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| author | Chris Metcalf <cmetcalf@tilera.com> | 2012-05-29 15:07:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-29 16:22:32 -0700 |
| commit | 17a801f4bfeb8d55df1b05fa7adb16ada504e765 (patch) | |
| tree | 7aa3a8683c48ff5d5c5fd987f0edbc34171ddb7e /lib/list_debug.c | |
| parent | 401dea7f7ade662b77c33ce2498fb5b4f97cb29c (diff) | |
| download | lwn-17a801f4bfeb8d55df1b05fa7adb16ada504e765.tar.gz lwn-17a801f4bfeb8d55df1b05fa7adb16ada504e765.zip | |
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@tilera.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/list_debug.c')
| -rw-r--r-- | lib/list_debug.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/list_debug.c b/lib/list_debug.c index 3810b481f940..23a5e031cd8b 100644 --- a/lib/list_debug.c +++ b/lib/list_debug.c @@ -31,6 +31,9 @@ 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; |