From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.31]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 57FA8584C2; Tue, 21 Nov 2023 21:26:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="bE22+orp" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1700601967; x=1732137967; h=date:from:to:cc:subject:message-id:mime-version; bh=yWltos9U073xVdxGr9Xw4dPqFUsPE1sLwJOtk0Fu1Io=; b=bE22+orpDPI0RJQd3hVHnJjbLCQco3xuB8fmySvhXrpcFjP9qNDkCv6T 9ST8E1ylSSXcMhUS42Lk8C34i9F/GpomRbmvpc7hw9V3B5fAxf38QizKj a/gNDKoc2op81hD8DedtlBgEM0vSxQu/38VouwinX9vvO6UAUuUEuWxm0 6489EFVdj4Lc81LTIBijs0ShZ1o6Nlwtbmt3YIUpFWNnFJVICdsrwicCD W9//WHcGuL64+OmLzD9qMT4GvcjTBtFCrOTao8alHHLwh8TwKI0c8dNK2 882GOHLu5TmMRo5wQUjb6FTemHp3AIsJ/hpFVdcX8aj6MnH1ewMmthqwu w==; X-IronPort-AV: E=McAfee;i="6600,9927,10901"; a="456265164" X-IronPort-AV: E=Sophos;i="6.04,216,1695711600"; d="scan'208";a="456265164" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Nov 2023 13:26:05 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10901"; a="1098163044" X-IronPort-AV: E=Sophos;i="6.04,216,1695711600"; d="scan'208";a="1098163044" Received: from lkp-server02.sh.intel.com (HELO b8de5498638e) ([10.239.97.151]) by fmsmga005.fm.intel.com with ESMTP; 21 Nov 2023 13:26:01 -0800 Received: from kbuild by b8de5498638e with local (Exim 4.96) (envelope-from ) id 1r5YFr-0008Gw-0O; Tue, 21 Nov 2023 21:25:59 +0000 Date: Wed, 22 Nov 2023 05:25:49 +0800 From: kernel test robot To: Edward Cree Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, Jakub Kicinski , Andy Moreton , Simon Horman Subject: drivers/net/ethernet/sfc/selftest.c:48:16: warning: field ip within 'struct efx_loopback_payload::(anonymous at drivers/net/ethernet/sfc/selftest.c:46:2)' is less aligned than 'struct iphdr' and is usually due to 'struct efx_loopback_payload::(anonymous a... Message-ID: <202311220537.geMTr31W-lkp@intel.com> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi Edward, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 98b1cc82c4affc16f5598d4fa14b1858671b2263 commit: 55c1528f9b97ff3b7efad73e8f79627fc2efb298 sfc: fix field-spanning memcpy in selftest date: 4 months ago config: arm-randconfig-003-20231122 (https://download.01.org/0day-ci/archive/20231122/202311220537.geMTr31W-lkp@intel.com/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231122/202311220537.geMTr31W-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202311220537.geMTr31W-lkp@intel.com/ All warnings (new ones prefixed by >>): >> drivers/net/ethernet/sfc/selftest.c:48:16: warning: field ip within 'struct efx_loopback_payload::(anonymous at drivers/net/ethernet/sfc/selftest.c:46:2)' is less aligned than 'struct iphdr' and is usually due to 'struct efx_loopback_payload::(anonymous at drivers/net/ethernet/sfc/selftest.c:46:2)' being packed, which can lead to unaligned accesses [-Wunaligned-access] 48 | struct iphdr ip; | ^ >> drivers/net/ethernet/sfc/selftest.c:48:16: warning: field ip within 'struct efx_loopback_payload::(unnamed at drivers/net/ethernet/sfc/selftest.c:46:2)' is less aligned than 'struct iphdr' and is usually due to 'struct efx_loopback_payload::(unnamed at drivers/net/ethernet/sfc/selftest.c:46:2)' being packed, which can lead to unaligned accesses [-Wunaligned-access] 2 warnings generated. -- >> drivers/net/ethernet/sfc/falcon/selftest.c:45:16: warning: field ip within 'struct ef4_loopback_payload::(anonymous at drivers/net/ethernet/sfc/falcon/selftest.c:43:2)' is less aligned than 'struct iphdr' and is usually due to 'struct ef4_loopback_payload::(anonymous at drivers/net/ethernet/sfc/falcon/selftest.c:43:2)' being packed, which can lead to unaligned accesses [-Wunaligned-access] 45 | struct iphdr ip; | ^ >> drivers/net/ethernet/sfc/falcon/selftest.c:45:16: warning: field ip within 'struct ef4_loopback_payload::(unnamed at drivers/net/ethernet/sfc/falcon/selftest.c:43:2)' is less aligned than 'struct iphdr' and is usually due to 'struct ef4_loopback_payload::(unnamed at drivers/net/ethernet/sfc/falcon/selftest.c:43:2)' being packed, which can lead to unaligned accesses [-Wunaligned-access] 2 warnings generated. vim +48 drivers/net/ethernet/sfc/selftest.c 93e5dfa59b0e26 drivers/net/ethernet/sfc/selftest.c Ben Hutchings 2012-02-28 37 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 38 /* 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 39 * Loopback test packet structure 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 40 * 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 41 * The self-test should stress every RSS vector, and unfortunately 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 42 * Falcon only performs RSS on TCP/UDP packets. 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 43 */ 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 44 struct efx_loopback_payload { cf60ed46962992 drivers/net/ethernet/sfc/selftest.c Edward Cree 2023-06-23 45 char pad[2]; /* Ensures ip is 4-byte aligned */ 55c1528f9b97ff drivers/net/ethernet/sfc/selftest.c Edward Cree 2023-07-28 46 struct_group_attr(packet, __packed, 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 47 struct ethhdr header; 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 @48 struct iphdr ip; 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 49 struct udphdr udp; 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 50 __be16 iteration; 1d20a16062e771 drivers/net/ethernet/sfc/selftest.c David S. Miller 2015-04-17 51 char msg[64]; 55c1528f9b97ff drivers/net/ethernet/sfc/selftest.c Edward Cree 2023-07-28 52 ); cf60ed46962992 drivers/net/ethernet/sfc/selftest.c Edward Cree 2023-06-23 53 } __packed __aligned(4); 55c1528f9b97ff drivers/net/ethernet/sfc/selftest.c Edward Cree 2023-07-28 54 #define EFX_LOOPBACK_PAYLOAD_LEN \ 55c1528f9b97ff drivers/net/ethernet/sfc/selftest.c Edward Cree 2023-07-28 55 sizeof_field(struct efx_loopback_payload, packet) 3273c2e8c66a21 drivers/net/sfc/selftest.c Ben Hutchings 2008-05-07 56 :::::: The code at line 48 was first introduced by commit :::::: 3273c2e8c66a21ae1c53b0c730ee937c6efde7e2 [netdrvr] sfc: sfc: Add self-test support :::::: TO: Ben Hutchings :::::: CC: Jeff Garzik -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki