forward_bit      2231 kernel/locking/lockdep.c 	enum lock_usage_bit forward_bit = 0, backward_bit = 0;
forward_bit      2292 kernel/locking/lockdep.c 				   &backward_bit, &forward_bit);
forward_bit      2299 kernel/locking/lockdep.c 				 backward_bit, forward_bit,