* net/ipv4/tcp.c:6412:41: sparse: sparse: incorrect type in argument 1 (different address spaces)
@ 2026-10-05 20:48 kernel test robot
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From: kernel test robot @ 2026-10-05 20:48 UTC (permalink / raw)
To: Fernando Fernandez Mancera; +Cc: oe-kbuild-all, 0day robot
tree: https://github.com/intel-lab-lkp/linux/commits/Fernando-Fernandez-Mancera/ipv4-introduce-CONFIG_IPV4-to-decouple-the-IPv4-stack/20260930-155244
head: 2f5320cab6ec71a709d940eb2e33b5492af479ff
commit: c6f3b3a9aa158d590b48d60fe76cc2041c0dd1b6 tcp: move protocol agnostic TCP functions out of tcp_ipv4.c
date: 5 days ago
config: arm64-randconfig-r2307-20261005 (https://download.01.org/0day-ci/archive/20261005/202610052224.umZErm7e-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project dbeca9a3a3ba0b46471efb339b0ea8f2194f6f68)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261005/202610052224.umZErm7e-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610052224.umZErm7e-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
>> net/ipv4/tcp.c:6412:41: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const *data @@ got struct tcp_congestion_ops const [noderef] __rcu *tcp_congestion_control @@
net/ipv4/tcp.c:6412:41: sparse: expected void const *data
net/ipv4/tcp.c:6412:41: sparse: got struct tcp_congestion_ops const [noderef] __rcu *tcp_congestion_control
>> net/ipv4/tcp.c:6538:45: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const *data @@ got struct tcp_congestion_ops const [noderef] __rcu *extern [addressable] [toplevel] tcp_congestion_control @@
net/ipv4/tcp.c:6538:45: sparse: expected void const *data
net/ipv4/tcp.c:6538:45: sparse: got struct tcp_congestion_ops const [noderef] __rcu *extern [addressable] [toplevel] tcp_congestion_control
>> net/ipv4/tcp.c:6542:50: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct tcp_congestion_ops const [noderef] __rcu *tcp_congestion_control @@ got struct tcp_congestion_ops * @@
net/ipv4/tcp.c:6542:50: sparse: expected struct tcp_congestion_ops const [noderef] __rcu *tcp_congestion_control
net/ipv4/tcp.c:6542:50: sparse: got struct tcp_congestion_ops *
>> net/ipv4/tcp.c:6413:41: sparse: sparse: dereference of noderef expression
>> net/ipv4/tcp.c:6413:41: sparse: sparse: dereference of noderef expression
net/ipv4/tcp.c:6539:45: sparse: sparse: dereference of noderef expression
net/ipv4/tcp.c:6539:45: sparse: sparse: dereference of noderef expression
vim +6412 net/ipv4/tcp.c
6408
6409 static void __net_exit tcp_sk_exit(struct net *net)
6410 {
6411 if (net->ipv4.tcp_congestion_control)
> 6412 bpf_module_put(net->ipv4.tcp_congestion_control,
> 6413 net->ipv4.tcp_congestion_control->owner);
6414 }
6415
6416 static void __net_init tcp_set_hashinfo(struct net *net)
6417 {
6418 struct inet_hashinfo *hinfo;
6419 unsigned int ehash_entries;
6420 struct net *old_net;
6421
6422 if (net_eq(net, &init_net))
6423 goto fallback;
6424
6425 old_net = current->nsproxy->net_ns;
6426 ehash_entries = READ_ONCE(old_net->ipv4.sysctl_tcp_child_ehash_entries);
6427 if (!ehash_entries)
6428 goto fallback;
6429
6430 ehash_entries = roundup_pow_of_two(ehash_entries);
6431 hinfo = inet_pernet_hashinfo_alloc(&tcp_hashinfo, ehash_entries);
6432 if (!hinfo) {
