linux-kernel - Re: [PATCH v9 29/31] fs/resctrl: Provide interface to create architecture specific debugfs area

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Message-ID: <0cc5fe14-4fe3-4e18-bd50-59476ba73f56@intel.com>
Date: Wed, 10 Sep 2025 10:58:48 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghuay@...dia.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>, Chen Yu <yu.c.chen@...el.com>
CC: <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<patches@...ts.linux.dev>
Subject: Re: [PATCH v9 29/31] fs/resctrl: Provide interface to create
 architecture specific debugfs area

Hi Tony,

On 8/29/25 12:33 PM, Tony Luck wrote:
> diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
> index 1f42bc761377..8a010c29c8b4 100644
> --- a/include/linux/resctrl.h
> +++ b/include/linux/resctrl.h
> @@ -569,6 +569,15 @@ void resctrl_arch_reset_all_ctrls(struct rdt_resource *r);
>  extern unsigned int resctrl_rmid_realloc_threshold;
>  extern unsigned int resctrl_rmid_realloc_limit;
>  
> +/**
> + * resctrl_debugfs_mon_info_arch_mkdir() - Create a debugfs info directory.
> + *					   Removed by resctrl_exit().
> + * @r:	Resource (must be mon_capable).
> + *
> + * Return: dentry pointer on success, or NULL on error.

NULL is returned if resource is not monitoring capable, otherwise
it returns debugfs_create_dir() which is ERR_PTR(-ERROR) on failure.

Reinette