Powering Yun with an Uno

Base on Arduino Uno R3 documentation, it is safe to said Arduino Uno R3 Vout 5v pin supplies 5v when used (5.05 volt when I'm testing with a volt meter ).

Base on ATmega32u4 Data sheet, the operational voltage is 2.7~5.5 volt. So theoretically, this should be okay.

Question: Is it safe to directly connect Uno's 5v Pin to Yun's Vin Pin?

Arduino Uno R3 - Arduino Yun 5v Pin to Vin Pin Gnd Pin to Gnd Pin

Thank you! :)