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Date: Tue, 15 Nov 2016 14:35:50 +0100 (CET)
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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        Vikas Shivappa <vikas.shivappa@linux.intel.com>,
        linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
Subject: Re: [PATCH 2/3] x86/intel_rdt: Return state to default on umount
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On Fri, 11 Nov 2016, Fenghua Yu wrote:
> @@ -801,6 +801,7 @@ static void rmdir_all_sub(void)
>  {
>  	struct rdtgroup *rdtgrp, *tmp;
>  	struct task_struct *p, *t;
> +	int cpu;
>  
>  	/* move all tasks to default resource group */
>  	read_lock(&tasklist_lock);
> @@ -819,10 +820,19 @@ static void rmdir_all_sub(void)
>  		/* Remove each rdtgroup other than root */
>  		if (rdtgrp == &rdtgroup_default)
>  			continue;
> +
> +		/* Give any CPUs back to the default group */
> +		cpumask_or(&rdtgroup_default.cpu_mask,
> +			   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);

That's a pointless exercise. We can simply copy cpu_online_mask to the
default group mask and be done with it. I'll fix that up.

Thanks,

	tglx