From: Reinette Chatre <reinette.chatre@intel.com>
To: Chen Yu <yu.c.chen@intel.com>, <tony.luck@intel.com>
Cc: <tglx@kernel.org>, <bp@alien8.de>, <mingo@redhat.com>,
<dave.hansen@linux.intel.com>, <hpa@zytor.com>,
<fenghuay@nvidia.com>, <babu.moger@amd.com>, <chen.yu@linux.dev>,
<x86@kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v6 2/9] x86/resctrl: Require 64-bit x86 for resctrl support
Date: Wed, 19 Aug 2026 15:55:47 -0700 [thread overview]
Message-ID: <6c933b5c-620d-4684-b651-48a7ebdfc956@intel.com> (raw)
In-Reply-To: <980c4d9c15862de0b0dbc535b646f6b96ea46abe.1784968626.git.yu.c.chen@intel.com>
Hi Chenyu,
On 7/25/26 2:22 AM, Chen Yu wrote:
> All known hardware that supports Intel RDT or AMD QoS is 64-bit. Future
> enhancements like MMIO-based Enhanced RDT (ERDT) monitoring require
> readq()/writeq() which are only available on 64-bit. There is also no
> realistic use case for users to build a 32-bit kernel on a server and
> enable resctrl.
>
> Drop 32-bit support by changing the X86_CPU_RESCTRL dependency from X86
> to X86_64.
>
> Since X86_CPU_RESCTRL now implies X86_64, remove the redundant X86_64
> dependency from X86_CPU_RESCTRL_INTEL_AET.
>
> Signed-off-by: Chen Yu <yu.c.chen@intel.com>
> Tested-by: Hongyu Ning <hongyu.ning@linux.intel.com>
> ---
Reviewed at:
https://lore.kernel.org/lkml/d97deaa1-f42c-4fce-8ca8-5ccf8d822cd2@intel.com/
Reinette
next prev parent reply other threads:[~2026-08-19 22:55 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-25 9:20 [PATCH v6 0/9] Introduce MMIO-based CMT access for Enhanced RDT Chen Yu
2026-07-25 9:22 ` [PATCH v6 1/9] x86/topology: Export topo_lookup_cpuid() for resctrl use Chen Yu
2026-08-19 22:55 ` Reinette Chatre
2026-08-22 4:16 ` Chen Yu
2026-07-25 9:22 ` [PATCH v6 2/9] x86/resctrl: Require 64-bit x86 for resctrl support Chen Yu
2026-08-19 22:55 ` Reinette Chatre [this message]
2026-08-20 15:20 ` Luck, Tony
2026-08-20 15:54 ` Reinette Chatre
2026-08-20 17:01 ` Luck, Tony
2026-08-20 17:12 ` Dave Hansen
2026-08-20 17:48 ` Reinette Chatre
2026-08-21 2:37 ` Borislav Petkov
2026-08-21 11:28 ` Peter Zijlstra
2026-07-25 9:22 ` [PATCH v6 3/9] x86/resctrl: Parse ACPI ERDT table and save CACD cpumask for RMDD domains Chen Yu
2026-08-19 23:01 ` Reinette Chatre
2026-07-25 9:23 ` [PATCH v6 4/9] x86/resctrl: Attach ACPI ERDT information to L3 mon domain on CPU online Chen Yu
2026-08-19 23:04 ` Reinette Chatre
2026-07-25 9:23 ` [PATCH v6 5/9] x86/resctrl: Parse ACPI CMRC table Chen Yu
2026-08-19 23:06 ` Reinette Chatre
2026-07-25 9:23 ` [PATCH v6 6/9] x86/resctrl: Refactor the monitor read function Chen Yu
2026-08-19 23:07 ` Reinette Chatre
2026-07-25 9:23 ` [PATCH v6 7/9] fs/resctrl: Do not invoke smp_processor_id() in preemptible context Chen Yu
2026-08-19 23:08 ` Reinette Chatre
2026-07-25 9:23 ` [PATCH v6 8/9] x86/resctrl: Introduce erdt_cpu_has() and erdt_support() Chen Yu
2026-08-19 23:08 ` Reinette Chatre
2026-07-25 9:23 ` [PATCH v6 9/9] x86/resctrl: Add MMIO-based LLC occupancy monitoring support Chen Yu
2026-08-19 23:10 ` Reinette Chatre
2026-08-13 6:43 ` [PATCH v6 0/9] Introduce MMIO-based CMT access for Enhanced RDT Chen Yu
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