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 11:56:01 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	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 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.
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