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SubjectRe: jiffies rollover, uptime etc.
> I wonder, is it more expensive to write all drivers to handle the
> wraps than to take the long long increment hit? The increment is

Total cost of handling it right - 0 clocks. Its simply about maths order
and sign

> Maybe the non-atomicity of the long long increment is the problem?

A big one yes.

> Does this problem still exist on 64-bit machines?

Not in the same way - you'll need a lot of years before you worry about it.
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