From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 909AE606A33C for ; Thu, 29 Oct 2026 05:03:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=outlook.com header.i=@outlook.com header.a=rsa-sha256 header.s=selector1 header.b=iwwagKXA Received: by kanga.kvack.org (Postfix) id A664C6B05B1; Thu, 29 Oct 2026 01:03:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A16A96B05B2; Thu, 29 Oct 2026 01:03:31 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8DDF46B05B3; Thu, 29 Oct 2026 01:03:31 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 626D76B05B1 for ; Thu, 29 Oct 2026 01:03:31 -0400 (EDT) Received: from smtpin09.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id E1465160271 for ; Thu, 29 Oct 2026 05:03:30 +0000 (UTC) X-FDA: 85374470580.09.A657648 Received: from MW6PR02CU001.outbound.protection.outlook.com (mail-westus2azolkn19012023.outbound.protection.outlook.com [52.103.10.23]) by imf02.hostedemail.com (Postfix) with ESMTP id 2C8BA80004 for ; Thu, 29 Oct 2026 05:03:28 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=outlook.com header.s=selector1 header.b=iwwagKXA; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf02.hostedemail.com: domain of x-professor@outlook.com designates 52.103.10.23 as permitted sender) smtp.mailfrom=x-professor@outlook.com; dmarc=pass (policy=none) header.from=outlook.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1793250208; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding:in-reply-to: references:dkim-signature; bh=DqiFzpc0xHaVGhfwxqUGFRgPJkquueCfeSJ73YunQ7U=; b=fUop4W5FdgEFvsfmIxb9IKtDY1thhv7k0Dy9HtKS85cjGUrzwoau0vMJTvQTwKM8Q+X4x7 JqD4oaB+cs3HtHgZi+b6Qrx+zmm41+9Jb8BdZbgBZ5N3adENWjD74ntNfSiqW3qYAQPHW5 dQpfekZDAx2+rf2OBAcobOOFDv21dZU= ARC-Authentication-Results: i=2; imf02.hostedemail.com; dkim=pass header.d=outlook.com header.s=selector1 header.b=iwwagKXA; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf02.hostedemail.com: domain of x-professor@outlook.com designates 52.103.10.23 as permitted sender) smtp.mailfrom=x-professor@outlook.com; dmarc=pass (policy=none) header.from=outlook.com ARC-Seal: i=2; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=pass; t=1793250208; b=mKVCMHb2ccwZyXe6nhTHBtN3hfWobgyKbStMYkiIe5/nIau7H540/9b3UddqaKhOEvvT+v phJz36mrdxJfqZF1tFIR89Q5fs5kFAH1mjpJvwLo63Ip9SWytHroGLNwIKGUx1zKXh6uI/ hSzQlwXLFOeiyGr6cfiRK/zd0sMWDjs= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=wQD+kwU6+cDduEpL+RNr9JeO6seyyMQ+vPVe20a+MX05hoBi155UWIIaPbF1Wzp0VtqMBAScilSRDDS+a7G0PAh9sfa8ipSHoCaxAkFKYvrTvg31I1iJfVyMWewrxqyx+uVcZMbjLYozTZc5CwX/qAo6ch5ikZ+nNOsk0wvx8sozber5uYXzzHh9r3ua0x8HIHzvB//bdu97SxBV3JFb7IOdLSRHk2oaPJiD8U1/P435I9v3VDYJvC9YOBwUDZ8q28SSHUZeNw+ADdGSNlxYEO69T7swJyMOL4rhu+rz8D36ZgiKzEZAxuX3N64lw651HiepQjzjGwWvNdo1UpUe2A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