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struct list_head {
struct list_head *next, *prev;
};
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#define LIST_HEAD_INIT(name) { &(name), &(name) }
#define LIST_HEAD(name) \
struct list_head name = LIST_HEAD_INIT(name)
static inline void INIT_LIST_HEAD(struct list_head *list)
{
list->next = list;
list->prev = list;
}

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list.hÖл¹¶¨ÒåÁË list_add() £¬ list_add_tail()£¬list_del()µÈ»ù±¾µÄÁ´±í²Ù×÷º¯Êý£¬¶¼ÊDZȽϼòµ¥µÄ
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ÔÚlist.hÖм«ÆäÓÐÓõÄÒ»¸öºêÊÇlist_for_each_entry
#define list_for_each_entry(pos, head, member) \
for (pos = list_entry((head)->next, typeof(*pos), member); \
prefetch(pos->member.next), &pos->member != (head); \
pos = list_entry(pos->member.next, typeof(*pos), member))
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kernel/workqueue.c
59 struct workqueue_struct {
60   struct cpu_workqueue_struct cpu_wq[NR_CPUS];
61   const char *name;
62   struct list_head list; /* Empty if single thread */
63 };
  ...
466   case CPU_ONLINE:
467     /* Kick off worker threads. */
468     list_for_each_entry(wq, &workqueues, list)
469     &nb


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