torture_onoff_init
int torture_onoff_init(long ooholdoff, long oointerval, torture_ofl_func *f);
firsterr = torture_onoff_init(onoff_holdoff * HZ,
firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval,
firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL);
EXPORT_SYMBOL_GPL(torture_onoff_init);