b_state_old      1437 fs/buffer.c    	unsigned long b_state, b_state_old;
b_state_old      1444 fs/buffer.c    		b_state_old = cmpxchg(&bh->b_state, b_state,
b_state_old      1446 fs/buffer.c    		if (b_state_old == b_state)
b_state_old      1448 fs/buffer.c    		b_state = b_state_old;