:MIME-Version; bh=DqiFzpc0xHaVGhfwxqUGFRgPJkquueCfeSJ73YunQ7U=; b=rDTzXKPKr8eWvKghwmFJBvtYedJnCJ6v5F4wmrDR7EaayhTugDIGiF42ews7JSL0RcpcoLH063uvnyM9hESEsIGyIxALkohhafJF3ujmDbPu9IAe+rMd+Djd2O/iocLsKlp/Fc++If9dZwP3/SX7wNOdFyDrMzdTx9Atq5iE6ppZKf94RDfPq+XK0PZyHI1mC5p3gnKOomwyctFWTkmkuWYKXasKFMtG6JYvba1U45MtI371MWQyNuc/WMYB153jAy9b6H/r6JTsE9EajY1oxa4InmPMCekvwl77cumEqEZPOKA48GKmLYjBdbAeQ1T2lAJCZ6CgHk4NWzqm3gQ/Pg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none; dmarc=none; dkim=none; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=outlook.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=DqiFzpc0xHaVGhfwxqUGFRgPJkquueCfeSJ73YunQ7U=; b=iwwagKXAZrLSw1xZ4Xt7VXy2zjir8HyjgvdHqH3i/QRkDwmzDnNE/MykCouSvOHh8O0whnIBZcedO9QrcJ/UZCSCS+BYV/skZbzWz+IiAmLgV5Y/KA230AW4phRdAtICIMgD8100xcYN1zuWyHgLSuOyMkZ5jNenDirrNY3uRDuqnY+z/qVRrNK/IKcks2maIO7KPrBYzQR2LD35kEHrpkfqwRets0InzfZehcE5k8EZ5KocypaARxcW138V/7uFYgJdNJTCL1GrtFNUL7CXQ/lRefR3lDtL4A57Ulung0uwUCf1UUSSIhfUb45oke8bnF5tsjMndOu7tofZ5KCQpA== Received: from SA3PR05MB10385.namprd05.prod.outlook.com (2603:10b6:806:39d::17) by SJ0PR05MB8214.namprd05.prod.outlook.com (2603:10b6:a03:390::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.546.22; Thu, 29 Oct 2026 05:03:24 +0000 Received: from SA3PR05MB10385.namprd05.prod.outlook.com ([fe80::e22f:a0f5:fcb0:9b0d]) by SA3PR05MB10385.namprd05.prod.outlook.com ([fe80::e22f:a0f5:fcb0:9b0d%6]) with mapi id 15.21.0546.021; Thu, 29 Oct 2026 05:03:24 +0000 From: Yingjie Wang To: "akpm@linux-foundation.org" , Manfred Spraul , Alexey Gladkov , "Eric W . Biederman" CC: Yingjie Wang , Vasily Averin , Johannes Weiner , Shakeel Butt , =?iso-8859-1?Q?Michal_Koutn=FD?= , Michal Hocko , Alejandro Colomar , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "cgroups@vger.kernel.org" , "linux-api@vger.kernel.org" , "linux-man@vger.kernel.org" , "linux-hardening@vger.kernel.org" Subject: [PATCH v5 0/3] ipc/sem: account dynamic sops arrays and validate SEMOPM Thread-Topic: [PATCH v5 0/3] ipc/sem: account dynamic sops arrays and validate SEMOPM Thread-Index: AQHdZ2LT/+5o4bKjo02vICQcsvNQYg== Date: Thu, 29 Oct 2026 05:03:24 +0000 Message-ID: Accept-Language: en-US, zh-CN Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: SA3PR05MB10385:EE_|SJ0PR05MB8214:EE_ x-ms-office365-filtering-correlation-id: 6f74eb51-4ead-4e3e-a0f2-08df3579f5e7 x-microsoft-antispam: BCL:0;ARA:14566002|31061999003|12121999013|38102599003|24021099003|4140399003|15080799012|19110799012|8062599012|8060799015|25010399006|2604032031799003|5062599005|22091999003|21061999006|11091999009|24121999003|1602099012|10035399007|52005399003|40105399003|26121999007|102099032|4302099013|440099028|3412199025|1710799026; x-microsoft-antispam-message-info: =?iso-8859-1?Q?