Linux Device Drivers Development

Linked list traversal

We have the macro list_for_each_entry(pos, head, member) for list traversal:

• head is the list's head node.
• member is the name of the struct list_head list within our data struct (in our case, it is list).
• pos is used for iteration. It is a loop cursor (just like i in for(i=0; i<foo; i++)). head could be the head node of the linked list, or any entry, and we don't care since we are dealing with a doubly linked list:

struct car *acar; /* loop counter */ 
int blue_car_num = 0; 
 
/* 'list' is the name of the list_head struct in our data structure */ 
list_for_each_entry(acar, carlist, list){ 
    if(acar->color == "blue") 
        blue_car_num++; 
} 
 

Why do we need the name of the list_head type field in our data structure? Look at the ...