linux-kernel - Re: [RFCv5 PATCH 16/46] sched: Allocate and initialize energy data structures

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Date:	Wed, 12 Aug 2015 12:04:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Morten Rasmussen <morten.rasmussen@....com>
Cc:	mingo@...hat.com, vincent.guittot@...aro.org,
	daniel.lezcano@...aro.org,
	Dietmar Eggemann <Dietmar.Eggemann@....com>,
	yuyang.du@...el.com, mturquette@...libre.com, rjw@...ysocki.net,
	Juri Lelli <Juri.Lelli@....com>, sgurrappadi@...dia.com,
	pang.xunlei@....com.cn, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [RFCv5 PATCH 16/46] sched: Allocate and initialize energy data
 structures

On Tue, Jul 07, 2015 at 07:23:59PM +0100, Morten Rasmussen wrote:
> +
> +	sge->nr_idle_states = fn(cpu)->nr_idle_states;
> +	sge->nr_cap_states = fn(cpu)->nr_cap_states;
> +	memcpy(sge->idle_states, fn(cpu)->idle_states,
> +	       sge->nr_idle_states*sizeof(struct idle_state));
> +	memcpy(sge->cap_states, fn(cpu)->cap_states,
> +	       sge->nr_cap_states*sizeof(struct capacity_state));

> +			if (fn && fn(j)) {
> +				nr_idle_states = fn(j)->nr_idle_states;
> +				nr_cap_states = fn(j)->nr_cap_states;
> +				BUG_ON(!nr_idle_states || !nr_cap_states);
> +			}

> +	for_each_cpu(i, &mask) {
> +		int y;
> +
> +		BUG_ON(fn(i)->nr_idle_states != fn(cpu)->nr_idle_states);
> +
> +		for (y = 0; y < (fn(i)->nr_idle_states); y++) {
> +			BUG_ON(fn(i)->idle_states[y].power !=
> +					fn(cpu)->idle_states[y].power);
> +		}
> +
> +		BUG_ON(fn(i)->nr_cap_states != fn(cpu)->nr_cap_states);
> +
> +		for (y = 0; y < (fn(i)->nr_cap_states); y++) {
> +			BUG_ON(fn(i)->cap_states[y].cap !=
> +					fn(cpu)->cap_states[y].cap);
> +			BUG_ON(fn(i)->cap_states[y].power !=
> +					fn(cpu)->cap_states[y].power);
> +		}
> +	}
> +}

Might it not make more sense to have:

	const struct blah *const blah = fn();

and use blah afterwards, instead of the repeated invocation of fn()?
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