linux-kernel - Re: [PATCH v7 24/31] x86/resctrl: Add energy/perf choices to rdt boot option

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Message-ID: <ccf6db60-2fd9-4d83-8ed8-68e600664fcf@intel.com>
Date: Fri, 25 Jul 2025 16:46:25 -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 v7 24/31] x86/resctrl: Add energy/perf choices to rdt boot
 option

Hi Tony,

On 7/11/25 4:53 PM, Tony Luck wrote:
>  #define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options)
>  
> @@ -865,6 +869,32 @@ bool rdt_cpu_has(int flag)
>  	return ret;
>  }
>  
> +/*
> + * Hardware features that do not have X86_FEATURE_* bits.
> + * There is no "hardware does not support this at all" case.
> + * Assume that the caller has already determined that
> + * support is present and just needs to check if the option has been

nit: "that support is present" -> "that hardware support is present"

option -> feature?

> + * disabled by a quirk that has not been overridden by a command
> + * line option.
> + */

Reinette