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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Wed, 18 Jul 2018 13:36:52 +0200
Message-ID: <CAMuHMdXHUwbD4ZBuQz-xYQO=QdYdPS=j=oLWBet6B7PrGEkT9Q@mail.gmail.com>
Subject: Re: [PATCH 2/3] [v2] m68k: mac: use time64_t in RTC handling
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Joshua Thompson <funaho@jurai.org>,
        Mathieu Malaterre <malat@debian.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Greg Ungerer <gerg@linux-m68k.org>,
        linux-m68k <linux-m68k@lists.linux-m68k.org>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        y2038 Mailman List <y2038@lists.linaro.org>,
        Meelis Roos <mroos@linux.ee>,
        Andreas Schwab <schwab@linux-m68k.org>
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On Tue, Jun 19, 2018 at 4:04 PM Arnd Bergmann <arnd@arndb.de> wrote:
> The real-time clock on m68k (and powerpc) mac systems uses an unsigned
> 32-bit value starting in 1904, which overflows in 2040, about two years
> later than everyone else, but this gets wrapped around in the Linux
> code in 2038 already because of the deprecated usage of time_t and/or
> long in the conversion.
>
> Getting rid of the deprecated interfaces makes it work until 2040 as
> documented, and it could be easily extended by reinterpreting
> the resulting time64_t as a positive number. For the moment, I'm
> adding a WARN_ON() that triggers if we encounter a time before 1970
> or after 2040 (the two are indistinguishable).
>
> This brings it in line with the corresponding code that we have on
> powerpc macintosh.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Thanks for your patch!

Applied and queued for v4.19, with the WARN_ON() dropped.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds