Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18;
From:   =?utf-8?B?SE9SSUdVQ0hJIE5BT1lBKOWggOWPo+OAgOebtOS5nyk=?= 
        <naoya.horiguchi@nec.com>
To:     Yang Shi <shy828301@gmail.com>
CC:     Naoya Horiguchi <naoya.horiguchi@linux.dev>,
        Linux MM <linux-mm@kvack.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Miaohe Lin <linmiaohe@huawei.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5] mm/hwpoison: fix race between hugetlb free/demotion
 and memory_failure_hugetlb()
Thread-Topic: [PATCH v5] mm/hwpoison: fix race between hugetlb free/demotion
 and memory_failure_hugetlb()
Thread-Index: AQHYPYZPUV0YUqyZX0uAEo2rlZPAm6zKtYUA
Date:   Tue, 22 Mar 2022 02:55:30 +0000
Message-ID: <20220322025528.GA188243@hori.linux.bs1.fc.nec.co.jp>
References: <20220318051612.271802-1-naoya.horiguchi@linux.dev>
 <CAHbLzkrYf=jF2ZGLur5JpB_smoUkp51e2x1v5mr3CD5z73D=Ow@mail.gmail.com>
In-Reply-To: <CAHbLzkrYf=jF2ZGLur5JpB_smoUkp51e2x1v5mr3CD5z73D=Ow@mail.gmail.com>
Accept-Language: ja-JP, en-US
Content-Language: en-US
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?utf-8?B?RW1KVFpqT3hLcnJCNHJObjVCYUV6LzJFTzR0NW5YUVd6cjhxanQybnQ3N0Rl?=
 =?utf-8?B?ODk4bkJoMU1WKy8weEFTZ2hqMmN2MWRwaTVkNms0MkpxSWkyNmwrbEwzNTE3?=
 =?utf-8?B?ZGFadWtwTzhuTE1RQ3RmNndJbTA3TWR0aXZjSHYyenZHZzgzd0xlL2RNWUFj?=
 =?utf-8?B?U1pRcHV0aFZ3T3djbCtkRFZVOVlZUUlici9nMGxTN2wxQU0rWElkV1REendN?=
 =?utf-8?B?K1I4dmVxS1hMN0ZIbTV6UGxMSGxnNUg4cDlsbUlPbmlRMFhRS2RMd3Frb3BY?=
 =?utf-8?B?bGFUVUlFOEFaNk9JV2grR29VZXJOY3Z0N3prZnp4TUZHQjlmZ2loL3RMdFNL?=
 =?utf-8?B?UUt0emRtZ2h6RHpQeVNBdnZQY2NLZzBLTzZZTERZN0h3d2pKUVpQWEVWTmpH?=
 =?utf-8?B?VHhQcEFNc0VGempKdFB5RVJhWlJnMHNGVzVVd2RSbnJNZVZVM1hvT0h4VFVI?=
 =?utf-8?B?d1NKbkpxZVhvY1pkUWt6U21waVRYYjNJVHJQZEEyMldGZ1FFZVppbER6VjlO?=
 =?utf-8?B?alhQYXBGL2U1MFp4S0IzVEdTM2lWenkyTzIwaDZEbCtkcU1GWEJGWXhOaXMw?=
 =?utf-8?B?SCtTeTl5b1BqYXByNEVzUXA2NHhnL05INjlWVG9nZFlOb000NkFiTlhNMFJ6?=
 =?utf-8?B?UTFCUUxYN3RRVVU2bFNPbFRmeGtiVHFaMllOalQ2R0JUc1V3TmR0QlE0MDUy?=
 =?utf-8?B?MUdTYjFFQ0JtTVFqZlQxVUtSQkt6VTNoRlBDWDMvWHg4ZnJLL0V3aHJXd0x3?=
 =?utf-8?B?OFpoSTA4c283Y2dpQkQySWZrMitmazE2VDI0YzVPVVBPcEdxVTBwWExuc0Iy?=
 =?utf-8?B?TEdDUDdPaUJhK3BYRm5vbFV3NEFtblZTWDZKMENxZFl3bmM1Z0REdXk5TXhw?=
 =?utf-8?B?bUNMQU5ObWxib2k5N2pqQ3VtQWtqbEw0c2VKMWkvNXBCY21aNXl4Z0FNN0Jk?=
