Quoting Linus himself (https://www.realworldtech.com/forum/?threadid=189711&curpostid=189959 https://www.realworldtech.com/forum/?threadid=189711&curpost...):

Quoting Linus himself (https://www.realworldtech.com/forum/?threadid=189711&curpostid=189959 https://www.realworldtech.com/forum/?threadid=189711&curpost...): > We didn't go out of our way to deliberately break anything. > But we do occasionally turn symbols that aren't meant to be used outside the kernel into GPL-only, because they have some internal implementation issues.