linux-kernel - Makefile for kernel modules

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Message-ID: <AANLkTikKjP-VLkygYbyg8THiCuM=vBfGaqq49+cuBj6u@mail.gmail.com>
Date:	Sat, 2 Oct 2010 21:20:16 +0400
From:	Dragoslav Zaric <zaricdragoslav@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Makefile for kernel modules

Dear all,

I have a question about kernel modules compilation. I understand the
way how make/Makefile works,
for example if I have two source files, hexdump3.asm and textlib.asm,
my Makefile will look like this:
---------------------------------------------------------------------------
hexdump3: hexdump3.o
	ld -o hexdump3 hexdump3.o textlib.o
hexdump3.o: hexdump3.asm
	nasm -f elf -g -F stabs hexdump3.asm
textlib.o: textlib.asm
	nasm -f elf -g -F stabs textlib.asm
---------------------------------------------------------------------------
and I understand how this works, it goes bottom up, building dependencies first.

But if I have two kernel modules source files, for example, start.c
and stop.c, my Makefile will look like this:
---------------------------------------------------------------------------
obj-m += startstop.o
startstop-objs := start.o stop.o

all:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
---------------------------------------------------------------------------
But this does not work on my machine, it runs without errors but does
not produce startstop.ko file.
Also, when I run make on my machine, first line that appears is:
---------------------------------------------------------------------------
make -C /lib/modules/2.6.33.7-rt29/build
M=/home/maiev/work/modules/parts modules
---------------------------------------------------------------------------

So, does anybody know what are lines for manual kernel module
compilation using probably gcc,
without 'obj-m +=' or at least how Makefile should look for multiple
kernel module source files ???

Kind regards

--
Dragoslav Zaric

Professional Programmer
MSc Astrophysics
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