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[PATCH] list_del debug check

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A list_del() debugging check.  Has been in -mm for years.  Dave moved
list_del() out-of-line in the debug case, so this is now suitable for
mainline.

Cc: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Manfred Spraul 2006-09-29 01:59:01 -07:00 committed by Linus Torvalds
parent 199a9afc3d
commit df89a86463
1 changed files with 7 additions and 5 deletions
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12
lib/list_debug.c
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@ -59,14 +59,17 @@ EXPORT_SYMBOL(list_add);
*/ */
void list_del(struct list_head *entry) void list_del(struct list_head *entry)
{ {
BUG_ON(entry->prev->next != entry);
BUG_ON(entry->next->prev != entry);
if (unlikely(entry->prev->next != entry)) { if (unlikely(entry->prev->next != entry)) {
printk(KERN_ERR "list_del corruption. prev->next should be %p, but was %p\n", printk(KERN_ERR "list_del corruption. prev->next should be %p, "
entry, entry->prev->next); "but was %p\n", entry, entry->prev->next);
BUG(); BUG();
} }
if (unlikely(entry->next->prev != entry)) { if (unlikely(entry->next->prev != entry)) {
printk(KERN_ERR "list_del corruption. next->prev should be %p, but was %p\n", printk(KERN_ERR "list_del corruption. next->prev should be %p, "
entry, entry->next->prev); "but was %p\n", entry, entry->next->prev);
BUG(); BUG();
} }
__list_del(entry->prev, entry->next); __list_del(entry->prev, entry->next);
@ -74,4 +77,3 @@ void list_del(struct list_head *entry)
entry->prev = LIST_POISON2; entry->prev = LIST_POISON2;
} }
EXPORT_SYMBOL(list_del); EXPORT_SYMBOL(list_del);