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Subject: Re: [PATCH] hrtimer: Remove overly verbose "switch to high res
 mode" message
From: Joe Perches <joe@perches.com>
To: Roland Dreier <rdreier@cisco.com>
Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
       linux-kernel@vger.kernel.org
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	 <20090924093800.GA23158@elte.hu>  <ada1vlw126s.fsf_-_@cisco.com>
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Date: Thu, 24 Sep 2009 14:12:44 -0700
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On Thu, 2009-09-24 at 14:07 -0700, Roland Dreier wrote:
> On big systems, printing <number of CPUs> copies of
>     Switched to high resolution mode on CPU nnn
> clutters up the kernel log for minimal gain.  Just get rid of them.
> Signed-off-by: Roland Dreier <rolandd@cisco.com>
> diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
> index e5d98ce..4267279 100644
> --- a/kernel/hrtimer.c
> +++ b/kernel/hrtimer.c
> @@ -720,8 +720,6 @@ static int hrtimer_switch_to_hres(void)
>  	/* "Retrigger" the interrupt to get things going */
>  	retrigger_next_event(NULL);
>  	local_irq_restore(flags);
> -	printk(KERN_DEBUG "Switched to high resolution mode on CPU %d\n",
> -	       smp_processor_id());

Perhaps pr_debug instead?
It gets compiled to nothing unless DEBUG is defined.