linux-kernel - Re: RFC: [PATCH] clocksource: tcb: fix min

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Date:	Tue, 23 Apr 2013 21:44:50 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Andres Salomon <dilinger@...ued.net>, <arm@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: Re: RFC: [PATCH] clocksource: tcb: fix min_delta calculation

On Tue, Apr 23, 2013 at 03:11:33PM +0200, Marc Kleine-Budde wrote:
> On 04/23/2013 03:08 PM, Marc Kleine-Budde wrote:
> > The commit
> > 
> >     77cc982 clocksource: use clockevents_config_and_register() where possible
> > 
> > switches from manually calculating min_delta_ns (and others) and
> > clockevents_register_device() to automatic calculation via
> > clockevents_config_and_register(). During this conversation the "+ 1" in
> > 
> >     min_delta_ns = clockevent_delta2ns(1, &clkevt.clkevt) + 1;
> > 
> > was lost. This leads to problems with schedule_delayed_work() with a delay of
> > "1". Resulting in the work not scheduled in time.
> > 
> > This patch fixes the problem by increasing the min_delta to "2" ticks.
> > 
> > Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
> 
> The problem appears on at91sam9263. This patch successfully fixes the
> problem and applies to current linus/master (post v3.9-rc8).

Thanks for the fixing, Marc.

Acked-by: Shawn Guo <shawn.guo@...aro.org>

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