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Date:   Tue, 19 Jun 2018 13:31:06 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Quentin Perret <quentin.perret@arm.com>
Cc:     rjw@rjwysocki.net, gregkh@linuxfoundation.org,
        linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
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        morten.rasmussen@arm.com, chris.redpath@arm.com,
        patrick.bellasi@arm.com, valentin.schneider@arm.com,
        vincent.guittot@linaro.org, thara.gopinath@linaro.org,
        viresh.kumar@linaro.org, tkjos@google.com, joelaf@google.com,
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        pkondeti@codeaurora.org, juri.lelli@redhat.com,
        edubezval@gmail.com, srinivas.pandruvada@linux.intel.com,
        currojerez@riseup.net, javi.merino@kernel.org
Subject: Re: [RFC PATCH v3 03/10] PM: Introduce an Energy Model management
 framework
Message-ID: <20180619113106.GP2458@hirez.programming.kicks-ass.net>
References: <20180521142505.6522-1-quentin.perret@arm.com>
 <20180521142505.6522-4-quentin.perret@arm.com>
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On Mon, May 21, 2018 at 03:24:58PM +0100, Quentin Perret wrote:
> +	read_lock_irqsave(&em_data_lock, flags);
> +	for_each_cpu(cpu, cpu_possible_mask) {

I know we're likely to only use this on small systems, but this pattern
is a very bad, Please look at alternatives.