linux-kernel - Re: [RFC PATCH 04/19] cpufreq: bring data structures close to their locks

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Message-ID: <20160111220708.GK6344@twins.programming.kicks-ass.net>
Date:	Mon, 11 Jan 2016 23:07:09 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Juri Lelli <juri.lelli@....com>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	rjw@...ysocki.net, viresh.kumar@...aro.org,
	mturquette@...libre.com, steve.muckle@...aro.org,
	vincent.guittot@...aro.org, morten.rasmussen@....com,
	dietmar.eggemann@....com
Subject: Re: [RFC PATCH 04/19] cpufreq: bring data structures close to their
 locks

On Mon, Jan 11, 2016 at 05:35:45PM +0000, Juri Lelli wrote:
> +/**
> + * Iterate over governors
> + *
> + * cpufreq_governor_list is protected by cpufreq_governor_mutex.
> + */
> +static LIST_HEAD(cpufreq_governor_list);
> +static DEFINE_MUTEX(cpufreq_governor_mutex);
> +#define for_each_governor(__governor)				\
> +	list_for_each_entry(__governor, &cpufreq_governor_list, governor_list)

So you could stuff the lockdep_assert_held() you later add intididually
into the for_each_governor macro, impossible to forget that way.