哈稀链表图示

struct hlist_node {
    struct hlist_node *next, **pprev
};

 
static inline void __hlist_del(struct hlist_node *n)
{
    struct hlist_node *next = n->next;
    struct hlist_node **pprev = n->pprev;
    *pprev = next;
    if (next)
        next->pprev = pprev;
}