tree: https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git dev-queue head: 3f69b6741396fada730c8a1ccc0bfa8c771b9dab commit: 44f0d25c501202f999773c94ee0a11d7e7376b76 [73/96] igc: Fix igc_ptp_rx_pktstamp() 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 44f0d25c501202f999773c94ee0a11d7e7376b76 # 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 >>)" drivers/net/ethernet/intel/igc/igc_ptp.c:184:24: sparse: sparse: cast to restricted __le32 drivers/net/ethernet/intel/igc/igc_ptp.c:458:21: sparse: sparse: cast to restricted __be32 drivers/net/ethernet/intel/igc/igc_ptp.c:458:21: sparse: sparse: cast to restricted __be32 drivers/net/ethernet/intel/igc/igc_ptp.c:458:21: sparse: sparse: cast to restricted __be32 drivers/net/ethernet/intel/igc/igc_ptp.c:458:21: sparse: sparse: cast to restricted __be32 drivers/net/ethernet/intel/igc/igc_ptp.c:458:21: sparse: sparse: cast to restricted __be32 drivers/net/ethernet/intel/igc/igc_ptp.c:458:21: sparse: sparse: cast to restricted __be32 vim +183 drivers/net/ethernet/intel/igc/igc_ptp.c 155 156 /** 157 * igc_ptp_rx_pktstamp - Retrieve timestamp from Rx packet buffer 158 * @q_vector: Pointer to interrupt specific structure 159 * @va: Pointer to address containing Rx buffer 160 * @skb: Buffer containing timestamp and packet 161 * 162 * This function retrieves the timestamp saved in the beginning of packet 163 * buffer. While two timestamps are available, one in timer0 reference and the 164 * other in timer1 reference, this function considers only the timestamp in 165 * timer0 reference. 166 */ 167 void igc_ptp_rx_pktstamp(struct igc_q_vector *q_vector, u32 *va, 168 struct sk_buff *skb) 169 { 170 struct igc_adapter *adapter = q_vector->adapter; 171 u64 regval; 172 int adjust; 173 174 /* Timestamps are saved in little endian at the beginning of the packet 175 * buffer following the layout: 176 * 177 * DWORD: | 0 | 1 | 2 | 3 | 178 * Field: | Timer1 SYSTIML | Timer1 SYSTIMH | Timer0 SYSTIML | Timer0 SYSTIMH | 179 * 180 * SYSTIML holds the nanoseconds part while SYSTIMH holds the seconds 181 * part of the timestamp. 182 */ 184 regval |= (u64)le32_to_cpu(va[3]) << 32; 185 igc_ptp_systim_to_hwtstamp(adapter, skb_hwtstamps(skb), regval); 186 187 /* Adjust timestamp for the RX latency based on link speed */ 188 switch (adapter->link_speed) { 189 case SPEED_10: 190 adjust = IGC_I225_RX_LATENCY_10; 191 break; 192 case SPEED_100: 193 adjust = IGC_I225_RX_LATENCY_100; 194 break; 195 case SPEED_1000: 196 adjust = IGC_I225_RX_LATENCY_1000; 197 break; 198 case SPEED_2500: 199 adjust = IGC_I225_RX_LATENCY_2500; 200 break; 201 default: 202 adjust = 0; 203 netdev_warn_once(adapter->netdev, "Imprecise timestamp\n"); 204 break; 205 } 206 skb_hwtstamps(skb)->hwtstamp = 207 ktime_sub_ns(skb_hwtstamps(skb)->hwtstamp, adjust); 208 } 209 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org