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Date:   Sun, 10 Feb 2019 21:44:06 +0100 (CET)
From:   Thomas Gleixner <tglx@linutronix.de>
To:     Robin Murphy <robin.murphy@arm.com>
cc:     will.deacon@arm.com, mark.rutland@arm.com,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        suzuki.poulose@arm.com, peterz@infradead.org, bigeasy@linutronix.de
Subject: Re: [PATCH 3/5] perf/arm-ccn: Fix CPU hotplug race avoidance
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References: <cover.1549299188.git.robin.murphy@arm.com> <d1118e5694694ee40d2e784b2af8745f2d1dce0a.1549299188.git.robin.murphy@arm.com>
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On Mon, 4 Feb 2019, Robin Murphy wrote:
>  	/* Pick one CPU which we will use to collect data from CCN... */
> -	cpumask_set_cpu(get_cpu(), &ccn->dt.cpu);
> +	cpus_read_lock();
> +	ccn->dt.cpu = smp_processor_id();

Again raw_smp_processor_id()

Thanks,

	tglx