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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>
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@ -31,6 +31,9 @@ void __list_add(struct list_head *new,
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"list_add corruption. prev->next should be "
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"next (%p), but was %p. (prev=%p).\n",
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next, prev->next, prev);
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WARN(new == prev || new == next,
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"list_add double add: new=%p, prev=%p, next=%p.\n",
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new, prev, next);
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next->prev = new;
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new->next = next;
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new->prev = prev;
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