Hi Eyal, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on nf-next/master] url: https://github.com/0day-ci/linux/commits/Eyal-Birger/netfilter-conntrack-... base: https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next.git master config: hexagon-randconfig-r045-20211121 (attached as .config) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/2e10f30e82a92d09c72cfcd3e659cd239... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Eyal-Birger/netfilter-conntrack-configurable-conntrack-gc-scan-interval/20211121-022522 git checkout 2e10f30e82a92d09c72cfcd3e659cd2395bf3e3e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): unsigned long next_run = max(nf_conntrack_gc_scan_interval, HZ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:52:19: note: expanded from macro 'max' #define max(x, y) __careful_cmp(x, y, >) ^~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp' __builtin_choose_expr(__safe_cmp(x, y), \ ^~~~~~~~~~~~~~~~ include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp' (__typecheck(x, y) && __no_side_effects(x, y)) ^~~~~~~~~~~~~~~~~ include/linux/minmax.h:20:28: note: expanded from macro '__typecheck' (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~ 1 warning generated. vim +1427 net/netfilter/nf_conntrack_core.c 1422 1423 static void gc_worker(struct work_struct *work) 1424 { 1425 unsigned long end_time = jiffies + GC_SCAN_MAX_DURATION; 1426 unsigned int i, hashsz, nf_conntrack_max95 = 0; 1428 struct conntrack_gc_work *gc_work; 1429 gc_work = container_of(work, struct conntrack_gc_work, dwork.work); 1430 1431 i = gc_work->next_bucket; 1432 if (gc_work->early_drop) 1433 nf_conntrack_max95 = nf_conntrack_max / 100u * 95u; 1434 1435 do { 1436 struct nf_conntrack_tuple_hash *h; 1437 struct hlist_nulls_head *ct_hash; 1438 struct hlist_nulls_node *n; 1439 struct nf_conn *tmp; 1440 1441 rcu_read_lock(); 1442 1443 nf_conntrack_get_ht(&ct_hash, &hashsz); 1444 if (i >= hashsz) { 1445 rcu_read_unlock(); 1446 break; 1447 } 1448 1449 hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[i], hnnode) { 1450 struct nf_conntrack_net *cnet; 1451 struct net *net; 1452 1453 tmp = nf_ct_tuplehash_to_ctrack(h); 1454 1455 if (test_bit(IPS_OFFLOAD_BIT, &tmp->status)) { 1456 nf_ct_offload_timeout(tmp); 1457 continue; 1458 } 1459 1460 if (nf_ct_is_expired(tmp)) { 1461 nf_ct_gc_expired(tmp); 1462 continue; 1463 } 1464 1465 if (nf_conntrack_max95 == 0 || gc_worker_skip_ct(tmp)) 1466 continue; 1467 1468 net = nf_ct_net(tmp); 1469 cnet = nf_ct_pernet(net); 1470 if (atomic_read(&cnet->count) < nf_conntrack_max95) 1471 continue; 1472 1473 /* need to take reference to avoid possible races */ 1474 if (!atomic_inc_not_zero(&tmp->ct_general.use)) 1475 continue; 1476 1477 if (gc_worker_skip_ct(tmp)) { 1478 nf_ct_put(tmp); 1479 continue; 1480 } 1481 1482 if (gc_worker_can_early_drop(tmp)) 1483 nf_ct_kill(tmp); 1484 1485 nf_ct_put(tmp); 1486 } 1487 1488 /* could check get_nulls_value() here and restart if ct 1489 * was moved to another chain. But given gc is best-effort 1490 * we will just continue with next hash slot. 1491 */ 1492 rcu_read_unlock(); 1493 cond_resched(); 1494 i++; 1495 1496 if (time_after(jiffies, end_time) && i < hashsz) { 1497 gc_work->next_bucket = i; 1498 next_run = 0; 1499 break; 1500 } 1501 } while (i < hashsz); 1502 1503 if (gc_work->exiting) 1504 return; 1505 1506 /* 1507 * Eviction will normally happen from the packet path, and not 1508 * from this gc worker. 1509 * 1510 * This worker is only here to reap expired entries when system went 1511 * idle after a busy period. 1512 */ 1513 if (next_run) { 1514 gc_work->early_drop = false; 1515 gc_work->next_bucket = 0; 1516 } 1517 queue_delayed_work(system_power_efficient_wq, &gc_work->dwork, next_run); 1518 } 1519 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org