Re: [PATCH] hrtimer, add expiry time overflow check in hrtimer_interrupt

From: Li Zefan
Date: Wed Apr 24 2013 - 21:38:49 EST

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@xxxxxxxxxx>
>>>> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
>>>> Cc: John Stultz <john.stultz@xxxxxxxxxx>
>>> 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.

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