From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1756962AbbCGJSp (ORCPT <rfc822;w@1wt.eu>);
	Sat, 7 Mar 2015 04:18:45 -0500
Received: from mail-wi0-f170.google.com ([209.85.212.170]:35990 "EHLO
	mail-wi0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751777AbbCGJSl (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Sat, 7 Mar 2015 04:18:41 -0500
Date: Sat, 7 Mar 2015 10:18:35 +0100
From: Ingo Molnar <mingo@kernel.org>
To: John Stultz <john.stultz@linaro.org>
Cc: lkml <linux-kernel@vger.kernel.org>, Dave Jones <davej@codemonkey.org.uk>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Richard Cochran <richardcochran@gmail.com>,
        Prarit Bhargava <prarit@redhat.com>,
        Stephen Boyd <sboyd@codeaurora.org>,
        Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 03/12] clocksource: Remove clocksource_max_deferment()
Message-ID: <20150307091835.GA30888@gmail.com>
References: <1425696603-16878-1-git-send-email-john.stultz@linaro.org>
 <1425696603-16878-4-git-send-email-john.stultz@linaro.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1425696603-16878-4-git-send-email-john.stultz@linaro.org>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org


* John Stultz <john.stultz@linaro.org> wrote:

> clocksource_max_deferment() doesn't do anything useful
> anymore, so zap it.

Well, it does something useful, it encapsulates the max_deferment 
property of the clocksource:

> -static u64 clocksource_max_deferment(struct clocksource *cs)
> -{
> -	u64 max_nsecs;
> -
> -	max_nsecs = clocks_calc_max_nsecs(cs->mult, cs->shift, cs->maxadj,
> -					  cs->mask);
> -	return max_nsecs;
> -}

Which could be written in a shorter form, using:

static u64 clocksource_max_deferment(struct clocksource *cs)
{
	return clocks_calc_max_nsecs(cs->mult, cs->shift, cs->maxadj, cs->mask);
}

Which all allows short forms of:

	cs->max_idle_ns = clocksource_max_deferment(cs);

without writing out all the arguments.

Instead of that, you've introduced:

> +	cs->max_idle_ns = clocks_calc_max_nsecs(cs->mult, cs->shift,
> +						 cs->maxadj, cs->mask);

> +	cs->max_idle_ns = clocks_calc_max_nsecs(cs->mult, cs->shift,
> +						 cs->maxadj, cs->mask);

Which in the next patch gets even worse:


>  	cs->max_idle_ns = clocks_calc_max_nsecs(cs->mult, cs->shift,
> +						 cs->maxadj, cs->mask,
> +						 &cs->max_cycles);

>  	/* calculate max idle time permitted for this clocksource */
>  	cs->max_idle_ns = clocks_calc_max_nsecs(cs->mult, cs->shift,
> +						 cs->maxadj, cs->mask,
> +						 &cs->max_cycles);

While with the helper function it would still be the same sweet:

	cs->max_idle_ns = clocksource_max_deferment(cs);

So I don't think this cleanup is an improvement ...

Thanks,

	Ingo