linux-kernel - Re: [Y2038] [PATCH 21/23] y2038: itimer: change implementation to timespec64

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Date:   Mon, 25 Nov 2019 21:26:23 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Ben Hutchings <ben.hutchings@...ethink.co.uk>
Cc:     y2038 Mailman List <y2038@...ts.linaro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>
Subject: Re: [Y2038] [PATCH 21/23] y2038: itimer: change implementation to timespec64

On Thu, Nov 21, 2019 at 5:52 PM Ben Hutchings
<ben.hutchings@...ethink.co.uk> wrote:
>
> On Fri, 2019-11-08 at 22:12 +0100, Arnd Bergmann wrote:
> [...]
> > @@ -292,8 +296,8 @@ static unsigned int alarm_setitimer(unsigned int seconds)
> >        * We can't return 0 if we have an alarm pending ...  And we'd
> >        * better return too much than too little anyway
> >        */
> > -     if ((!it_old.it_value.tv_sec && it_old.it_value.tv_usec) ||
> > -           it_old.it_value.tv_usec >= 500000)
> > +     if ((!it_old.it_value.tv_sec && it_old.it_value.tv_nsec) ||
> > +           it_old.it_value.tv_nsec >= 500000)
> [...]
>
> This is now off by a factor of 1000.  It might be helpful to use
> NSEC_PER_SEC / 2 here so no-one has to count the 0 digits.

Fixed now, thanks a lot for pointing it out!

        Arnd