linux-kernel - Re: [RESEND PATCH] rtc: Fix overflow when converting time64_t to rtc

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Message-ID: <CAK8P3a0HBYckf4eQUONg6yzai3emGYODAu6mTFpY+s6RUJ2NbA@mail.gmail.com>
Date:   Fri, 26 Jan 2018 10:24:46 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Mark Brown <broonie@...nel.org>, linux-rtc@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH] rtc: Fix overflow when converting time64_t to rtc_time

On Fri, Jan 26, 2018 at 6:06 AM, Baolin Wang <baolin.wang@...aro.org> wrote:
> If we convert one large time values to rtc_time, in the original formula
> 'days * 86400' can be overflowed in 'unsigned int' type to make the formula
> get one incorrect remain seconds value. Thus we can use div_s64_rem()
> function to avoid this situation.
>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>

Acked-by: Arnd Bergmann <arnd@...db.de>