/T66Q5us69k/LX5YG+RBFZjjj/HMqSlnoXKuEG5jAF4C5XLatTgGAHYAlv?= =?iso-8859-1?Q?58k584IKehcNUPd4bryMpckjFNG18bEDSWXE+NqF2ro+brUqyNNwYO4xuE?= =?iso-8859-1?Q?aMQ75TIwY0H5riTF4j6j2tcBnB5VMyBYVrgHeh6eTFWCQyY8yBnH05obXB?= =?iso-8859-1?Q?sCOmAWye6MgU8DnGx2v1xl8oOtnRiD09hPYkLuJ5Y7Ad4UynH+HCMEBYhj?= =?iso-8859-1?Q?qwhJiLDNFTa7BYVwlMjC0cfNJ/jxBiBMNFxUJ0flHmuENDI1NzqeydFcco?= =?iso-8859-1?Q?rDPMnS9L2SWR8U+g06VhQHSlm5QzNGA4IWMuIoZ0PQe0qR2ErJQeNyDD8q?= =?iso-8859-1?Q?+2M67iP5AlPVIkdLJ8Kbad2ryg8iQZTk7TJ7DN6bVNjyt+4l5bEr9fbs8M?= =?iso-8859-1?Q?+/AJHevdJvH9qMZekUzOcp0rxe6jKz1PK4jMZdIT5ZH+4FZ7PClPmQbQvD?= =?iso-8859-1?Q?q23dYt3rLrTVvXpYavLiQkNODnXYLPMwJ4r3VNWmSVroQEG6fnEFwa2SUS?= =?iso-8859-1?Q?0kOzaC0hB3N3m+5XdetSIHZGjqHblNB22K2UmLs5mfWRuI/rv5TixZyy5Z?= =?iso-8859-1?Q?WslSjckRCKxVDyKzmpKZjTHj/4v80/8mC4Qoenzf3f101bhOMngq35gHLY?= =?iso-8859-1?Q?qrWVHitj81SxNPcujbAmTZXlkC1Dj3a1PqUCEMppV9X5/vpBilbUvitvsp?= =?iso-8859-1?Q?DGezC7bSjRO2GgBSmaDwx8RFr53QXTN4RYjotWdfd5/I2K+c7vWCbDZC4V?= =?iso-8859-1?Q?ZXLtxBPHVjvX5V0OUJDhXmQODLKmuFzSs30gWuVn0bxAZlqSou7kCovci4?= =?iso-8859-1?Q?mlcvsdHFeKYIABaBMlzUFUY3hVJxxCfOSV9JUoigFXJFawGC5mTuwJsuGq?= =?iso-8859-1?Q?a6NQ4DIf3K5Dn8UCnjcOy1+fDOZmeqH63w4drBH5sjuKa3vEDYd9hZr3dL?= =?iso-8859-1?Q?0Y8YkLMkEI1liK77yW1mHFn7sdUr7NXjQGFp8SuG9+phCAeyHkDC9Mbxrn?= =?iso-8859-1?Q?3Tcxt/fRFGd6aoJOLuJmfxdiV7O+3AGZoES0YFTSvipM4HnVh+SUmIehsL?= =?iso-8859-1?Q?iYIz/iWJtOp6NV08Ih+ktj0MEDKQR3yhwyHzULqIgN6VPsEcWK9Wdgfk7f?= =?iso-8859-1?Q?wkuTMRQ75Q31Q6e8du+YQsPBWDytlyg1Nz6AOq4SeuFu0QBjKvMF9RGhZb?= =?iso-8859-1?Q?oK57HVZ4ZKk63Qq3rCTix+aD/UvTpV0zndTcwth9zWblWSoxoby/MY2Eju?= =?iso-8859-1?Q?BBQ9ovHA8X2qtKYb7fjVwJVsGn5QDJsFhTXNvXq9FDUFST8pvAjIhipJ59?= =?iso-8859-1?Q?vAPc2f952M/ZVodk6GFtA3TIWtg2CJy7e6/hNcT6HbXxe9k=3D?= x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?iso-8859-1?Q?xUUg8A4AYh1WW1VxZaWVHDbOqwbZJcdhicIx44k7sIVQzwnA20zvmM7yVl?= =?iso-8859-1?Q?3KdTHKyHz1YCg4tRH3ArOdDWBYY++wEWcrTw5KpGeDaacq0JISLw2t7vr/?= =?iso-8859-1?Q?ojGj91UWkjv+CQ2JMCGrQGaFh7AP30WN8QFkKQqYqQdLUdOibkltzuKgei?= =?iso-8859-1?Q?WDojaxAZfvdEGelISOpDp+hBPq2V05++MsXCAFMlJcXZOSVAoPau+WyvDg?= =?iso-8859-1?Q?WQOQTmulC8yfkxkBE7ZcySa/i8JdZ5n9f0wv1rwM5hmoxthKxD7klfLdN0?= =?iso-8859-1?Q?CbphK5MhEQbCukXtrCarQftcTnQks6nQbWLQ/XtwWuaqGnMOmEvgEfqMFL?= =?iso-8859-1?Q?QdBsIUwB3rqCAnwWzdgj/SkvnbDqrNY2vXxo3bYw3o0G8GNs+Yle9/GxkM?= =?iso-8859-1?Q?G/aXINipoW8Vn4n5yfjmMlQukwBLgUhCeSZSudVgbQCdSqjOJlUBZUYF1k?= =?iso-8859-1?Q?90hCfL/bHDPHrjXanS8liXVLZteZpx9/SwfzgcIPLi1mlzM/dOehIpy8Tb?= =?iso-8859-1?Q?w8ebQ7AbX9E26ejOsuFOc+6SlxbKkzzhDB8HNqyjuYRTzjrUL+Jg/nJyPg?= =?iso-8859-1?Q?/IPPoxK1jso50maTDBwu+aM60Ki8JhQEHrgMynz/0LKEopayfWcRohtHxR?= =?iso-8859-1?Q?smd7/i25DkE4IDtlRkSbegs2tk2bmdpaPe7COvF7RBJ1pj061uYsMSDS1+?= =?iso-8859-1?Q?pAJZF4ECgjmhc0eds2gNUfIXHnTFFJjdJFuI8pzbi3+HYZoATCmauDXco8?= =?iso-8859-1?Q?h882hVhdx+/MUvWhmK2EwThaWNZGmOFlp0BPgjiJ3CoLJ5ag6yD069hHVi?