linux-kernel - Re: [PATCH] timekeeping: handle epoch roll-over (2038) on 32-bit systems

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Message-ID: <loom.20130825T005015-983@post.gmane.org>
Date:	Sat, 24 Aug 2013 23:47:32 +0000 (UTC)
From:	Michael Gilbert <mgilbert@...ian.org>
To:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] timekeeping: handle epoch roll-over (2038) on 32-bit systems

Thomas Gleixner writes:
> That time value should be 64bit, also people might argue, that we are
> creating a new issue for the year 2554, i.e 541 years from now. I
> don't think we need to worry about that really. We have to leave our
> grand-grand-grand..grandchildren (~20 generations from now) a few
> unsolved problems!

Or at the measly cost of 8 additional bytes, solve the problem well and good 
for the entirety of the human race :)

128 (unsigned) bits defers the rollover problem for 1e-9*(2**128)/3600/24/365 
= 1e22 years, or 770 billion times longer than the current age of the 
universe.

That of course hedges on a 128-bit integer C standard within the next 25 
years ;)

Best wishes,
Mike

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