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Wysocki" , Len Brown , Pavel Machek , Li Ming , Jeff Johnson , Ying Huang , Yao Xingtao , Peter Zijlstra , Greg Kroah-Hartman , Nathan Fontenot , Terry Bowman , "Robert Richter" , Benjamin Cheatham , Zhijian Li , Borislav Petkov , "Tomasz Wolski" Message-ID: <69794c2512bfc_1d3310087@dwillia2-mobl4.notmuch> In-Reply-To: <9c5150ba-c443-4ce1-a750-57736f0dabf0@amd.com> References: <20260122045543.218194-1-Smita.KoralahalliChannabasappa@amd.com> <20260122045543.218194-4-Smita.KoralahalliChannabasappa@amd.com> <20260122161858.00004b0c@huawei.com> <9c5150ba-c443-4ce1-a750-57736f0dabf0@amd.com> Subject: Re: [PATCH v5 3/7] cxl/region: Skip decoder reset on detach for autodiscovered regions Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: BYAPR21CA0004.namprd21.prod.outlook.com (2603:10b6:a03:114::14) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|DS4PPF10012BF96:EE_ X-MS-Office365-Filtering-Correlation-Id: 8b42c36b-640a-4641-9c25-08de5dfcfe10 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014; 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So that means > commit_store() needs to clear CXL_REGION_F_AUTO to get the decoder reset > to happen." >=20 > Today the sysfs commit=3D0 path inside commit_store() resets decoders=20 > without the AUTO check whereas the detach path now skips the reset when=20 > CXL_REGION_F_AUTO is set. >=20 > I think the same rationale should apply to the sysfs de-commit path as=20 > well? I=E2=80=99m trying to understand the implications of not guarding t= he=20 > reset with AUTO in commit_store(). Linux tends to give the administrator the ability to know better than the kernel. So if the root forcefully decommits the region, root gets to keep the pieces.=