Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <0d0ecaf5-c186-8a17-99a8-a732dc716b19@amd.com>
Date:   Fri, 23 Sep 2022 22:22:36 +0530
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
 Thunderbird/91.13.0
Subject: Re: [PATCH v2] x86,acpi: Limit "Dummy wait" workaround to older AMD
 and Intel processors
Content-Language: en-US
To:     Borislav Petkov <bp@alien8.de>
Cc:     linux-kernel@vger.kernel.org, rafael@kernel.org, lenb@kernel.org,
        linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org,
        dave.hansen@linux.intel.com, tglx@linutronix.de, andi@lisas.de,
        puwen@hygon.cn, mario.limonciello@amd.com, peterz@infradead.org,
        rui.zhang@intel.com, gpiccoli@igalia.com,
        daniel.lezcano@linaro.org, ananth.narayan@amd.com,
        gautham.shenoy@amd.com, Calvin Ong <calvin.ong@amd.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        stable@vger.kernel.org
References: <20220923153801.9167-1-kprateek.nayak@amd.com>
 <Yy3U0fQ0GZYZnMa1@zn.tnic> <f020defb-df73-35ff-5d97-c07773bafb67@amd.com>
 <Yy3fFciusHZ2h1GW@zn.tnic>
From:   K Prateek Nayak <kprateek.nayak@amd.com>
In-Reply-To: <Yy3fFciusHZ2h1GW@zn.tnic>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?ZHE3bDFXWDhVTzAwUmpOdWh6NnFscGEzKzlKYmJ5Rk1pVGUvUWFGYTNzV3dM?=
 =?utf-8?B?V2QrK0FlMkdSbm1wbW9yNzUyYmcxcFFNTHdFcVlDQlU2SmxqMHVlTW9WYXY4?=
 =?utf-8?B?N2FOOEM0cnZRU1JXZnhWVzRzY1pDc2lQWWZ2cFIvWE80NThaVkVuNzNyR1F0?=
 =?utf-8?B?clVBeDJBY2ZXZmFwUGY4WDh6STRlTE44Z3ViTVZNS2xtaUhQdmg3SWtHUFR2?=
 =?utf-8?B?MFMrM05zRCs0UTV2NXJYaFI4K3lEY3g1bXMyamZwMnRoSm1tZVJGV0hOQ1Bn?=
 =?utf-8?B?akl1RmMvaExnZWwxSGVoNUkrcWd6eVhOQWRnSms5NitaZlU3dzlaN1ZXb0VN?=
 =?utf-8?B?c1FJR2lYcmpjcUoxK3FGMHFMVDV5RzBNVThoZXczRXlnamVkOWE1d21sQmJJ?=
 =?utf-8?B?Mklhd0VYT2lUd1NRSFBwNnVjL1YxOEVpZWNFeGh6cnNmR0pkSGpUaGVORzJ1?=
 =?utf-8?B?T0hIZlpvWWphN1piTjU0Sk9ibmlGaEFjZEJJNXEwQXJmUGY2V28yMUxnbFZm?=
 =?utf-8?B?azJtc3lNOUxJblVLU21MOTNKQmNWK2ppUkN6YmxvZ29JOUt1QVhWU01ReU5M?=
 =?utf-8?B?Q3RQcEVXTG4ybHpMMVp6dVpLM2FSVEJwK3dwVkRNUkdhS096NUltVXhpZ1Ry?=
 =?utf-8?B?WGdvdThSaFUzbzFnNGlhbElBV252eVRBaTRXeFB1NnAzUHVJSW9tWGg1Rklr?=
 =?utf-8?B?cHVKSDA1emlZREdsRldLZDcweU50a3pSR2RlUk5kT090WW1TQUdNM3NEUGJY?=
 =?utf-8?B?VExvNVJBQ0QzMWhMazBUMVRES0VhZHhyN3pQTTFhMEVmRkdBNHYycGxYQThp?=
 =?utf-8?B?em9sSjZVTUd6VVJFbjNEbC9WNDU5WlZXOGtROEZnN3NwMGNyT2JkYnBLejNU?=
 =?utf-8?B?SkIwbjZrNUsxQjViei80VjFySmg5VU9UMVp3c3NDTThzY2l4bHprdFEwczVv?=
