Hi Xiangning", Thank you for the patch! Perhaps something to improve: [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/YU-Xiangning/Lockless-Token-Buck... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 8cb601f15886f6d05479e46913d954e9ff237312 config: parisc-randconfig-s032-20200709 (attached as .config) compiler: hppa-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-37-gc9676a3b-dirty # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=parisc 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 >>) net/sched/sch_ltb.c:327:35: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got struct ltb_pcpu_data * @@ net/sched/sch_ltb.c:327:35: sparse: expected void const [noderef] __percpu *__vpp_verify net/sched/sch_ltb.c:327:35: sparse: got struct ltb_pcpu_data * net/sched/sch_ltb.c:752:17: sparse: sparse: incompatible types in comparison expression (different address spaces): net/sched/sch_ltb.c:752:17: sparse: struct ltb_class [noderef] __rcu * net/sched/sch_ltb.c:752:17: sparse: struct ltb_class * net/sched/sch_ltb.c:988:16: sparse: sparse: incompatible types in comparison expression (different address spaces): net/sched/sch_ltb.c:988:16: sparse: struct ltb_class [noderef] __rcu * net/sched/sch_ltb.c:988:16: sparse: struct ltb_class * net/sched/sch_ltb.c:1000:16: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got struct ltb_pcpu_data * @@ net/sched/sch_ltb.c:1000:16: sparse: expected void const [noderef] __percpu *__vpp_verify net/sched/sch_ltb.c:1000:16: sparse: got struct ltb_pcpu_data * net/sched/sch_ltb.c:1029:16: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got struct ltb_pcpu_data * @@ net/sched/sch_ltb.c:1029:16: sparse: expected void const [noderef] __percpu *__vpp_verify net/sched/sch_ltb.c:1029:16: sparse: got struct ltb_pcpu_data * net/sched/sch_ltb.c:1047:29: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got struct ltb_pcpu_data * @@ net/sched/sch_ltb.c:1047:29: sparse: expected void const [noderef] __percpu *__vpp_verify net/sched/sch_ltb.c:1047:29: sparse: got struct ltb_pcpu_data * net/sched/sch_ltb.c:1072:27: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got struct ltb_pcpu_data * @@ net/sched/sch_ltb.c:1072:27: sparse: expected void const [noderef] __percpu *__vpp_verify net/sched/sch_ltb.c:1072:27: sparse: got struct ltb_pcpu_data * net/sched/sch_ltb.c:1141:17: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got struct ltb_pcpu_data * @@ net/sched/sch_ltb.c:1141:17: sparse: expected void const [noderef] __percpu *__vpp_verify net/sched/sch_ltb.c:1141:17: sparse: got struct ltb_pcpu_data * net/sched/sch_ltb.c:1142:17: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got struct ltb_pcpu_data * @@ net/sched/sch_ltb.c:1142:17: sparse: expected void const [noderef] __percpu *__vpp_verify net/sched/sch_ltb.c:1142:17: sparse: got struct ltb_pcpu_data * net/sched/sch_ltb.c:1168:46: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got struct ltb_pcpu_data * @@ net/sched/sch_ltb.c:1168:46: sparse: expected void const [noderef] __percpu *__vpp_verify net/sched/sch_ltb.c:1168:46: sparse: got struct ltb_pcpu_data * net/sched/sch_ltb.c:1176:32: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void [noderef] __percpu *__pdata @@ got struct ltb_pcpu_data *pcpu_data @@ net/sched/sch_ltb.c:1176:32: sparse: expected void [noderef] __percpu *__pdata net/sched/sch_ltb.c:1176:32: sparse: got struct ltb_pcpu_data *pcpu_data vim +231 net/sched/sch_ltb.c 181 182 static int ltb_drain(struct ltb_class *cl) 183 { 184 struct ltb_sched *ltb = qdisc_priv(cl->root_qdisc); 185 struct ltb_pcpu_sched *pcpu_q; 186 bool need_watchdog = false; 187 unsigned int npkts, bytes; 188 unsigned long now = NOW(); 189 struct cpumask cpumask; 190 struct sk_buff *skb; 191 s64 timestamp; 192 int cpu; 193 194 npkts = 0; 195 bytes = 0; 196 cpumask_clear(&cpumask); 197 while (kfifo_peek(&cl->drain_queue, &skb) > 0) { 198 int len = qdisc_pkt_len(skb); 199 200 if (cl->curr_interval != now) { 201 cl->curr_interval = now; 202 timestamp = ktime_get_ns(); 203 cl->bw_measured = (cl->stat_bytes - cl->last_bytes) * 204 NSEC_PER_SEC / (timestamp - cl->last_timestamp); 205 cl->last_bytes = cl->stat_bytes; 206 cl->last_timestamp = timestamp; 207 cl->bw_used = 0; 208 } else if (len + cl->bw_used > cl->maxbw) { 209 need_watchdog = true; 210 break; 211 } 212 kfifo_skip(&cl->drain_queue); 213 cl->bw_used += len; 214 215 /* Fanout */ 216 cpu = ltb_skb_cb(skb)->cpu; 217 ltb_skb_cb(skb)->cpu = 0; 218 if (unlikely(kfifo_put(&cl->fanout_queues[cpu], skb) == 0)) { 219 kfree_skb(skb); 220 atomic64_inc(&cl->stat_drops); 221 } else { 222 /* Account for Generic Segmentation Offload(gso). */ 223 cl->stat_bytes += len; 224 cl->stat_packets += skb_is_gso(skb) ? 225 skb_shinfo(skb)->gso_segs : 1; 226 cpumask_set_cpu(cpu, &cpumask); 227 } 228 } 229 230 for_each_cpu(cpu, &cpumask) { 232 233 pcpu_q = (struct ltb_pcpu_sched *)qdisc_priv(q); 234 if (!(q->state & __QDISC_STATE_SCHED) && !qdisc_is_running(q)) 235 irq_work_queue_on(&pcpu_q->fanout_irq_work, cpu); 236 } 237 238 return need_watchdog; 239 } 240 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org