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Message-ID: <20050507131928.10643.qmail@web60519.mail.yahoo.com>
Date: Sat, 7 May 2005 06:19:28 -0700 (PDT)
From: li nux <lnxluv@yahoo.com>
Subject: compiling "hello world" kernel module on 2.6 kernel
To: linux <linux-kernel@vger.kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org
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I have written a minimal hello world kernel module.
(see the Makefile and hello.c below)
But I am not able to build it using the kernel build
system.Any idea why this is happening.

I referred  "Chapter 2: Building and Running Modules"
of
http://www.oreilly.com/catalog/linuxdrive3/book/index.csp

I am using SLES9
My kernel sources are at /local/usr/linux-2.6.5-7.162
This is the kernel i am running.

On doing a make it gives me following output, but does
not build hello.o
----------------------------------------------
$ make
make -C /lib/modules/2.6.5-7.162-bigsmp/build
M=/local/usr/linux-2.6.5-7.162 modules
make[1]: Entering directory
`/local/usr/linux-2.6.5-7.162'
  Building modules, stage 2.
  MODPOST
make[1]: Leaving directory
`/local/usr/linux-2.6.5-7.162'
--------------------------------------------------
This is my Makefile:

# If KERNELRELEASE is defined, we've been invoked from
# the kernel build system and can use its language.
ifneq ($(KERNELRELEASE),)
     obj-m := hello.o

# Otherwise we were called directly from the command
# line; invoke the kernel build system.
else
     KERNELDIR ?= /lib/modules/$(shell uname -r)/build
     PWD := $(shell pwd)

default:
         $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
endif
---------------------------------------------------
hello.c

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/vermagic.h>

static int __init hello_init (void)
{
        printk("module hello loading");
        return 0;
}

static void __exit hello_exit (void)
{
        printk("module hello exiting");
}

module_init(hello_init);
module_exit(hello_exit);
MODULE_LICENSE ("GPL");
--------------------------------------------------


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