Re: [PATCH v2] drm/msm: Use 64-bit timekeeping

[Tina Ruchandani]

>
> How about
>
>         remaining_jiffies = msecs_to_jiffies(ktime_ms_delta(*timeout, now));
>
> which only does one 64-bit division, and it's one that we can probably
> optimize out in the future (we can check in ktime_ms_delta whether the
> difference is more than 2^32 nanoseconds as the fast path).

Hi Arnd,
I had thought about that, but discard that approach being confused
about the truncation.
ktime_ms_delta returns s64 and msecs_to_jiffies will truncate that
input to int. However,
I now realize that for the msecs value to be greater than 32 bits, the
time delta has to be
>= ((2^29)/(60*60*24*365)) or >= 17 years. So your solution is safe.
If that sounds ok, I will send out a v3.