so confuse

kernalcode.c

struct struct_i_want_to_put_inna_list {
  struct list_head nextelem;
  int mydata;
};

struct list_head my_list;

INIT_LIST_HEAD(&my_list);

struct struct_i_want_to_put_inna_list *current_elem;

int sum_of_two_first_elements = 0;

current_elem = first_entry_or_null(my_list, struct struct_i_want_to_put_inna_list, nextelem);

sum_of_two_first_elements += current_elem->mydata;

current_elem = first_entry_or_null(current_elem->nextelem, struct struct_i_want_to_put_inna_list, nextelem);

sum_of_two_first_elements += current_elem->mydata;

//and now sum_of_two_first_elements contains the sum of the mydata fields in the two first cells of the linked list