linux-kernel - Re: [PATCH 1/2] hrtimer: correct a few numbers in comments and printk outputs

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Date:	Wed, 25 Nov 2009 21:18:39 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Luming Yu <luming.yu@...il.com>
Subject: Re: [PATCH 1/2] hrtimer: correct a few numbers in comments and printk
 outputs

On Wed, 25 Nov 2009, Andrew Morton wrote:

> On Tue, 24 Nov 2009 11:14:03 +0100
> Uwe Kleine-K__nig  <u.kleine-koenig@...gutronix.de> wrote:
> 
> > Hello Andrew,
> > 
> > On Mon, Nov 23, 2009 at 03:25:16PM -0800, Andrew Morton wrote:
> > > On Fri, 20 Nov 2009 20:23:39 +0100
> > > Uwe Kleine-K__nig  <u.kleine-koenig@...gutronix.de> wrote:
> > > 
> > > > @@ -52,7 +52,7 @@ int tick_dev_program_event(struct clock_event_device *dev, ktime_t expires,
> > > >  			printk(KERN_WARNING
> > > >  			       "CE: %s increasing min_delta_ns to %lu nsec\n",
> > > >  			       dev->name ? dev->name : "?",
> > > > -			       dev->min_delta_ns << 1);
> > > > +			       dev->min_delta_ns);
> > > >  
> > > >  			i = 0;
> > > >  		}
> > > 
> > > This one's already in linux-next:
> > > 
> > > @@ -50,9 +50,9 @@ int tick_dev_program_event(struct clock_
> > >  				dev->min_delta_ns += dev->min_delta_ns >> 1;
> > >  
> > >  			printk(KERN_WARNING
> > > -			       "CE: %s increasing min_delta_ns to %lu nsec\n",
> > > +			       "CE: %s increasing min_delta_ns to %llu nsec\n",
> > >  			       dev->name ? dev->name : "?",
> > > -			       dev->min_delta_ns << 1);
> > > +			       (unsigned long long) dev->min_delta_ns << 1);
> > '<< 1' is wrong here, too.
> > 
> 
> What's wrong with it?  That leftshift appears to be to compensate for
> the rightshift a few lines above.
> 
> That change was unobvious and unchangelogged, so here we are again.

That's actually my fault. In commit 61c22c34 I removed the WARN_ON
which we put there to gather data on kerneloops.org for a while and
did not fix the printk format string.

Will take care of it. Thanks,

     tglx
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