tree: https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git dev-queue head: 3f69b6741396fada730c8a1ccc0bfa8c771b9dab commit: cf576c848e1829ce268474d0510dab01a4235e36 [50/96] igc: Add support for PTP getcrosststamp() config: i386-randconfig-s002-20201113 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-107-gaf3512a6-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git/comm... git remote add tnguy-next-queue https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git git fetch --no-tags tnguy-next-queue dev-queue git checkout cf576c848e1829ce268474d0510dab01a4235e36 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 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 +450 drivers/net/ethernet/intel/igc/igc_ptp.c 434 435 static void igc_ptm_gather_report(struct igc_adapter *adapter) 436 { 437 struct igc_hw *hw = &adapter->hw; 438 u32 t2_curr_h, t2_curr_l; 439 ktime_t t1, t2_curr; 440 441 t1 = ktime_set(rd32(IGC_PTM_T1_TIM0_H), 442 rd32(IGC_PTM_T1_TIM0_L)); 443 444 t2_curr_l = rd32(IGC_PTM_CURR_T2_L); 445 t2_curr_h = rd32(IGC_PTM_CURR_T2_H); 446 447 /* FIXME: There's an ambiguity on what endianness some PCIe PTM 448 * messages should use. Find a more robust way to handle this. 449 */ 451 452 t2_curr = ((s64)t2_curr_h << 32 | t2_curr_l); 453 454 wr32(IGC_PTM_STAT, IGC_PTM_STAT_VALID); 455 456 mutex_lock(&adapter->ptm_time_lock); 457 458 /* Because get_device_system_crosststamp() requires that the 459 * historic timestamp is before the PTM device/host 460 * timestamps, we keep track of the current and previous 461 * snapshot (historic timestamp). 462 */ 463 memcpy(&adapter->prev_snapshot, 464 &adapter->curr_snapshot, sizeof(adapter->prev_snapshot)); 465 ktime_get_snapshot(&adapter->curr_snapshot); 466 467 adapter->ptm_device_time = t1; 468 adapter->ptm_host_time = igc_device_tstamp_to_system(t2_curr); 469 mutex_unlock(&adapter->ptm_time_lock); 470 471 mod_delayed_work(system_wq, &adapter->ptm_report, 472 msecs_to_jiffies(IGC_PTM_CYCLE_TIME_MSECS)); 473 } 474 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org