Root/lib/list_debug.c

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
38/**
39 * 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{
46    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);
52    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);
58    __list_del(entry->prev, entry->next);
59    entry->next = LIST_POISON1;
60    entry->prev = LIST_POISON2;
61}
62EXPORT_SYMBOL(list_del);
63

Archive Download this file



interactive