linux-kernel - Re: [patch 4/7] clockevents: Provide combined configure and register function

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Message-ID: <alpine.LFD.2.02.1105191155170.3078@ionos>
Date:	Thu, 19 May 2011 12:00:13 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ingo Molnar <mingo@...e.hu>
cc:	LKML <linux-kernel@...r.kernel.org>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [patch 4/7] clockevents: Provide combined configure and register
 function

On Thu, 19 May 2011, Ingo Molnar wrote:

> 
> * Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> > +extern void clockevents_config_and_register(struct clock_event_device *dev,
> > +					    u32 freq, unsigned long min_delta,
> > +					    unsigned long max_delta);
> 
> might be worth collecting these fields into a clocksource_params structure:
> 
> struct clocksource_params {
> 	u32		freq;
> 	unsigned long	min_delta;
> 	unsigned long	max_delta;
> };
> 
> That way the initialization API looks even more streamlined:
> 
> extern void
> clockevents_config_and_register(struct clock_event_device *dev,
> 				struct clocksource_params params);
> 
> and could be extended in the future, without having to update every single 
> clocksource driver again.

Though it's unlikely that we have more params int the foreseeable
future and it's more code in the clock events registration sites as
you have to do:

    struct param par;

    par.freq = f;
    par.min_delta = x;
    par.max_delta = y;
    clockevents_config_and_register(&dev, &p);

instead of having a single line.

When the need arises we still can do

__clockevents_config_and_register(struct clock_event_device *dev,
   	                          struct clocksource_params params);

and have the current function as a wrapper around it.

Thanks,

	tglx
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