linux-kernel - Re: [PATCH v5 15/29] fs/resctrl: Add an architectural hook called for each mount

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Message-ID: <60fc7751-d26e-4e6b-99ee-58e99f1e3783@intel.com>
Date: Tue, 3 Jun 2025 20:49:25 -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>, Anil Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Chen Yu <yu.c.chen@...el.com>
CC: <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<patches@...ts.linux.dev>
Subject: Re: [PATCH v5 15/29] fs/resctrl: Add an architectural hook called for
 each mount

Hi Tony,

On 5/21/25 3:50 PM, Tony Luck wrote:
> diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
> index 306afb50fd37..f8c9840ce7dc 100644
> --- a/arch/x86/kernel/cpu/resctrl/core.c
> +++ b/arch/x86/kernel/cpu/resctrl/core.c
> @@ -710,6 +710,15 @@ static int resctrl_arch_offline_cpu(unsigned int cpu)
>  	return 0;
>  }
>  
> +void resctrl_arch_pre_mount(void)
> +{
> +	static atomic_t only_once;

Looks like the custom is to initialize with ATOMIC_INIT(0).

Reinette