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

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Date:	Wed, 19 Nov 2014 21:41:36 +0800
From:	"pang.xunlei" <pang.xunlei@...aro.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"rtc-linux@...glegroups.com" <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 18 November 2014 22:13, Thomas Gleixner <tglx@...utronix.de> wrote:
> 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.
Hi Thomas,

Thanks for your affirmation and former suggestions. I'll send the
another succeeding patchset later.

Regards,
Xunlei
>
> Thanks,
>
>         tglx
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