Root/lib/list_debug.c

Source at commit b386be689295730688885552666ea40b2e639b14 created 8 years 11 months ago.
By Maarten ter Huurne, Revert "MIPS: JZ4740: reset: Initialize hibernate wakeup counters."
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);
76

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