linux-kernel - Re: [take12 0/3] kevent: Generic event handling mechanism.

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Message-ID: <p73pser7ozn.fsf@verdi.suse.de>
Date:	23 Aug 2006 11:58:20 +0200
From:	Andi Kleen <ak@...e.de>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Jari Sundell <sundell.software@...il.com>,
	David Miller <davem@...emloft.net>, kuznet@....inr.ac.ru,
	nmiell@...cast.net, linux-kernel@...r.kernel.org,
	drepper@...hat.com, netdev@...r.kernel.org, zach.brown@...cle.com,
	hch@...radead.org
Subject: Re: [take12 0/3] kevent: Generic event handling mechanism.

Evgeniy Polyakov <johnpol@....mipt.ru> writes:
> 
> Let's then place there a structure with 64bit seconds and nanoseconds,
> similar to timspec, but without longs there.

You need 64bit (or at least more than 32bit) for the seconds,
otherwise you add a y2038 problem which would be sad in new code.
Remember you might be still alive then ;-)

Ok one could argue that on 32bit architectures 2038 is so deeply
embedded that it doesn't make much difference, but I still
think it would be better to not readd it to new interfaces there.

64bit longs on 32bit is fine, as long as you use aligned_u64,
never long long or u64 (which has varying alignment between i386 and x86-64)

-Andi
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