forward_mask 2230 kernel/locking/lockdep.c unsigned long usage_mask = 0, forward_mask, backward_mask; forward_mask 2258 kernel/locking/lockdep.c forward_mask = exclusive_mask(usage_mask); forward_mask 2263 kernel/locking/lockdep.c ret = find_usage_forwards(&that, forward_mask, &target_entry1);