linux-kernel - Re: [stable] [patch 3/3] rtc: Limit frequency

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Message-ID: <20110722223915.GA22405@1wt.eu>
Date:	Sat, 23 Jul 2011 00:39:15 +0200
From:	Willy Tarreau <w@....eu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ben Greear <greearb@...delatech.com>,
	Ingo Molnar <mingo@...e.hu>,
	John Stultz <john.stultz@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>, stable@...nel.org
Subject: Re: [stable] [patch 3/3] rtc: Limit frequency

On Fri, Jul 22, 2011 at 03:05:50PM -0700, Andrew Morton wrote:
> On Fri, 22 Jul 2011 09:12:51 -0000
> Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> > The RTC hrtimer is self rearming. We really need to limit the
> > frequency to something sensible.
> 
> > Cc: stable@...nel.org
> 
> Why?  What failures does the current code cause?  What effect do these
> failures have upon users?

I would add that if we go that route, we should at least accept values
that were documented as possible till now. Man rtc says 2 Hz to 8192 Hz,
but Thomas' proposed patch limits it to 5000 Hz, so some breakage is to
be expected.

Regards,
Willy

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