https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70749
--- Comment #2 from ktkachov at gcc dot gnu.org --- Trunk errors with or without optimisation. GCC 5 and earlier don't error with optimisation. If this behaviour is expected (and the bug is in the kernel sources) feel free to close the report. I just thought it curious that the error depends on optimisation level.
