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H A Dkern_time.cdiff 45438 Wed Apr 07 17:48:09 MDT 1999 nsayer More secure clock management. Allow positive steps only once per second
for as much as one second, but no more. Allows a miscreant to
double-time march the clock, but no worse.

XXX Unlike putting negative deltas in a while(1), performing small
positive steps inside of a while(1) will return EPERM for the
unpermitted ones. Repeated negative deltas are clamped without
error (but the kernel does log a notice).

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