Guarantee udelay(N) spins at least N microseconds

[Mason]

On 11/04/2015 14:10, Russell King - ARM Linux wrote:

> What this also means is that if you only have a 90kHz counter
> available, doing DVFS is also a stupid idea.

I must be missing something, because I don't see why DVFS
(i.e. saving energy when the system is idle) is a stupid
idea when only a 90 kHz counter is available?

What's the connection?