Linus has addressed so called "professionalism" several times, one of the best discussions is here: https://lkml.org/lkml/2013/7/15/427; https://lkml.org/lkml/2

Linus has addressed so called "professionalism" several times, one of the best discussions is here: https://lkml.org/lkml/2013/7/15/427; https://lkml.org/lkml/2013/7/15/427; Linus's point of view on overall "professionalism": https://lkml.org/lkml/2013/7/15/547 https://lkml.org/lkml/2013/7/15/547