On Mon 27-11-17 15:26:54, jiang.biao2@xxxxxxxxxx wrote: > >> > With all due respect. I still think the robustness is more important than > > effectiveness in this case. :) > > This is a slow path so I wouldn't worry about the performance much. On > the other hand I agree that the API is well documented so adding a > warning is too defensive. We simply assume that the kernel running in > the kernel is reasonable. So I would say, fix your code. Ok, already send another patch for mbache shrinker to ensure non-minus return. Thank you for your reply :) Regards,