Which type to use for timestamps: u64 or s64?

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Hi Arnd,

We're redesigning the timestamp handling in the video4linux subsystem moving away
from struct timeval to a single timestamp in ns (what ktime_get_ns() gives us).
But I was wondering: ktime_get_ns() gives a s64, so should we use s64 as well as
the timestamp type we'll eventually be returning to the user, or should we use u64?

The current patch series we made uses a u64, but I am now beginning to doubt that
decision.

Regards,

	Hans
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