arch/s390/include/asm/timex.h:221: warning: expecting prototype for get_clock_monotonic(). Prototype was for get_tod_clock_monotonic() instead Error: Cannot open file drivers/ptp/ptp_s390.c arch/s390/include/asm/timex.h:222: warning: expecting prototype for get_clock_monotonic(). Prototype was for get_tod_clock_monotonic() instead