linux-kernel - Re: [patch 03/23] GTOD: persistent clock support, i386

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Date:	Mon, 02 Oct 2006 16:09:13 -0700
From:	john stultz <johnstul@...ibm.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Jim Gettys <jg@...top.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: [patch 03/23] GTOD: persistent clock support, i386

On Mon, 2006-10-02 at 15:44 -0700, Andrew Morton wrote:
> On Mon, 02 Oct 2006 15:03:37 -0700
> john stultz <johnstul@...ibm.com> wrote:
> 
> >  static int timer_resume(struct sys_device *dev)
> >  {
> > -	unsigned long flags;
> > -	unsigned long sec;
> > -	unsigned long ctime = get_cmos_time();
> > -	long sleep_length = (ctime - sleep_start) * HZ;
> > -	struct timespec ts;
> > -
> > -	if (sleep_length < 0) {
> > -		printk(KERN_WARNING "CMOS clock skew detected in timer resume!\n");
> > -		/* The time after the resume must not be earlier than the time
> > -		 * before the suspend or some nasty things will happen
> > -		 */
> > -		sleep_length = 0;
> > -		ctime = sleep_start;
> > -	}
> >  #ifdef CONFIG_HPET_TIMER
> >  	if (is_hpet_enabled())
> >  		hpet_reenable();
> >  #endif
> >  	setup_pit_timer();
> > -
> > -	sec = ctime + clock_cmos_diff;
> > -	ts.tv_sec = sec;
> > -	ts.tv_nsec = 0;
> > -	do_settimeofday(&ts);
> > -	write_seqlock_irqsave(&xtime_lock, flags);
> > -	jiffies_64 += sleep_length;
> > -	write_sequnlock_irqrestore(&xtime_lock, flags);
> >  	touch_softlockup_watchdog();
> >  	return 0;
> >  }
> 
> In this version of the patch, you no longer remove the
> touch_softlockup_watchdog() call from timer_resume().

Yea. That removal was added by Thomas, and I didn't merge it into my
tree. 

> But clockevents-drivers-for-i386.patch deletes timer_resume()
> altogether.
> 
> Hence we might need to put that re-added touch_softlockup_watchdog() call
> into somewhere else now.

Yea. While my dropping the change wasn't intentional, it seems the
change isn't really part of the persistent_clock changes, so the removal
should be done in one of the clockevents patches.

But I'll have to defer to tglx as to which one.

thanks
-john

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