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Mon, 13 Oct 2025 15:32:38 +0000 Message-ID: <75df59a5-56d1-4938-919d-b9e9e2f81251@intel.com> Date: Mon, 13 Oct 2025 17:32:31 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [linux-next20250912] Build warnings at drivers/net/ethernet/intel/idpf/xdp.c:6 To: Venkat CC: Madhavan Srinivasan , Stephen Rothwell , , , , LKML , linuxppc-dev , Linux Next Mailing List References: <22ac36cb-1ba5-429b-85e0-4e3f2da1f87f@linux.ibm.com> <440ef1ad-6690-48e9-be02-1ccd69f6623e@intel.com> <3BDEECFD-5267-4453-B45B-07D3A1545D75@linux.ibm.com> From: Alexander Lobakin Content-Language: en-US In-Reply-To: <3BDEECFD-5267-4453-B45B-07D3A1545D75@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: TL2P290CA0005.ISRP290.PROD.OUTLOOK.COM (2603:1096:950:2::15) To DS0PR11MB8718.namprd11.prod.outlook.com (2603:10b6:8:1b9::20) 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: DS0PR11MB8718:EE_|SA2PR11MB4971:EE_ X-MS-Office365-Filtering-Correlation-Id: 800c8ffb-d764-48c5-20f0-08de0a6dbd6a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016|7053199007; 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It's not even a warning? >>> 28 | static inline void idpf_xdp_tx_xmit(struct libeth_xdp_tx_desc >>> desc, u32 i, >>> | ^~~~~~~~~~~~~~~~ >> >> Yes, I do pass 16-byte variables/structures directly. >> >> I would say this warning makes no sense, due to the following reasons: >> >> 1. IIRC the minimum required GCC version for building the latest kernel >> is way above 5. >> 2. This warning should appear only with `-Wabi`, which the upstream >> kernel never sets. > > Now, this warning is seen on upstream kernel also. Then how to reproduce it? I've never seen a single report from the upstream CI bots which would point out to such warning. Could RH enable some additional output by default in their GCC? > > Not sure if this is something we need to fix it or suppress the warning? There's nothing to fix nor suppress. > > Regards, > Venkat. > >> 3. Kernel is a self-contained project, this function is not uAPI, so we >> shouldn't care in general about backward ABI compatibility for purely >> in-kernel stuff. >> >> We have plenty of functions, mostly generic, which either passes or >> returns >= 16-byte objects, but I see this warning for the first time. >> Despite that my repo is attached to the open Intel CI bots infra which >> does daily builds on a good bunch of different architectures and >> toolchains (inc. GCC 8+). Thanks, Olek