xiaoxiang781216 commented on PR #6618:
URL: https://github.com/apache/incubator-nuttx/pull/6618#issuecomment-1185589820

   > What is the exact improvement? I see that loop has been moved from one 
place to other, so is removal of a semaphore improving performance?
   
   Since up_nputs can be replaced by chip vendor, they can provide the new 
implementation of up_nputs to gain the better performance. 


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