linux-kernel - [RFC]Module problem

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Date:	Thu, 5 Apr 2012 16:20:25 +0800
From:	harryxiyou <harryxiyou@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: [RFC]Module problem

Hi list,

When i write an easy module for testing, it happens to me a problem, which
is like this "Building modules, stage 2.  MODPOST 0 modules". I can not
find the *.ko file.

My Module file is like this:

hello.c

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

static int __init hello_init(void) {
printk("<1> Hello World\n");
return 0;  }

static void __exit hello_exit(void) {
printk("<1> Goodbey\n");
return ;  }

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

Makefile is like this:

obj-m += hello.o

all:
                make -C /usr/src/linux-headers-3.0.0-12-generic
M=/home/sel/homeworl modules

clean:
               make -C /usr/src/linux-headers-3.0.0-12-generic
M=/home/sel/homeworl clean


   When i compile my modules as up Makefile, i cannot get my hello.ko
file. However, when
i change the Makefile like following it is ok for me.

obj-m :=hello.o
ifneq ($( KERNELRELEASE),)

else

KERNELDIR ?= /lib/modules/$(shell uname -r)/build

PWD :=$(shell pwd)
default:

             $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
endif

     I cannot understand this well Makefile clearly. Cloud anyone give
me a help ;-)

My kernel version is 2.6. Ubuntu 10.04. x86 32bits.

-- 
Thanks
Harry Wei
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