From mboxrd@z Thu Jan  1 00:00:00 1970
From: dhylands@gmail.com (Dave Hylands)
Date: Wed, 15 Jun 2011 10:54:26 -0700
Subject: kernel module spanning multiple files
In-Reply-To: <BANLkTikGBN8qiM4A=RWO7=U6+QncNtrsaQ@mail.gmail.com>
References: <BANLkTikABcC70AOPHh9RsRfs1+fbMPM-1w@mail.gmail.com>
	<BANLkTikGBN8qiM4A=RWO7=U6+QncNtrsaQ@mail.gmail.com>
Message-ID: <BANLkTincouGQ_zksdDNLs9PfDXMZJZf8Cg@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hi Prashat,

On Wed, Jun 15, 2011 at 10:29 AM, Prashant Shah <pshah.mumbai@gmail.com> wrote:
> Hi amit,
>
> On Wed, Jun 15, 2011 at 3:29 PM, amit mehta <gmate.amit@gmail.com> wrote:
>> Hi,
>>
>> static int __init hello_init(void)
>> {
>> ? ? ? ?printk(KERN_WARNING "Hello world\n");
>> ? ? ? ?foo(); //defined in anther file
>
> I removed the foo(); call
>
>> [root at localhost #] cat Makefile
>> obj-m += hello_multi.o
>> hello_multi-objs := helper.o
>
> I removed the "hello_multi-objs := helper.o" line

The hello_multi-objs is supposed to contain all of the objects.

So you need:

hello_multi-objs := object1.o object2.o

Since the kernel build system will create hello_multi.o as a result of
building the multi object, you can't use a source file named
hello-multi.c.

You could do

hello_multi-objs := hello.o helper.o

and rename your hello_multi.c to be hello.c

-- 
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com