itcw_calc_size
size_t itcw_calc_size(int intrg, int max_tidaws, int intrg_max_tidaws);
itcw_size = itcw_calc_size(0, count, 0);
itcw_size = itcw_calc_size(0, ctidaw, 0);
EXPORT_SYMBOL(itcw_calc_size);