hello world driver

    apt install linux-headers-`uname -r`

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

    MODULE_LICENSE("GPL");

    static int hello_init(void)
    {
        printk("Hello word\n");
        return 0;
    }


    static void hello_exit(void)
    {
        printk("Goodbye,Hello word\n");
    }

    module_init(hello_init);
    module_exit(hello_exit);

    obj-m+=hello.o
    all:
        make -C /lib/modules/$(shell uname -r)/build/ M=$(shell pwd) modules
    clean:
        make -C /lib/modules/$(shell uname -r)/build/ M=$(shell pwd) clean