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

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Message-ID: <CALAqxLU+cGJyLaDVucCcL1V_WxzC6sKmy8XBHSMgXdeWjWStMA@mail.gmail.com>
Date:	Wed, 19 Nov 2014 15:53:40 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	"pang.xunlei" <pang.xunlei@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Arnd Bergmann <arnd.bergmann@...aro.org>
Subject: Re: [RFC PATCH v3 0/5] y2038 in-kernel interface changes for drivers/rtc

On Tue, Nov 18, 2014 at 3:15 AM, pang.xunlei <pang.xunlei@...aro.org> 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.
>
> pang.xunlei (5):
>   time: Provide y2038 safe do_settimeofday() replacement
>   time: Provide y2038 safe timekeeping_inject_sleeptime() replacement
>   time: Provide y2038 safe mktime() replacement
>   rtc/lib: Provide y2038 safe rtc_tm_to_time()/rtc_time_to_tm()
>     replacement
>   rtc/mc13xxx: Eliminate time problems

Ok, I've queued these up for testing in my tree. Hope to send them off
to Thomas for 3.19.

thanks
-john
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