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Date: Thu, 27 Oct 2022 04:41:57 +0800
From: kernel test robot <lkp@...el.com>
To: Martin Habets <habetsm.xilinx@...il.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>
Subject: drivers/net/ethernet/sfc/siena/selftest.c:46:15: warning: field ip
within 'struct efx_loopback_payload' is less aligned than 'struct iphdr' and
is usually due to 'struct efx_loopback_payload' being packed, which can lead
to unaligned accesses
Hi Martin,
First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 98555239e4c3aab1810d84073166eef6d54eeb3d
commit: c5a13c319e10e795850b61bc7e3447b08024be2e sfc: Add a basic Siena module
date: 6 months ago
config: arm-randconfig-r014-20221026
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c5a13c319e10e795850b61bc7e3447b08024be2e
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout c5a13c319e10e795850b61bc7e3447b08024be2e
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/net/ethernet/sfc/siena/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> drivers/net/ethernet/sfc/siena/selftest.c:46:15: warning: field ip within 'struct efx_loopback_payload' is less aligned than 'struct iphdr' and is usually due to 'struct efx_loopback_payload' being packed, which can lead to unaligned accesses [-Wunaligned-access]
struct iphdr ip;
^
1 warning generated.
vim +46 drivers/net/ethernet/sfc/siena/selftest.c
d48523cb88e070 Martin Habets 2022-05-09 37
d48523cb88e070 Martin Habets 2022-05-09 38 /*
d48523cb88e070 Martin Habets 2022-05-09 39 * Loopback test packet structure
d48523cb88e070 Martin Habets 2022-05-09 40 *
d48523cb88e070 Martin Habets 2022-05-09 41 * The self-test should stress every RSS vector, and unfortunately
d48523cb88e070 Martin Habets 2022-05-09 42 * Falcon only performs RSS on TCP/UDP packets.
d48523cb88e070 Martin Habets 2022-05-09 43 */
d48523cb88e070 Martin Habets 2022-05-09 44 struct efx_loopback_payload {
d48523cb88e070 Martin Habets 2022-05-09 45 struct ethhdr header;
d48523cb88e070 Martin Habets 2022-05-09 @46 struct iphdr ip;
d48523cb88e070 Martin Habets 2022-05-09 47 struct udphdr udp;
d48523cb88e070 Martin Habets 2022-05-09 48 __be16 iteration;
d48523cb88e070 Martin Habets 2022-05-09 49 char msg[64];
d48523cb88e070 Martin Habets 2022-05-09 50 } __packed;
d48523cb88e070 Martin Habets 2022-05-09 51
:::::: The code at line 46 was first introduced by commit
:::::: d48523cb88e0703055c1b33e61eb644a7976f92b sfc: Copy shared files needed for Siena (part 2)
:::::: TO: Martin Habets <martinh@...inx.com>
:::::: CC: Jakub Kicinski <kuba@...nel.org>
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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