Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
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{
23 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);
31 next->prev = new;
32 new->next = next;
33 new->prev = prev;
34 prev->next = new;
35}
36EXPORT_SYMBOL(__list_add);
37
38void __list_del_entry(struct list_head *entry)
39{
40 struct list_head *prev, *next;
41
42 prev = entry->prev;
43 next = entry->next;
44
45 if (WARN(next == LIST_POISON1,
46 "list_del corruption, %p->next is LIST_POISON1 (%p)\n",
47 entry, LIST_POISON1) ||
48 WARN(prev == LIST_POISON2,
49 "list_del corruption, %p->prev is LIST_POISON2 (%p)\n",
50 entry, LIST_POISON2) ||
51 WARN(prev->next != entry,
52 "list_del corruption. prev->next should be %p, "
53 "but was %p\n", entry, prev->next) ||
54 WARN(next->prev != entry,
55 "list_del corruption. next->prev should be %p, "
56 "but was %p\n", entry, next->prev))
57 return;
58
59 __list_del(prev, next);
60}
61EXPORT_SYMBOL(__list_del_entry);
62
63/**
64 * list_del - deletes entry from list.
65 * @entry: the element to delete from the list.
66 * Note: list_empty on entry does not return true after this, the entry is
67 * in an undefined state.
68 */
69void list_del(struct list_head *entry)
70{
71 __list_del_entry(entry);
72 entry->next = LIST_POISON1;
73 entry->prev = LIST_POISON2;
74}
75EXPORT_SYMBOL(list_del);