linux-kernel - Re: [PATCH 3/5] perf/arm-ccn: Fix CPU hotplug race avoidance

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Message-ID: <alpine.DEB.2.21.1902102143290.8784@nanos.tec.linutronix.de>
Date:   Sun, 10 Feb 2019 21:44:06 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Robin Murphy <robin.murphy@....com>
cc:     will.deacon@....com, mark.rutland@....com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        suzuki.poulose@....com, peterz@...radead.org, bigeasy@...utronix.de
Subject: Re: [PATCH 3/5] perf/arm-ccn: Fix CPU hotplug race avoidance

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