linux-kernel - Re: [RFC PATCH v3 0/5] y2038 in-kernel interface changes for drivers/rtc

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Message-ID: <alpine.DEB.2.11.1411181513040.3909@nanos>
Date:	Tue, 18 Nov 2014 15:13:32 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"pang.xunlei" <pang.xunlei@...aro.org>
cc:	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	John Stultz <john.stultz@...aro.org>,
	Arnd Bergmann <arnd.bergmann@...aro.org>
Subject: Re: [RFC PATCH v3 0/5] y2038 in-kernel interface changes for
 drivers/rtc

On Tue, 18 Nov 2014, pang.xunlei wrote:
> On 32bit systems, the kernel uses a 32bit signed time_t value
> for seconds since 1970-01-01:00:00:00. This will overflow at
> 2038-01-19 03:14:08, and is widely known as the y2038 problem.
> 
> To address this, the plan is to create 64bit internal interfaces
> which are 2038 safe, mark the unsafe versions as deprecated and 
> then convert subsystems one by one over to the new interfaces.
> Once all users are converted, the deprecated internal functions
> will be removed.
> 
> NOTE: In some cases, there are issues with 32bit values that are
> unsigned, and thus become y2106 issues. Since its somewhat simpler
> to unify the time types, we'll try to convert those usage to 64bit
> where it can be easily done. In those cases where a fix would be 
> overly complicated, we'll simply explicitly mark the limitation.
> 
> This patchset introduces the 64bit interfaces needed to convert
> the drivers/rtc subsystem, and to keep it relatively short some
> patches to demonstrate how the conversion will be done. If the 
> feedback is positive on this series, we'll provide the full 
> conversion series as well.

That looks way better than the last attempt.

Thanks,

	tglx
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