linux-kernel - Re: [patch 5/8] ntp: Make the RTC synchronization more reliable

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Message-ID: <CAMuHMdXQvPY_mYicjPKjDSCwdO_rP-9PJOvqD0J6=S3Opr1ycg@mail.gmail.com>
Date:   Mon, 11 Jan 2021 11:40:29 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        John Stultz <john.stultz@...aro.org>,
        Prarit Bhargava <prarit@...hat.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        linux-rtc@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [patch 5/8] ntp: Make the RTC synchronization more reliable

Hi Thomas,

On Mon, Jan 11, 2021 at 11:12 AM Thomas Gleixner <tglx@...utronix.de> wrote:
> On Tue, Dec 29 2020 at 20:41, Geert Uytterhoeven wrote:
> >> Reported-by: Miroslav Lichvar <mlichvar@...hat.com>
> >> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> >
> > Thanks for your patch, which is now commit c9e6189fb03123a7 ("ntp: Make
> > the RTC synchronization more reliable").
> >
> > Since this commit, the I2C RTC on the R-Car M2-W Koelsch development
> > board is accessed every two seconds.  Sticking a WARN() in the I2C
> > activation path gives e.g.
>
> Huch? Every two seconds? The timer is armed with 11 * 60 * NSEC_PER_SEC,
> which is 11 minutes. Confused....

Thanks for the hint:

    #define SYNC_PERIOD_NS (11UL * 60 * NSEC_PER_SEC)

is truncated on 32-bit platforms.

Patch sent.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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