tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: cfef018a5efc728040e938c270bbc68fc8124d33 commit: 23eaaf813799b52b3df39373c4c82d81a0988816 [14766/18252] igc: Add support for PTP getcrosststamp() config: x86_64-randconfig-s022-20210815 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-348-gf0e6938b-dirty # https://github.com/intel/linux-intel-lts/commit/23eaaf813799b52b3df39373c... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.4/yocto git checkout 23eaaf813799b52b3df39373c4c82d81a0988816 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/ethernet/intel/igc/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +457 drivers/net/ethernet/intel/igc/igc_ptp.c 441 442 static void igc_ptm_gather_report(struct igc_adapter *adapter) 443 { 444 struct igc_hw *hw = &adapter->hw; 445 u32 t2_curr_h, t2_curr_l; 446 ktime_t t1, t2_curr; 447 448 t1 = ktime_set(rd32(IGC_PTM_T1_TIM0_H), 449 rd32(IGC_PTM_T1_TIM0_L)); 450 451 t2_curr_l = rd32(IGC_PTM_CURR_T2_L); 452 t2_curr_h = rd32(IGC_PTM_CURR_T2_H); 453 454 /* FIXME: There's an ambiguity on what endianness some PCIe PTM 455 * messages should use. Find a more robust way to handle this. 456 */ 458 459 t2_curr = ((s64)t2_curr_h << 32 | t2_curr_l); 460 461 wr32(IGC_PTM_STAT, IGC_PTM_STAT_VALID); 462 463 mutex_lock(&adapter->ptm_time_lock); 464 465 /* Because get_device_system_crosststamp() requires that the 466 * historic timestamp is before the PTM device/host 467 * timestamps, we keep track of the current and previous 468 * snapshot (historic timestamp). 469 */ 470 memcpy(&adapter->prev_snapshot, 471 &adapter->curr_snapshot, sizeof(adapter->prev_snapshot)); 472 ktime_get_snapshot(&adapter->curr_snapshot); 473 474 adapter->ptm_device_time = t1; 475 adapter->ptm_host_time = igc_device_tstamp_to_system(t2_curr); 476 mutex_unlock(&adapter->ptm_time_lock); 477 478 mod_delayed_work(system_wq, &adapter->ptm_report, 479 msecs_to_jiffies(IGC_PTM_CYCLE_TIME_MSECS)); 480 } 481 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org