciate any comments and help!

TIA
Lei


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