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Fri, 25 Sep 2020 02:22:27 +0000 From: =?iso-2022-jp?B?SE9SSUdVQ0hJIE5BT1lBKBskQktZOH0hIUQ+TGkbKEIp?= To: Oscar Salvador CC: "akpm@linux-foundation.org" , "aris@ruivo.org" , "mhocko@kernel.org" , "tony.luck@intel.com" , "cai@lca.pw" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" Subject: Re: [PATCH v4 5/7] mm,hwpoison: drain pcplists before bailing out for non-buddy zero-refcount page Thread-Topic: [PATCH v4 5/7] mm,hwpoison: drain pcplists before bailing out for non-buddy zero-refcount page Thread-Index: AQHWjMyLiefsQAYaPUOJQQGH511pNKl4q9OA Date: Fri, 25 Sep 2020 02:22:27 +0000 Message-ID: <20200925022227.GB31132@hori.linux.bs1.fc.nec.co.jp> References: <20200917081049.27428-1-osalvador@suse.de> <20200917081049.27428-6-osalvador@suse.de> In-Reply-To: <20200917081049.27428-6-osalvador@suse.de> Accept-Language: ja-JP, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: suse.de; dkim=none (message not signed) header.d=none;suse.de; dmarc=none action=none header.from=nec.com; 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x-ms-exchange-antispam-messagedata: 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 Content-Type: text/plain; charset="iso-2022-jp" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nec.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TY2PR01MB3210.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 91e390ad-9812-42b1-2492-08d860f9d8e6 X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Sep 2020 02:22:27.4539 (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: ioB+13mxPN1VVr5IeJW44DGqpC5UrtRkydRLLEFPScihCswmV4NrWlih8HpLM2Mdhj2fmqLAGr7VxbT8tBDuEw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYBPR01MB5486 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Sep 17, 2020 at 10:10:47AM +0200, Oscar Salvador wrote: > A page with 0-refcount and !PageBuddy could perfectly be a pcppage. > Currently, we bail out with an error if we encounter such a page, meaning > that we do not handle pcppages neither from hard-offline nor from > soft-offline path. >=20 > Fix this by draining pcplists whenever we find this kind of page and retr= y > the check again. It might be that pcplists have been spilled into the > buddy allocator and so we can handle it. >=20 > Signed-off-by: Oscar Salvador Acked-by: Naoya Horiguchi =