= =?iso-8859-1?Q?/WhhPoqf9R7pyFJ2G4EmhyJO1q4jNs4Yjf4D+F91y+OlE2Kzhy1Z3XKDD8?= =?iso-8859-1?Q?+ePzZx0FC42mcSBgcQPe3jlimyOEhU0+LLeIX6aQulyMI1+jxsvN8MN3bK?= =?iso-8859-1?Q?9iY9S8K0nOL2JbeLUfb7C6OYvIpUI3l7T/mLFC6bbhsK5XqcwjpOOyo5E+?= =?iso-8859-1?Q?m1p9dZGYP6SW046eUz8oNZpDtEF3r32yN802i+gmKfNnHVKjXkTRjlJLVz?= =?iso-8859-1?Q?vX3fJQVWDq3Gg3tFZttkiVUT79R33QGB2RXLMHP9c0JZSEw4a75FQD45FK?= =?iso-8859-1?Q?L2pWPPt6aoMsR7xZv8gqR6PNXkwG9ja3gC8D6zojfscGn9XqYSNIfPKC6Z?= =?iso-8859-1?Q?2vOqLzkqCVxFA6xQZvBJQBL4wD3cYZXLXSMzWql/J86pBadz4ThGLmgr1h?= =?iso-8859-1?Q?fupPuNVgMTtnZT347Uv954HN0pXQ4bUOAjzPfrjYkkSPrS+zs9it6RLA9T?= =?iso-8859-1?Q?Nj6MVKZumNiOKO5SihHTK41E5o+qNcjLkGf6X0jKc7h3IW+AlsVvvIX6oJ?= =?iso-8859-1?Q?BiyX7IjhmzrW/kKOv8SuzDUJZ240lEqj9n3ixGzr1Iv/FWOqWHIiU6l5Qv?= =?iso-8859-1?Q?uPpDroksjgsrD3i3?= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Archived-By: MIME-Version: 1.0 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SA3PR05MB10385.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: 6f74eb51-4ead-4e3e-a0f2-08df3579f5e7 X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Oct 2026 05:03:24.2107 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR05MB8214 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 2C8BA80004 X-Stat-Signature: 7h3ntxxnooxryk5shfc88wyzhhisxa5w X-Rspam-User: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-HE-Tag: 1793250208-75779 X-HE-Meta: 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 lVdHnSbY 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Shakeel, thanks for the suggestion.=0A= =0A= Patch 1 now uses GFP_KERNEL_ACCOUNT for every dynamically allocated sops=0A= array. The first 64 operations still use the existing stack buffer. The=0A= fixed 1000-operation exemption and its conditional allocation flags have=0A= been removed.=0A= =0A= I compared this version with v4 in a 4-vCPU KVM guest. The benchmark proces= s=0A= was pinned to one vCPU. Each number is the median of 21 samples from three= =0A= fresh boots of each kernel. In a leaf memory cgroup, the changes were:=0A= =0A= 65 500 1000=0A= successful semop() +3.2% +3.2% +2.3%=0A= allocation-focused invalid semid +5.6% +9.1% +11.9%=0A= =0A= The invalid-sem-id case allocates and copies the operation array before=0A= returning EINVAL, so it emphasizes allocation overhead. The 64-operation=0A= stack controls changed by 0.9% and 0.5%, respectively. The already-accounte= d=0A= 1001-operation controls changed by 1.0% and -0.2%. Successful calls in the= =0A= root cgroup changed by at most 2.3%, including the controls.