7aa3a8683c48ff5d5c5fd987f0edbc34171ddb7e
parent 401dea7f7ade662b77c33ce2498fb5b4f97cb29c
author Chris Metcalf <cmetcalf@tilera.com> 1338329251 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1338333752 -0700

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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