linux-kernel - Re: [PATCHv6 16/16] pps: add parallel port PPS signal generator

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Message-ID: <20101218035239.11d59828@apollo.gnet>
Date:	Sat, 18 Dec 2010 03:52:39 +0300
From:	Alexander Gordeev <lasaine@....cs.msu.su>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	"Nikita V\. Youshchenko" <yoush@...msu.su>,
	linuxpps@...enneenne.com, Rodolfo Giometti <giometti@...eenne.com>,
	Randy Dunlap <rdunlap@...otime.net>, linux-doc@...r.kernel.org
Subject: Re: [PATCHv6 16/16] pps: add parallel port PPS signal generator

В Fri, 17 Dec 2010 16:18:37 -0800
Andrew Morton <akpm@...ux-foundation.org> пишет:

> On Fri, 17 Dec 2010 22:54:40 +0300
> Alexander Gordeev <lasaine@....cs.msu.su> wrote:
> 
> > +static enum hrtimer_restart hrtimer_event(struct hrtimer *timer)
> > +{
> > +	struct timespec expire_time, ts1, ts2, ts3, dts;
> > +	struct pps_generator_pp *dev;
> > +	struct parport *port;
> > +	long lim, delta;
> > +	unsigned long flags;
> > +
> > +	/* NB: approx time with blocked interrupts =
> > +	   send_delay + 3 * SAFETY_INTERVAL */
> > +	local_irq_save(flags);
> 
> ditto.

The same thing here: we don't want random lags due to other local
interrupt handlers.

-- 
  Alexander

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