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Date: Wed, 26 Oct 2016 19:57:11 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Fenghua Yu <fenghua.yu@intel.com>
cc: "H. Peter Anvin" <h.peter.anvin@intel.com>,
        Ingo Molnar <mingo@elte.hu>, Tony Luck <tony.luck@intel.com>,
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        Dave Hansen <dave.hansen@intel.com>,
        Nilay Vaish <nilayvaish@gmail.com>, Shaohua Li <shli@fb.com>,
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        Ravi V Shankar <ravi.v.shankar@intel.com>,
        Sai Prakhya <sai.praneeth.prakhya@intel.com>,
        Vikas Shivappa <vikas.shivappa@linux.intel.com>,
        linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
Subject: Re: [PATCH v5 14/18] x86/intel_rdt: Add cpus file
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On Sat, 22 Oct 2016, Fenghua Yu wrote:
> @@ -323,8 +325,11 @@ static int intel_rdt_online_cpu(unsigned int cpu)
>  	struct rdt_resource *r;
>  
>  	mutex_lock(&rdtgroup_mutex);
> +	per_cpu(cpu_closid, cpu) = 0;
>  	for_each_capable_rdt_resource(r)
>  		domain_add_cpu(cpu, r);
> +	/* The cpu is set in default rdtgroup after online. */
> +	cpumask_set_cpu(cpu, &rdtgroup_default.cpu_mask);
>  	state->closid = 0;
>  	wrmsr(MSR_IA32_PQR_ASSOC, state->rmid, 0);
>  	mutex_unlock(&rdtgroup_mutex);
> @@ -334,11 +339,16 @@ static int intel_rdt_online_cpu(unsigned int cpu)
>  
>  static int intel_rdt_offline_cpu(unsigned int cpu)
>  {
> +	struct rdtgroup *rdtgrp;
>  	struct rdt_resource *r;
>  
>  	mutex_lock(&rdtgroup_mutex);
>  	for_each_capable_rdt_resource(r)
>  		domain_remove_cpu(cpu, r);
> +	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
> +		if (cpumask_test_and_clear_cpu(cpu, &rdtgrp->cpu_mask))
> +			break;
> +	}

I think we should set cpu_closid to 0 here and cleanup the per cpu state /
MSR as well.

Thanks,

	tglx