linux-kernel - Re: [RFC PATCH v4 03/12] PM: Introduce an Energy Model management framework

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Message-ID: <20180705143901.GO2458@hirez.programming.kicks-ass.net>
Date:   Thu, 5 Jul 2018 16:39:01 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Quentin Perret <quentin.perret@....com>
Cc:     rjw@...ysocki.net, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, gregkh@...uxfoundation.org,
        mingo@...hat.com, dietmar.eggemann@....com,
        morten.rasmussen@....com, chris.redpath@....com,
        patrick.bellasi@....com, valentin.schneider@....com,
        vincent.guittot@...aro.org, thara.gopinath@...aro.org,
        viresh.kumar@...aro.org, tkjos@...gle.com, joel@...lfernandes.org,
        smuckle@...gle.com, adharmap@...cinc.com, skannan@...cinc.com,
        pkondeti@...eaurora.org, juri.lelli@...hat.com,
        edubezval@...il.com, srinivas.pandruvada@...ux.intel.com,
        currojerez@...eup.net, javi.merino@...nel.org
Subject: Re: [RFC PATCH v4 03/12] PM: Introduce an Energy Model management
 framework

On Thu, Jun 28, 2018 at 12:40:34PM +0100, Quentin Perret wrote:
> +/**
> + * em_fd_nr_cap_states() - Get the number of capacity states of a freq. domain
> + * @fd		: frequency domain for which want to do this
> + *
> + * Return: the number of capacity state in the frequency domain table
> + */
> +static inline int em_fd_nr_cap_states(struct em_freq_domain *fd)
> +{
> +	struct em_cs_table *table;
> +	int nr_states;
> +
> +	rcu_read_lock();
> +	table = rcu_dereference(fd->cs_table);
> +	nr_states = table->nr_cap_states;
> +	rcu_read_unlock();

So right here, we can continue to free @table...

> +
> +	return nr_states;
> +}

and then what does the value we return mean?