This is a simple code source of kernel module "Hello world".

$ cd $HOME
$ mkdir devel
$ cd devel
$ git clone https://github.com/ichergui/hello-world.git

It will be possible to use the Makefile.

$ cd $HOME/devel/hello-world
$ make all

$ sudo insmod hello_world.ko

• verification

$ lsmod | grep -i "hello"
hello_world            16384  0

Try with the command line dmesg to see what's happened.

$ dmesg | tail

$ sudo rmmod hello_world