because udelay work on the principle that it know "how much work the
cpu can do in a time" and it work by just doing a loop of nothing, how
stable is it when the cpu clock rate is keep changing all the time?
does it update its loops_per_jiffy varible each time the cpu clock is change?
or does it have another solution to this problem?
or since before the cpu enter to this udelay function it must do some
work like entering the systemcall and so on , the cpu clock rate is
jump to the original?
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