linux-kernel - Re: [PATCH] timekeeping: Limit system time to prevent 32-bit time

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Message-ID: <20151008062344.GO5778@localhost>
Date:	Thu, 8 Oct 2015 08:23:44 +0200
From:	Miroslav Lichvar <mlichvar@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, y2038@...ts.linaro.org,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Prarit Bhargava <prarit@...hat.com>,
	Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH] timekeeping: Limit system time to prevent 32-bit time_t
 overflow

On Wed, Oct 07, 2015 at 05:10:34PM +0200, Arnd Bergmann wrote:
> On Wednesday 07 October 2015 16:23:44 Miroslav Lichvar wrote:
> > Without the limit added by this patch make will go nuts just one week
> > later when the 32-bit time_t overflows to Dec 13 1901 and the files
> > will appear as 136 years in the future. How is that better?
> 
> Not better or worse at all, that was my point. The time is still
> wrong either way, whether you step back by a week or 136 years.

The difference is that with the one-week step the kernel and userspace
still agree on the current time and it is always valid from the kernel
point of view, absolute timers can be set, etc.

-- 
Miroslav Lichvar
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