linux-kernel - Re: [PATCH 8/9] hrtimer: Allow hrtimer::function() to free the timer

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Date:	Thu, 4 Jun 2015 12:07:41 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, umgwanakikbuti@...il.com,
	mingo@...e.hu, ktkhai@...allels.com, rostedt@...dmis.org,
	juri.lelli@...il.com, pang.xunlei@...aro.org, oleg@...hat.com,
	wanpeng.li@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/9] hrtimer: Allow hrtimer::function() to free the timer

On Thu, Jun 04, 2015 at 07:59:30AM +0200, Ingo Molnar wrote:

> > --- a/include/linux/hrtimer.h
> > +++ b/include/linux/hrtimer.h
> > @@ -123,8 +123,10 @@ struct hrtimer_sleeper {
> >  
> >  #ifdef CONFIG_64BIT
> >  # define HRTIMER_CLOCK_BASE_ALIGN	64
> > +# define __timer_base_running(timer)	timer->base->running
> >  #else
> >  # define HRTIMER_CLOCK_BASE_ALIGN	32
> > +# define __timer_base_running(timer)	timer->base->cpu_base->running
> >  #endif
> 
> Please put it into the cpu_base on 64-bit as well: the base pointer is available 
> already on 64-bit so there should be no measurable performance difference, and 
> readability is a primary concern with all this code.

That's an extra pointer chase for no reason :-(
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