Makefile for linux kernel module issue

Ask Time：2015-10-24T06:29:39 Author：kekyc

I'm writing a kernel module which will be a driver for my chinese Arduino.

I've read many guides about it and Makefiles in them are completely different. Some of them just is not working. And I want to understand how and why:)

For example, I have a simple beginner's code:

    #define MODULE
    #define __KERNEL__

    #include <module.h> // определения для модуля 
    #include <init.h> // module_init и module_exit
    #include <kernel.h> // printk

    MODULE_AUTHOR("...");
    MODULE_DESCRIPTION("Test module for linux kernel");

    int module_start() 
    {
        printk("This is a test module startup message\n");
        return 0;
    }

    void module_stop()
    {
        printk("Module is dead\n");
        return;
    }

    module_init(module_start);
    module_exit(module_stop);

And also I have a Makefile which I found in manual:

    CC=gcc
    MODFLAGS:= -O2 -Wall -DLINUX
    module.o: module.c
    $(CC) $(MODFLAGS) -c module.c

So, as I know, my system uses .ko files as a modules. This is the first problem. The second is that this makefile just doesn't work.

When I make, I'm getting the error "missing module.h". But I certainly installed headers. They are in /usr/src/linux-headers-(3.2.0-4-686-pae) and /usr/src/linux-headers-(3.2.0-4-common). There is no module.h in *pae directory, but it is in *common directory(most of the files are there). So, I just can't compile it neither with gcc nor the makefile.

Thank you for the answers.

Author:kekyc，eproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/33312323/makefile-for-linux-kernel-module-issue

Knud Larsen :

The \"standard Makefile\" for a module build is :\n\nobj-m := hello-1.o\n\nKDIR := /lib/modules/$(shell uname -r)/build\nPWD := $(shell pwd)\n\ndefault:\n $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules\n\nclean:\n rm -rf *.o *.ko *.mod.* *.symvers *.order\n\n\n( Creating hello-1.ko from hello-1.c )\n\nThe only headers used are the ones in /lib/modules/uname -r/build/include/.\n\nAnd there is no ``module.h´´ : Please enter like #include <linux/module.h> ( or asm/module.h ).\n\n",

2015-10-24T15:52:18

Makefile for linux kernel module issue