linux-kernel - Re: [PATCH] hrtimer, add expiry time overflow check in hrtimer

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Message-ID: <20130425044952.GA17412@roeck-us.net>
Date:	Wed, 24 Apr 2013 21:49:52 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Prarit Bhargava <prarit@...hat.com>,
	John Stultz <john.stultz@...aro.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	stable <stable@...r.kernel.org>
Subject: Re: [PATCH] hrtimer, add expiry time overflow check in
 hrtimer_interrupt

On Thu, Apr 25, 2013 at 09:38:22AM +0800, Li Zefan wrote:
> On 2013/4/25 6:42, Guenter Roeck wrote:
> > On Mon, Apr 08, 2013 at 04:34:26PM -0400, Prarit Bhargava wrote:
> >>
> >>
> >> On 04/08/2013 04:19 PM, John Stultz wrote:
> >>> On 04/08/2013 05:47 AM, Prarit Bhargava wrote:
> >>
> >>>>
> >>>> A simple check for an overflow can resolve this problem.  Using KTIME_MAX
> >>>> instead of the overflow value will result in the hrtimer function being run,
> >>>> and the reprogramming of the timer after that.
> >>>>
> >>>> Signed-off-by: Prarit Bhargava <prarit@...hat.com>
> >>>> Cc: Thomas Gleixner <tglx@...utronix.de>
> >>>> Cc: John Stultz <john.stultz@...aro.org>
> >>>
> >>> Prarit: Should this be tagged for -stable?
> >>
> >> John,
> >>
> >> Yes, this should go to -stable.  cc'd.
> >>
> > Hi,
> > 
> > I am a bit surprised that this patch has not found its way into mainline yet,
> > as everyone seems to agree that it is a candidate for -stable.
> > 
> > I hit this problem very reliably (ie with each boot) with 3.8.x on systems
> > which have no RTC and run systemd. Seen with Freescale P5040 as well as
> > a Broadcom MIPS based system.
> > 
> 
> FYI, we also hit this warning with 3.4-rt.
> 
You are lucky if it is just a warning for you. In my case the system is
reliably dead. Guess there are not (yet) many users out there using
systemd (or something similar) on a system with no RTC.

While I am not too happy about the delay to get the patch integrated,
I am glad that Prarit found and fixed the problem. Saved me a lot of time.

Guenter
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