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SubjectRe: [PATCH] timekeeping: handle epoch roll-over (2038) on 32-bit systems

* Thomas Gleixner <tglx@linutronix.de> wrote:

> On Mon, 3 Jun 2013, John Stultz wrote:
> > On 06/03/2013 07:34 AM, Thomas Gleixner wrote:
> > > Though even if we fix that we still need to twist our brains around
> > > the timespec/timeval based user space interfaces. That's going to be
> > > the way more interesting challenge.
> >
> > I'm curious if there are any there other ideas that folks are considering?
>
> Honestly, we have almost 25 years ahead of us to solve that. So why
> hurry? If Tobias thinks that his embedded system of today needs to
> survive 2038 without updating the kernel and all of userspace, then
> all I can do is wish him good luck. Albeit we should not waste 25
> years and run into another Y2K horror. :)
>
> The only solid solution is to implement a new set of syscalls (and
> there are not that many which are affected by this). The new syscalls
> should use a nanosecond based scalar time value and get rid of the
> timespec /timeval / time_t nonsense alltogether. That reduces the
> number of new syscalls significantly.
>
> That time value should be 64bit, also people might argue, that we are
> creating a new issue for the year 2554, i.e 541 years from now. I
> don't think we need to worry about that really. We have to leave our
> grand-grand-grand..grandchildren (~20 generations from now) a few
> unsolved problems!
>
> The evil plan to make this happen looks like this:
>
> 1) Convert the core code to u64 with a timespec based shadow
> infrastruture to avoid performance regressions in the first
> place.
>
> 2) Add new u64 based syscalls
>
> 3) Disable the timespec based shadow infrastructure five years
> from now to force all lazy buggers who ignored the new syscalls
> to fix their crap.
>
> 4) Deprecate the old syscalls 10 years from now
>
> 5) Remove the old syscalls 100 years from now so Linus won't hunt
> us for breaking userspace :)

50 years from now should be enough for most of us - beyond that there will
be no hunting, only haunting ... ;-)

Thanks,

Ingo


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