linux-kernel - Re: [PATCHv7 16/16] pps: add parallel port PPS signal generator

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Message-Id: <20101223163549.86a73ae8.akpm@linux-foundation.org>
Date:	Thu, 23 Dec 2010 16:35:49 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alexander Gordeev <lasaine@....cs.msu.su>
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,
	john stultz <johnstul@...ibm.com>
Subject: Re: [PATCHv7 16/16] pps: add parallel port PPS signal generator

On Mon, 20 Dec 2010 14:54:56 +0300
Alexander Gordeev <lasaine@....cs.msu.su> wrote:

> +	expire_time = ktime_to_timespec(timer->_expires);

It's bad to play around with internal fields, especially when an
accessor API was provided to access those fields.

And lo, hrtimers got changed in linux-next:

drivers/pps/generators/pps_gen_parport.c: In function 'hrtimer_event':
drivers/pps/generators/pps_gen_parport.c:92: error: 'struct hrtimer' has no member named '_expires'

The documentation in hrtimer.h is of course complete crap and
Documentation/timers/hrtimers.txt appears to be bitrot, but with a little
sleuthing and guesswork, it seems that what you want here is



--- a/drivers/pps/generators/pps_gen_parport.c~pps-add-parallel-port-pps-signal-generator-fix
+++ a/drivers/pps/generators/pps_gen_parport.c
@@ -82,7 +82,7 @@ static enum hrtimer_restart hrtimer_even
 
 	/* first of all we get the time stamp... */
 	getnstimeofday(&ts1);
-	expire_time = ktime_to_timespec(timer->_expires);
+	expire_time = ktime_to_timespec(hrtimer_get_softexpires(timer));
 	dev = container_of(timer, struct pps_generator_pp, timer);
 	lim = NSEC_PER_SEC - send_delay - dev->port_write_time;
 
_

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