#include <linux/slab.h>

struct list_element
{
    void *data;                 // the payload
    struct list_element *next;  // pointer to the next element
    struct list_element *preV;  // pointer to the previous element
};

int main()
{
    struct list_element *root;
    root = kmalloc(sizeof(*root), GFP_KERNEL);
    root -> data = 20;
    root -> next = kmalloc(sizeof(*root), GFP_KERNEL);
    root -> next = NULL;

}