linux-kernel - Re: [PATCH v9 19/27] x86/resctrl: Always initialise rid field in rdt_resources

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Message-ID: <941faef0-eaac-4105-ac8b-72f370c5aa07@intel.com>
Date: Thu, 1 May 2025 10:31:43 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: James Morse <james.morse@....com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>
CC: 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>, "D Scott
 Phillips OS" <scott@...amperecomputing.com>, <carl@...amperecomputing.com>,
	<lcherian@...vell.com>, <bobo.shaobowang@...wei.com>,
	<tan.shaopeng@...itsu.com>, <baolin.wang@...ux.alibaba.com>, Jamie Iles
	<quic_jiles@...cinc.com>, Xin Hao <xhao@...ux.alibaba.com>,
	<peternewman@...gle.com>, <dfustini@...libre.com>, <amitsinght@...vell.com>,
	David Hildenbrand <david@...hat.com>, Rex Nie <rex.nie@...uarmicro.com>,
	"Dave Martin" <dave.martin@....com>, Koba Ko <kobak@...dia.com>, Shanker
 Donthineni <sdonthineni@...dia.com>, <fenghuay@...dia.com>
Subject: Re: [PATCH v9 19/27] x86/resctrl: Always initialise rid field in
 rdt_resources_all[]

Hi James,

On 4/25/25 10:38 AM, James Morse wrote:
> x86 has an array, rdt_resources_all[], of all possible resources.
> The for-each-resource walkers depend on the rid field of all
> resources being initialised.
> 
> If the array ever grows due to another architecture adding a resource
> type that is not defined on x86, the for-each-resources walkers will
> loop forever.
> 
> Initialise all the rid values in resctrl_arch_late_init() before
> any for-each-resource walker can be called.
> 
> Signed-off-by: James Morse <james.morse@....com>
> 
> ---

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Reinette