tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: cfef018a5efc728040e938c270bbc68fc8124d33 commit: 12fc406ee6d446e71ab81fc11faa3b2ebe1095c4 [15479/18252] igc: Fix igc_ptp_rx_pktstamp() 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/12fc406ee6d446e71ab81fc11... 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 12fc406ee6d446e71ab81fc11faa3b2ebe1095c4 # 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 >>) drivers/net/ethernet/intel/igc/igc_ptp.c:461:24: sparse: sparse: cast to restricted __le32 drivers/net/ethernet/intel/igc/igc_ptp.c:742:21: sparse: sparse: cast to restricted __be32 drivers/net/ethernet/intel/igc/igc_ptp.c:742:21: sparse: sparse: cast to restricted __be32 drivers/net/ethernet/intel/igc/igc_ptp.c:742:21: sparse: sparse: cast to restricted __be32 drivers/net/ethernet/intel/igc/igc_ptp.c:742:21: sparse: sparse: cast to restricted __be32 drivers/net/ethernet/intel/igc/igc_ptp.c:742:21: sparse: sparse: cast to restricted __be32 drivers/net/ethernet/intel/igc/igc_ptp.c:742:21: sparse: sparse: cast to restricted __be32 vim +460 drivers/net/ethernet/intel/igc/igc_ptp.c 432 433 /** 434 * igc_ptp_rx_pktstamp - Retrieve timestamp from rx packet buffer 435 * @q_vector: Pointer to interrupt specific structure 436 * @va: Pointer to address containing Rx buffer 437 * @skb: Buffer containing timestamp and packet 438 * 439 * This function retrieves the timestamp saved in the beginning of packet 440 * buffer. While two timestamps are available, one in timer0 reference and the 441 * other in timer1 reference, this function considers only the timestamp in 442 * timer0 reference. 443 */ 444 void igc_ptp_rx_pktstamp(struct igc_q_vector *q_vector, u32 *va, 445 struct sk_buff *skb) 446 { 447 struct igc_adapter *adapter = q_vector->adapter; 448 u64 regval; 449 int adjust; 450 451 /* Timestamps are saved in little endian at the beginning of the packet 452 * buffer following the layout: 453 * 454 * DWORD: | 0 | 1 | 2 | 3 | 455 * Field: | Timer1 SYSTIML | Timer1 SYSTIMH | Timer0 SYSTIML | Timer0 SYSTIMH | 456 * 457 * SYSTIML holds the nanoseconds part while SYSTIMH holds the seconds 458 * part of the timestamp. 459 */ 461 regval |= (u64)le32_to_cpu(va[3]) << 32; 462 igc_ptp_systim_to_hwtstamp(adapter, skb_hwtstamps(skb), regval); 463 464 /* Adjust timestamp for the RX latency based on link speed */ 465 switch (adapter->link_speed) { 466 case SPEED_10: 467 adjust = IGC_I225_RX_LATENCY_10; 468 break; 469 case SPEED_100: 470 adjust = IGC_I225_RX_LATENCY_100; 471 break; 472 case SPEED_1000: 473 adjust = IGC_I225_RX_LATENCY_1000; 474 break; 475 case SPEED_2500: 476 adjust = IGC_I225_RX_LATENCY_2500; 477 break; 478 default: 479 adjust = 0; 480 netdev_warn_once(adapter->netdev, "Imprecise timestamp\n"); 481 break; 482 } 483 skb_hwtstamps(skb)->hwtstamp = 484 ktime_sub_ns(skb_hwtstamps(skb)->hwtstamp, adjust); 485 } 486 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org