Author: Julia Lawall <julia@diku.dk> if (…) BUG(); should be replaced with BUG_ON(…) when the test has no side-effects to allow a definition of BUG_ON that drops the code completely. The semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // @ disable unlikely @ expression E,f; @@ ( if () { BUG(); } | …