 =?utf-8?B?TFhxV1JrMHA0ZEYxMmk0VU9NNExFenJnWk0vZU1jMkg0OER2YjhFb1ZIYVBa?=
 =?utf-8?B?M1o3NWhBUnBteStVQnVqWlk0WDkxYWNVSVFXTzFGZHZ6NUN2ckJRVjNtUkc4?=
 =?utf-8?B?djk0b25nSWRPOVhaYUQxTXJ4dnhMbmtvQUN2MG0yd0tFdjkzTTBDckJtWFBK?=
 =?utf-8?B?NVN2Qm9rNkR1dVpFem9QWFRZUUtCWnQyNUpPT25LM2d1NkhNT1BPckVqdVJB?=
 =?utf-8?B?MHp4YlpkSGx4QVBjdFppbjB5SjllTFB5d0JINVpnS3ovRndsYmVqTFNQTE41?=
 =?utf-8?B?QTdqa1RzYVdOU1M1ZVdOUFZvVnlvbTgrK1ppZzlxdy9YaWkvWm1hQ3NuUEJ2?=
 =?utf-8?B?MjBVTGtQT2RrSzlnNEtoYk95RWYxcXVWRVAyRDFKT0poV3FsUGhTZ0l4RUpy?=
 =?utf-8?B?MTNWaTV2VW1XdDBXSFZiODNKZWU5dDZQYitMV2w2NnJsZlhIa1R1OVh6aTkv?=
 =?utf-8?B?RWlySlpJb2k1SlgzZHRqeFpxM1YwY0tLOVZ0MmhvMTYyZjlPVUliTlBTZG1E?=
 =?utf-8?B?L1BmbUgrd1ZjSHlnR0JHclJhaFF5MGNZaDl2aFpyK1V6cHJBdFZIWGpZdWlD?=
 =?utf-8?B?SndvMFB4NmxBMW4yRldtQVVKZVplMWtLdHBuZ2ZxKzV3ZTJ5ME1IbHdvNGhF?=
 =?utf-8?B?RkVIVGk5WnR4QU5mdXpVUlNFYlZyQkZTOXBzRFVPcS9JRG9XWVlEeHEzcDgr?=
 =?utf-8?B?ZHRnZXlFNXd5WWRhbnFlYU1nR3FRdUo0UjJacnJ1YVY2cHNmbWhNeVFXZnpF?=
 =?utf-8?B?SzdSZFpxZWZDUzVLUmhLc1orNy9UK0VYQ3NFdHBLWFQ5d3F5YVdtTkE1NHJy?=
 =?utf-8?B?Ym56cVZMVVk0K0pBV05aam9meXZsWE91cTZFdG5qNFJWcDFDSlY3YXh6L0xT?=
 =?utf-8?B?dmNZZDNWTnVkUzhwdWhIS3RaTzlqaVdPQlBrSmJxd0E3Z1NrSmVvSXdBRDdw?=
 =?utf-8?B?cXErWjk4RmZzbG1LUVZXNUdXWlJobm9ZSmY3a215Q3V2MXNFejJIUFNmNWpa?=
 =?utf-8?B?Z09uM1RGMnhNRDRMR2RRR3lYSU9OQzNPaEljUVNDRnlZUFcyMXpLa2xTdWNo?=
 =?utf-8?B?U3ZLQVNmYnpWeHFFVXRYdXNsYjJPc01UWGhmSk5mcVBxelA0dDNjeFdFSnFy?=
 =?utf-8?Q?xPPOus6pxsT0VYqhOQqmmYUVs?=
X-OriginatorOrg: amd.com
X-MS-Exchange-CrossTenant-Network-Message-Id: c1a64ad4-3b9c-4059-2184-08da9d841022
X-MS-Exchange-CrossTenant-AuthSource: SN1PR12MB2381.namprd12.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Sep 2022 16:52:56.2168
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: 4d+jJEliIHsgtZJU6VCmNiLbuwehZey16GFnMliFr0OCagCAfEV9o9ZOU/YMUAZ9WN1+qlVKOT9xVPnZAHWyGQ==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5775
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,
        RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham
        autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Hello Boris,

On 9/23/2022 10:00 PM, Borislav Petkov wrote:
> [..snip..]
> 
> Well, AFAICT, that box is old and dead. And I'm being told that the AMD
> machines which we care for and which are still alive should not need the
> dummy read.
> 
> Which means, we could try the simple fix first and see who complains.
> 

That's a fair point.
--
Thanks and Regards,
Prateek