linux-kernel - Re: [PATCH] ntp:Fix second_overflow's input parameter type

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Message-ID: <CALAqxLX3xpVTP+Z3-ebKp9csfnkFmwh3G4k7Zt55d3r-StBhrQ@mail.gmail.com>
Date:	Tue, 15 Dec 2015 22:12:32 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	DengChao <chao.deng@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] ntp:Fix second_overflow's input parameter type

On Sat, Dec 12, 2015 at 8:26 PM, DengChao <chao.deng@...aro.org> wrote:
> The function "second_overflow" uses "unsign long"
> as its input parameter type which will overflow after
> year 2106 on 32bit systems.
> Replace it with time64_t type.
> Because 64-bit division is expensive, since "next_ntp_leap_sec"
> has been calculated already, we can just re-use it in the
> TIME_INS/DEL cases instead of re-doing divsion which may occur
> once a second.
> Signed-off-by: DengChao <chao.deng@...aro.org>

Queued for testing. I reworded the commit message a bit too.

thanks
-john
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