 =?utf-8?B?Z1VTanhKSnpUc2xWMElNZkFZc1BJbDNNZVI0ZWhEKy90R0p4QzROTmlxR0Nv?=
 =?utf-8?B?Ym1qOU1pOW12VFBZWWNGSXhIeTJBTHFURHZ6emczU0dzZGMwWWxpTVlvc1cx?=
 =?utf-8?B?R3daN3RtQ1V1YWhzbDBNRFQ4QW05eVkyaHNtdE8vWWZCaW1JTW9PeWs2WUJM?=
 =?utf-8?B?bWJPY0tPbmFYbzhLWTIzRStuRG50K3RIM2lDcEhjR3ZScy9NSzBEam5MdjVq?=
 =?utf-8?B?Q3Q0cm1WL2htSkc3VTZYckZvbXArMmxSV3l2V2k0bnRFL2R6b1lEWitnR1NG?=
 =?utf-8?B?cnlMMXhWdWdYbEF1OTdMMFNqYklUTm1yekpwVUZmdGh5RTlUV2Q1VStYMTcw?=
 =?utf-8?B?eTAwZm15eHJJUEFNSzJzZk1INlpoQm9DcTNzd0REYW5UZVhScmk2NVhIN0tp?=
 =?utf-8?B?UFBCbjI0VGpSS2hDTEdoSFIzeTkwendRSk1WSnlNL2NFZm8wcTRaSGRiMHZO?=
 =?utf-8?B?ZmxRMmxPNElET3NPY1RBMVJvbjBsQjhPM3EyRE4rMWFLTkFveURiWGtpT1B2?=
 =?utf-8?B?VTROd3NzbFhWdVVBQ3h5Z3dSVHNPRG9Qcm4wUGxTNHZkUC9vQytsdEhGU2dY?=
 =?utf-8?B?bTRMQ0VUc3ZieDl0MmxHMTc3VUZCR2lhZzRMM2VnbUhyVGxSRGtmL1RsbG9O?=
 =?utf-8?B?VE5EQmZQdGJxcjl3YzJra01DNTFaeXBEUWpZZ0cwa2FlVFJMMUdjTkxDNVVK?=
 =?utf-8?B?YzlJUndvMkg1SXhwUWFWN29qTTErckwzZDJ5V1VtOHB2Z0dBbklUazhOSG0z?=
 =?utf-8?B?VjBNcE5STVF6ZzI3SHgxODl0V3cxMHdjcVR4MlRnQXNHaVd5VzVkZlB6TnJs?=
 =?utf-8?B?ZER3UjF5Uk0ydFp2clNlQVR1VFk1QnNrVTNleW9HR2dmeHVmK0V6emROZXlQ?=
 =?utf-8?B?aHpmSDNUcVlJZlFodWUva09SbXlKLzJVVTViK21jQXUzN0FKRGY2czVGVlFQ?=
 =?utf-8?B?SXpZNzRFN3BwRjlOS2IwNmt1UzFEeVkxK0cvYUs2bVBnZW50V2VySEVIVGlO?=
 =?utf-8?B?amZ0WHZxUmV3PT0=?=
Content-Type: text/plain; charset="utf-8"
Content-ID: <F95359BB08BC484785A131BFC5988D00@jpnprd01.prod.outlook.com>
Content-Transfer-Encoding: base64
MIME-Version: 1.0
X-OriginatorOrg: nec.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: TYWPR01MB8591.jpnprd01.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 87c57d94-4bb5-4383-4363-08da0baf6d59
X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Mar 2022 02:55:30.7001
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: e67df547-9d0d-4f4d-9161-51c6ed1f7d11
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: ZAJqhB+ryAjdZPeYyqmyxBY0mV9J+DxsUAGVPUT09rFeHIdjNwz62qkkSZFjlQ6lh4LArIZ2klIrEfZXQBS4qw==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: OS3PR01MB9461
X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,
	DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,RDNS_NONE,SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE
	autolearn=no 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
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