tree: https://github.com/intel/linux-intel-lts.git 5.10/preempt-rt head: 92cafac7cc9c1af94b9b5b61e35fbbd39d4f5854 commit: 26a890b883303c93193cca69d5a096f550f93c6d [9797/17820] igc: Add support for DMA timestamp for non-PTP packets config: powerpc-randconfig-c003-20211021 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 3cea2505fd8d99a9ba0cb625aecfe28a47c4e3f8) 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/intel/linux-intel-lts/commit/26a890b883303c93193cca69d... git remote add intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-lts 5.10/preempt-rt git checkout 26a890b883303c93193cca69d5a096f550f93c6d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from drivers/net/ethernet/intel/igc/igc_ptp.c:4: In file included from drivers/net/ethernet/intel/igc/igc.h:7: In file included from include/linux/kobject.h:19: In file included from include/linux/list.h:9: In file included from include/linux/kernel.h:12: In file included from include/linux/bitops.h:29: 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>:310:9: note: previous definition is here #define __lwsync __builtin_ppc_lwsync ^ u32 sec, nsec; ^ 2 warnings generated. vim +/nsec +438 drivers/net/ethernet/intel/igc/igc_ptp.c 432 433 static void igc_ptp_dma_time_to_hwtstamp(struct igc_adapter *adapter, 434 struct skb_shared_hwtstamps *hwtstamps, 435 u64 systim) 436 { 437 struct igc_hw *hw = &adapter->hw; 439 440 /* FIXME: use a workqueue to read these values to avoid 441 * reading these registers in the hot path. 442 */ 443 nsec = rd32(IGC_SYSTIML); 444 sec = rd32(IGC_SYSTIMH); 445 446 switch (adapter->hw.mac.type) { 447 case igc_i225: 448 memset(hwtstamps, 0, sizeof(*hwtstamps)); 449 450 /* HACK */ 451 hwtstamps->hwtstamp = ktime_set(sec, systim & 0xFFFFFFFF); 452 break; 453 default: 454 break; 455 } 456 } 457 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org