From Manfred Spraul

A list_del debugging check.


---

 25-akpm/include/linux/list.h |    3 +++
 1 files changed, 3 insertions(+)

diff -puN include/linux/list.h~list_del-debug include/linux/list.h
--- 25/include/linux/list.h~list_del-debug	2004-04-05 18:46:59.874987800 -0700
+++ 25-akpm/include/linux/list.h	2004-04-05 18:46:59.877987344 -0700
@@ -158,8 +158,11 @@ static inline void __list_del(struct lis
  * Note: list_empty on entry does not return true after this, the entry is
  * in an undefined state.
  */
+#include <linux/kernel.h>	/* BUG_ON */
 static inline void list_del(struct list_head *entry)
 {
+	BUG_ON(entry->prev->next != entry);
+	BUG_ON(entry->next->prev != entry);
 	__list_del(entry->prev, entry->next);
 	entry->next = LIST_POISON1;
 	entry->prev = LIST_POISON2;

_