linux-kernel - Re: [PATCH v5 0/4] selftests/resctrl: Add Hygon CPUs support and bug fixes

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Message-ID: <3692e9fb-b827-413f-902e-a57d6d3aca20@kernel.org>
Date: Fri, 9 Jan 2026 16:51:41 -0700
From: Shuah <shuah@...nel.org>
To: Reinette Chatre <reinette.chatre@...el.com>,
 Xiaochen Shen <shenxiaochen@...n-hieco.net>, tony.luck@...el.com,
 bp@...en8.de, fenghuay@...dia.com, shuah@...nel.org
Cc: babu.moger@....com, james.morse@....com, Dave.Martin@....com,
 x86@...nel.org, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org, Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v5 0/4] selftests/resctrl: Add Hygon CPUs support and bug
 fixes

Hi Reinette,

On 1/8/26 09:02, Reinette Chatre wrote:
> Dear Shuah,
> 
> Could you please consider this series for inclusion?
> 
> Thank you very much.
> 
> Reinette
> 
> On 12/16/25 7:04 PM, Xiaochen Shen wrote:
>> The resctrl selftest currently exhibits several failures on Hygon CPUs
>> due to missing vendor detection and edge-case handling specific to
>> Hygon's architecture.
>>
>> This patch series addresses three distinct issues:
>> 1. A division-by-zero crash in SNC detection on some platforms (e.g.,
>>     Hygon).
>> 2. Missing CPU vendor detection, causing the test to fail with
>>     "# Can not get vendor info..." on Hygon CPUs.
>> 3. Incorrect handling of non-contiguous CBM support on Hygon CPUs.
>>
>> These changes enable resctrl selftest to run successfully on
>> Hygon CPUs that support Platform QoS features.
>>
>> Maintainer notes:
>> -----------------
>> Patch 1: selftests/resctrl: Fix a division by zero error on Hygon
>>   - This is a candidate for backport with "Fixes:" tag.
>>
>> Patch 2: selftests/resctrl: Define CPU vendor IDs as bits to match usage
>>   - This is *not* a candidate for backport since it is an enhancement and
>>     preparatory patch for patch 3.
>>
>> Patch 3: selftests/resctrl: Add CPU vendor detection for Hygon
>> Patch 4: selftests/resctrl: Fix non-contiguous CBM check for Hygon
>>   - Even though they are fixes they are *not* candidates for backport
>>     since they are based on another patch series (x86/resctrl: Fix
>>     Platform QoS issues for Hygon) which is in process of being added to
>>     resctrl.
>> -----------------

Applied to linux-kselftest next branch for Linux 6.20-rc1

thanks,
-- Shuah