=0A= =0A= The sysctl handler parses writes into a temporary array while holding a=0A= per-IPC-namespace mutex. The mutex covers the snapshot, validation, and=0A= publication, so a failed write leaves the live settings unchanged and a=0A= partial write cannot restore fields from an older snapshot. The snapshot an= d=0A= publication use READ_ONCE() and WRITE_ONCE(), and reads continue through=0A= proc_dointvec(). The unused sem_check_semmni() helper is also removed.=0A= =0A= The UAPI warning about physical fragmentation is obsolete now that the=0A= operation array uses kvmalloc(). The header describes SEMOPM as the=0A= compiled-in default and retains the uniform <=3D INT_MAX range comment.=0A= =0A= Patches 2 and 3 are unchanged from v4 and retain Manfred's Reviewed-by tags= .=0A= The series is based on 7be4bc52fd9e ("Merge tag 'driver-core-7.4-rc1' of=0A= git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core").=0A= =0A= Validation completed on v5:=0A= =0A= - a W=3D1 full x86-64 bzImage build;=0A= - W=3D1 i386 builds of ipc/sem.o and ipc/ipc_sysctl.o;=0A= - three paired boots of v4 and v5 for the root/leaf memcg benchmark, with= =0A= seven samples for every path, cgroup, and operation count in each boot;= =0A= - initial and user-owned non-initial IPC namespaces rejected negative SEMOP= M,=0A= invalid SEMMNI, and malformed writes without changing live settings;=0A= - zero and positive SEMOPM values remained valid, including the 1000/1001= =0A= operation boundary;=0A= - concurrent partial, full, rejected, and successful sysctl writes complete= d=0A= without stale-snapshot overwrites;=0A= - successful, EAGAIN, EFAULT, signal-interruption, and IPC_RMID paths relea= sed=0A= operation-array allocations;=0A= - no BUG, WARNING, KASAN, UBSAN, or lock dependency report appeared;=0A= - strict checkpatch with the intentional CONST_STRUCT diagnostic ignored,= =0A= and patch application checks passed.=0A= =0A= Changes since v4:=0A= =0A= - account every dynamically allocated sops array with GFP_KERNEL_ACCOUNT, a= s=0A= Shakeel suggested;=0A= - remove the separate 1000-operation accounting threshold;=0A= - add root and leaf memory-cgroup benchmark results for 64, 65, 500, 1000,= =0A= and 1001 operations.=0A= =0A= V4:=0A= https://lore.kernel.org/r/cover.1793207025.git.x-professor@outlook.com=0A= =0A= Review of v4 1/3 by Shakeel:=0A= https://lore.kernel.org/r/565d855cbd81e0f49018da21df00ff0308f646b1.17932070= 25.git.x-professor@outlook.com=0A= =0A= Yingjie Wang (3):=0A= ipc/sem: account dynamically allocated sops arrays to memcg=0A= ipc/sem: reject negative SEMOPM values=0A= ipc/sem: remove obsolete SEMOPM fragmentation warning=0A= =0A= include/linux/ipc_namespace.h | 3 +++=0A= include/uapi/linux/sem.h | 7 +++----=0A= ipc/ipc_sysctl.c | 35 ++++++++++++++++++++++++++---------=0A= ipc/sem.c | 3 ++-=0A= ipc/util.h | 9 ---------=0A= 5 files changed, 34 insertions(+), 23 deletions(-)=0A= =0A= =0A= base-commit: 7be4bc52fd9e0e55dc9a2e0232b89427d2c4b614=0A= -- =0A= 2.43.0=0A= =0A=