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Date: Mon, 26 Mar 2012 16:46:55 -0400 From: Chris Metcalf <cmetcalf@...era.com> To: linux-kernel@...r.kernel.org Subject: [PATCH] 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@...era.com> --- 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 b8029a5..ee41bd2 100644 --- a/lib/list_debug.c +++ b/lib/list_debug.c @@ -28,6 +28,9 @@ 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; -- 1.6.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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