linux-kernel - Re: [PATCH v2 05/23] x86/resctrl: Add domain online callback for resctrl work

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Date:   Fri, 15 Oct 2021 15:19:51 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     James Morse <james.morse@....com>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        H Peter Anvin <hpa@...or.com>,
        Babu Moger <Babu.Moger@....com>,
        <shameerali.kolothum.thodi@...wei.com>,
        Jamie Iles <jamie@...iainc.com>,
        "D Scott Phillips OS" <scott@...amperecomputing.com>,
        <lcherian@...vell.com>, <bobo.shaobowang@...wei.com>,
        <tan.shaopeng@...itsu.com>
Subject: Re: [PATCH v2 05/23] x86/resctrl: Add domain online callback for
 resctrl work

Hi James,

On 10/1/2021 9:02 AM, James Morse wrote:

...

> @@ -527,21 +492,15 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
>   		return;
>   	}
>   
> -	if (r->mon_capable && domain_setup_mon_state(r, d)) {
> -		kfree(hw_dom->ctrl_val);
> -		kfree(hw_dom->mbps_val);
> -		kfree(hw_dom);
> -		return;
> -	}
> -
>   	list_add_tail(&d->list, add_pos);
>   
> -	/*
> -	 * If resctrl is mounted, add
> -	 * per domain monitor data directories.
> -	 */
> -	if (static_branch_unlikely(&rdt_mon_enable_key))
> -		mkdir_mondata_subdir_allrdtgrp(r, d);
> +	err = resctrl_online_domain(r, d);
> +	if (err) {
> +		list_del(&d->list);
> +		kfree(hw_dom->ctrl_val);
> +		kfree(hw_dom->mbps_val);
> +		kfree(d);

Even though this goes away in next patch I think this should rather be 
kfree(hw_dom).

Reinette