blob: 344c710d16ca427ca44c3a2c348b3593e80174a4 [file] [log] [blame]
Dave Jones199a9af2006-09-29 01:59:00 -07001/*
2 * Copyright 2006, Red Hat, Inc., Dave Jones
3 * Released under the General Public License (GPL).
4 *
5 * This file contains the linked list implementations for
6 * DEBUG_LIST.
7 */
8
9#include <linux/module.h>
10#include <linux/list.h>
11
12/*
13 * Insert a new entry between two known consecutive entries.
14 *
15 * This is only for internal list manipulation where we know
16 * the prev/next entries already!
17 */
18
19void __list_add(struct list_head *new,
20 struct list_head *prev,
21 struct list_head *next)
22{
Dave Jones924d9ad2008-07-25 01:45:55 -070023 WARN(next->prev != prev,
24 "list_add corruption. next->prev should be "
25 "prev (%p), but was %p. (next=%p).\n",
26 prev, next->prev, next);
27 WARN(prev->next != next,
28 "list_add corruption. prev->next should be "
29 "next (%p), but was %p. (prev=%p).\n",
30 next, prev->next, prev);
Dave Jones199a9af2006-09-29 01:59:00 -070031 next->prev = new;
32 new->next = next;
33 new->prev = prev;
34 prev->next = new;
35}
36EXPORT_SYMBOL(__list_add);
37
38/**
Dave Jones199a9af2006-09-29 01:59:00 -070039 * list_del - deletes entry from list.
40 * @entry: the element to delete from the list.
41 * Note: list_empty on entry does not return true after this, the entry is
42 * in an undefined state.
43 */
44void list_del(struct list_head *entry)
45{
Baruch Siache3f76e32010-08-09 17:20:53 -070046 WARN(entry->next == LIST_POISON1,
47 "list_del corruption, next is LIST_POISON1 (%p)\n",
48 LIST_POISON1);
49 WARN(entry->next != LIST_POISON1 && entry->prev == LIST_POISON2,
50 "list_del corruption, prev is LIST_POISON2 (%p)\n",
51 LIST_POISON2);
Dave Jones924d9ad2008-07-25 01:45:55 -070052 WARN(entry->prev->next != entry,
53 "list_del corruption. prev->next should be %p, "
54 "but was %p\n", entry, entry->prev->next);
55 WARN(entry->next->prev != entry,
56 "list_del corruption. next->prev should be %p, "
57 "but was %p\n", entry, entry->next->prev);
Dave Jones199a9af2006-09-29 01:59:00 -070058 __list_del(entry->prev, entry->next);
59 entry->next = LIST_POISON1;
60 entry->prev = LIST_POISON2;
61}
62EXPORT_SYMBOL(list_del);