linux-kernel - Re: [PATCH] clocksource: Avoid selecting mult values that might overflow when adjusted

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Message-ID: <20111103031049.GA13681@zhy>
Date:	Thu, 3 Nov 2011 11:10:49 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	David Daney <ddaney.cavm@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] clocksource: Avoid selecting mult values that might
 overflow when adjusted

On Wed, Nov 02, 2011 at 01:01:27PM -0700, John Stultz wrote:
> diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
> index 2b021b0e..d37c9e3 100644
> --- a/kernel/time/timekeeping.c
> +++ b/kernel/time/timekeeping.c
> @@ -820,6 +820,9 @@ static void timekeeping_adjust(s64 offset)
>  	} else
>  		return;
>  
> +	WARN_ONCE(timekeeper.mult+adj >
> +			timekeeper.clock->mult + timekeeper.clock->maxadj,
> +			"Adjusting more then 11%%");

			s/then/than ; s/%%/%\n ?

Thanks,
Yong
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