Hi Felix, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on wireless-drivers-next/master] [also build test ERROR on wireless-drivers/master mac80211-next/master mac80211/master linus/master v5.14-rc1 next-20210713] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Felix-Fietkau/Ethernet-WLAN-hard... base: https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-ne... master config: powerpc-randconfig-r003-20210713 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe) 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 powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://github.com/0day-ci/linux/commit/c531997b320959473fb8b8e72d837aff5... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Felix-Fietkau/Ethernet-WLAN-hardware-flow-offloading-support-on-MT7622/20210714-001409 git checkout c531997b320959473fb8b8e72d837aff58970493 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/net/wireless/mediatek/mt76/ net/mac80211/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from net/mac80211/iface.c:13: In file included from include/linux/slab.h:15: In file included from include/linux/gfp.h:5: In file included from include/linux/mmdebug.h:5: In file included from include/linux/bug.h:5: In file included from arch/powerpc/include/asm/bug.h:109: In file included from include/asm-generic/bug.h:20: In file included from include/linux/kernel.h:12: In file included from include/linux/bitops.h:32: In file included from arch/powerpc/include/asm/bitops.h:62: arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined] #define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory") ^ <built-in>:309:9: note: previous definition is here #define __lwsync __builtin_ppc_lwsync ^ .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path, ^ 1 warning and 1 error generated. vim +/ieee80211_netdev_fill_forward_path +718 net/mac80211/iface.c 708 709 static const struct net_device_ops ieee80211_dataif_ops = { 710 .ndo_open = ieee80211_open, 711 .ndo_stop = ieee80211_stop, 712 .ndo_uninit = ieee80211_uninit, 713 .ndo_start_xmit = ieee80211_subif_start_xmit, 714 .ndo_set_rx_mode = ieee80211_set_multicast_list, 715 .ndo_set_mac_address = ieee80211_change_mac, 716 .ndo_select_queue = ieee80211_netdev_select_queue, 717 .ndo_get_stats64 = ieee80211_get_stats64, 719 }; 720 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org