Kernel Module

[rtlab]

Hello everyone,
I am writing a very simple kernel module that is available on the net.
But while compiling it I am getting the error for include files.

Can anyone please tell me what is the procedure for include files for kernel modules.

It would be really helpful if I get an example or a link I can get to learn about include files and kernel module programming starting from basics.

[rtlab]

The Module I got only have printk in the init_module() and that in cleanup_module().

It has a include file named uaccess.h
It is not getting this file.
I dont know where exactly the kernel module needs its include files.
Is there any specific location.

I am compiling it using gcc.
and then using a Makefile for making a .ko .
Which I suppose then will be inserted as a module using "insmod"
and removed using "rmmod"

If there is any other way to do it please tell me.

I am reading Linux Kernel Module Programming .pdf O'reilly 2nd edition.

[rtlab]

the code looks something like this
I dont know why it requires that uaccess.h

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

int init_module(void)
{
printk(KERN_INFO "init_module() called\n");
return 0;
}

void cleanup_module(void)
{
printk(KERN_INFO "cleanup_module() called\n");
}

I tried to locate uaccess.h but not in linux named folder




Makefile looks like this

obj-m += hello.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

[gerard4143]

Could you please use code tags so that we can see if the formating of your make file is correct..

Also if you open a terminal and su root and type

cd /lib/modules/$(uname -r)/build

What do you get?

[maheshgupta024]

Do you have the linux source in the given folder ?????

[saurabh.nigam]

here is the MAkefile example(pls notice the usage of tab if you have provided 8 spaces that would be wrong)

obj-m += usb-skeleton.o

all:
<tab>make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
<tab>make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

save it & then run

#make

try compiling your code without writing include<uaccess.h> line this could be a user defined header by the author