The patch titled
Subject: list_debug: WARN for adding something already in the list
has been added to the -mm tree. Its filename is
list_debug-warn-for-adding-something-already-in-the-list.patch
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------------------------------------------------------
From: Chris Metcalf <cmetcalf@xxxxxxxxxx>
Subject: list_debug: WARN for adding something already in the list
We were bitten by this at one point and added an additional sanity test
for DEBUG_LIST. You can't validly add a list_head to a list where either
prev or next is the same as the thing you're adding.
Signed-off-by: Chris Metcalf <cmetcalf@xxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/list_debug.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN lib/list_debug.c~list_debug-warn-for-adding-something-already-in-the-list lib/list_debug.c
--- a/lib/list_debug.c~list_debug-warn-for-adding-something-already-in-the-list
+++ a/lib/list_debug.c
@@ -30,6 +30,9 @@ void __list_add(struct list_head *new,
"list_add corruption. prev->next should be "
"next (%p), but was %p. (prev=%p).\n",
next, prev->next, prev);
+ WARN(new == prev || new == next,
+ "list_add double add: new=%p, prev=%p, next=%p.\n",
+ new, prev, next);
next->prev = new;
new->next = next;
new->prev = prev;
_
Subject: Subject: list_debug: WARN for adding something already in the list
Patches currently in -mm which might be from cmetcalf@xxxxxxxxxx are
origin.patch
linux-next.patch
list_debug-warn-for-adding-something-already-in-the-list.patch
c-r-ipc-message-queue-receive-cleanup.patch
c-r-ipc-message-queue-stealing-feature-introduced.patch
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