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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by DS3PEPF0000C380.mail.protection.outlook.com (10.167.23.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9723.19 via Frontend Transport; Sun, 22 Mar 2026 19:53:56 +0000 Received: from ethanolx50f7host.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Sun, 22 Mar 2026 14:53:54 -0500 From: Smita Koralahalli To: , , , , CC: Ard Biesheuvel , Alison Schofield , Vishal Verma , "Ira Weiny" , Dan Williams , Jonathan Cameron , Yazen Ghannam , Dave Jiang , Davidlohr Bueso , Matthew Wilcox , Jan Kara , "Rafael J . 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 , Smita Koralahalli , Tomasz Wolski Subject: [PATCH v8 2/9] dax/hmem: Factor HMEM registration into __hmem_register_device() Date: Sun, 22 Mar 2026 19:53:35 +0000 Message-ID: <20260322195343.206900-3-Smita.KoralahalliChannabasappa@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260322195343.206900-1-Smita.KoralahalliChannabasappa@amd.com> References: <20260322195343.206900-1-Smita.KoralahalliChannabasappa@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS3PEPF0000C380:EE_|MW4PR12MB7311:EE_ X-MS-Office365-Filtering-Correlation-Id: 164cab45-d6c2-4539-e51a-08de884cc09b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|36860700016|82310400026|18002099003|22082099003|56012099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(7416014)(1800799024)(36860700016)(82310400026)(18002099003)(22082099003)(56012099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: cWvsdGpXGbNQWLyWKhVJMl0sl87soVk+zVRkj4HzCNy09kVMaUOzCLwjkFMFOIcZP6Z9Ki2DnJ8yqXRa40XWT06FcUgRzP2TY0QYIs9uYvuYmnA+QJX/72Vesq/RCueoTqtPTrfdgIUW5X4bEUQmlSE2QAkn6LGQkPVCiEVKZG2jNeZSPK7FugavFcj6l4hNEfZqZt3FAcEXqc32gFNm7vsfUNKjMT+TVsYrHaiApuOWkdPHoJLvayuKMvHj6iDqmX3s8nF0hg1Ay3mgkAmiERCTbNwRlOS7gCPSfcsMMxo2nlpDwnAOoSwiefzh0rf87+ylLeVMwll0t/39JnLRKEb+ya6Y0RAoih0ECKjd8RamvAqM39NB9D//YXfG4MyYWzDrL0sr00Z7tWrvxgzQDnhcGnB+XvjiP8gzth0/o/AmUCCyqC7pvi/+WZVgEzEF X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Mar 2026 19:53:56.2732 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 164cab45-d6c2-4539-e51a-08de884cc09b X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS3PEPF0000C380.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7311 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Separate the CXL overlap check from the HMEM registration path and keep the platform-device setup in a dedicated __hmem_register_device(). This makes hmem_register_device() the policy entry point for deciding whether a range should be deferred to CXL, while __hmem_register_device() handles the HMEM registration flow. No functional changes. Signed-off-by: Smita Koralahalli Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron --- drivers/dax/hmem/hmem.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c index 1cf7c2a0ee1c..a3d45032355c 100644 --- a/drivers/dax/hmem/hmem.c +++ b/drivers/dax/hmem/hmem.c @@ -58,21 +58,14 @@ static void release_hmem(void *pdev) platform_device_unregister(pdev); } =20 -static int hmem_register_device(struct device *host, int target_nid, - const struct resource *res) +static int __hmem_register_device(struct device *host, int target_nid, + const struct resource *res) { struct platform_device *pdev; struct memregion_info info; long id; int rc; =20 - if (IS_ENABLED(CONFIG_CXL_REGION) && - region_intersects(res->start, resource_size(res), IORESOURCE_MEM, - IORES_DESC_CXL) !=3D REGION_DISJOINT) { - dev_dbg(host, "deferring range to CXL: %pr\n", res); - return 0; - } - rc =3D region_intersects_soft_reserve(res->start, resource_size(res)); if (rc !=3D REGION_INTERSECTS) return 0; @@ -123,6 +116,19 @@ static int hmem_register_device(struct device *host, i= nt target_nid, return rc; } =20 +static int hmem_register_device(struct device *host, int target_nid, + const struct resource *res) +{ + if (IS_ENABLED(CONFIG_CXL_REGION) && + region_intersects(res->start, resource_size(res), IORESOURCE_MEM, + IORES_DESC_CXL) !=3D REGION_DISJOINT) { + dev_dbg(host, "deferring range to CXL: %pr\n", res); + return 0; + } + + return __hmem_register_device(host, target_nid, res); +} + static int dax_hmem_platform_probe(struct platform_device *pdev) { return walk_hmem_resources(&pdev->dev, hmem_register_device); --=20 2.17.1