Re: [PATCH 03/12] clocksource: Remove clocksource_max_deferment()

[Ingo Molnar <mingo@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