Re: [RFC PATCH v3 0/5] y2038 in-kernel interface changes for drivers/rtc
From: Thomas Gleixner
Date: Tue Nov 18 2014 - 09:13:40 EST
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.
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