linux-kernel - Re: [PATCH v23 14/19] x86/resctrl: Handle removing directories in Sub-NUMA Cluster (SNC) mode

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Date: Tue, 2 Jul 2024 10:53:37 +0200
From: Borislav Petkov <bp@...en8.de>
To: Tony Luck <tony.luck@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	Peter Newman <peternewman@...gle.com>,
	James Morse <james.morse@....com>, Babu Moger <babu.moger@....com>,
	Drew Fustini <dfustini@...libre.com>,
	Dave Martin <Dave.Martin@....com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH v23 14/19] x86/resctrl: Handle removing directories in
 Sub-NUMA Cluster (SNC) mode

On Fri, Jun 28, 2024 at 02:56:14PM -0700, Tony Luck wrote:
>  	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
> -		sprintf(name, "mon_%s_%02d", r->name, dom_id);
> -		kernfs_remove_by_name(prgrp->mon.mon_data_kn, name);
> +		kn = kernfs_find_and_get(prgrp->mon.mon_data_kn, name);
> +		if (!kn)
> +			continue;
> +		kernfs_put(kn);
> +
> +		if (kn->dir.subdirs <= 1)
> +			kernfs_remove(kn);
> +		else
> +			kernfs_remove_by_name(kn, subname);

This...

>  
> -		list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list)
> -			kernfs_remove_by_name(crgrp->mon.mon_data_kn, name);
> +		list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list) {
> +			kn = kernfs_find_and_get(crgrp->mon.mon_data_kn, name);
> +			if (!kn)
> +				continue;
> +			kernfs_put(kn);
> +
> +			if (kn->dir.subdirs <= 1)
> +				kernfs_remove(kn);
> +			else
> +				kernfs_remove_by_name(kn, subname);
> +		}

... and this are almost identical hunks.

Why isn't there a helper which gets called here?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette