>
> #define DIV_ROUND_DOWN_ULL(ll, d) \
> ????({ unsigned long long _tmp = (ll); do_div(_tmp, d); _tmp; })
>
> #define DIV_ROUND_UP_ULL(ll, d)??????? DIV_ROUND_DOWN_ULL((ll) + (d) -
> 1, (d))
>
>
> It uses intermediate unsigned long long _tmp for your "multiply", namely
> MSEC_PER_SEC * drto_clks * drto_div, which could solves the problem.
> So I don't see why DIV_ROUND_UP_ULL can't work for you?
Take back. I misunderstood your "multiply", sorry.
>
>
>> ????? /* add a bit spare time */
>>
>
>
>