6433 pr_warn("Failed to allocate TCP ehash (entries: %u) "
6434 "for a netns, fallback to the global one\n",
6435 ehash_entries);
6436 fallback:
6437 hinfo = &tcp_hashinfo;
6438 ehash_entries = tcp_hashinfo.ehash_mask + 1;
6439 }
6440
6441 net->ipv4.tcp_death_row.hashinfo = hinfo;
6442 net->ipv4.tcp_death_row.sysctl_max_tw_buckets = ehash_entries / 2;
6443 net->ipv4.sysctl_max_syn_backlog = max(128U, ehash_entries / 128);
6444 }
6445
6446 static int __net_init tcp_sk_init(struct net *net)
6447 {
6448 net->ipv4.sysctl_tcp_ecn = TCP_ECN_IN_ECN_OUT_NOECN;
6449 net->ipv4.sysctl_tcp_ecn_option = TCP_ACCECN_OPTION_FULL;
6450 net->ipv4.sysctl_tcp_ecn_option_beacon = TCP_ACCECN_OPTION_BEACON;
6451 net->ipv4.sysctl_tcp_ecn_fallback = 1;
6452
6453 net->ipv4.sysctl_tcp_base_mss = TCP_BASE_MSS;
6454 net->ipv4.sysctl_tcp_min_snd_mss = TCP_MIN_SND_MSS;
6455 net->ipv4.sysctl_tcp_probe_threshold = TCP_PROBE_THRESHOLD;
6456 net->ipv4.sysctl_tcp_probe_interval = TCP_PROBE_INTERVAL;
6457 net->ipv4.sysctl_tcp_mtu_probe_floor = TCP_MIN_SND_MSS;
6458
6459 net->ipv4.sysctl_tcp_keepalive_time = TCP_KEEPALIVE_TIME;
6460 net->ipv4.sysctl_tcp_keepalive_probes = TCP_KEEPALIVE_PROBES;
6461 net->ipv4.sysctl_tcp_keepalive_intvl = TCP_KEEPALIVE_INTVL;
6462
6463 net->ipv4.sysctl_tcp_syn_retries = TCP_SYN_RETRIES;
6464 net->ipv4.sysctl_tcp_synack_retries = TCP_SYNACK_RETRIES;
6465 net->ipv4.sysctl_tcp_syncookies = 1;
6466 net->ipv4.sysctl_tcp_reordering = TCP_FASTRETRANS_THRESH;
6467 net->ipv4.sysctl_tcp_retries1 = TCP_RETR1;
6468 net->ipv4.sysctl_tcp_retries2 = TCP_RETR2;
6469 net->ipv4.sysctl_tcp_orphan_retries = 0;
6470 net->ipv4.sysctl_tcp_fin_timeout = TCP_FIN_TIMEOUT;
6471 net->ipv4.sysctl_tcp_notsent_lowat = UINT_MAX;
6472 net->ipv4.sysctl_tcp_tw_reuse = 2;
6473 net->ipv4.sysctl_tcp_tw_reuse_delay = 1 * MSEC_PER_SEC;
6474 net->ipv4.sysctl_tcp_no_ssthresh_metrics_save = 1;
6475
6476 refcount_set(&net->ipv4.tcp_death_row.tw_refcount, 1);
6477 tcp_set_hashinfo(net);
6478
6479 net->ipv4.sysctl_tcp_sack = 1;
6480 net->ipv4.sysctl_tcp_window_scaling = 1;
6481 net->ipv4.sysctl_tcp_timestamps = 1;
6482 net->ipv4.sysctl_tcp_early_retrans = 3;
6483 net->ipv4.sysctl_tcp_recovery = TCP_RACK_LOSS_DETECTION;
6484 net->ipv4.sysctl_tcp_slow_start_after_idle = 1; /* By default, RFC2861 behavior. */
6485 net->ipv4.sysctl_tcp_retrans_collapse = 1;
6486 net->ipv4.sysctl_tcp_max_reordering = 300;
6487 net->ipv4.sysctl_tcp_dsack = 1;
6488 net->ipv4.sysctl_tcp_app_win = 31;
6489 net->ipv4.sysctl_tcp_adv_win_scale = 1;
6490 net->ipv4.sysctl_tcp_frto = 2;
6491 net->ipv4.sysctl_tcp_moderate_rcvbuf = 1;
6492 net->ipv4.sysctl_tcp_rcvbuf_low_rtt = USEC_PER_MSEC;
6493 /* This limits the percentage of the congestion window which we
6494 * will allow a single TSO frame to consume. Building TSO frames
6495 * which are too large can cause TCP streams to be bursty.
6496 */
6497 net->ipv4.sysctl_tcp_tso_win_divisor = 3;
6498 /* Default TSQ limit of 4 MB */
6499 net->ipv4.sysctl_tcp_limit_output_bytes = 4 << 20;
6500
6501 /* rfc5961 challenge ack rate limiting, per net-ns, disabled by default. */
6502 net->ipv4.sysctl_tcp_challenge_ack_limit = INT_MAX;
6503
6504 net->ipv4.sysctl_tcp_min_tso_segs = 2;
6505 net->ipv4.sysctl_tcp_tso_rtt_log = 9; /* 2^9 = 512 usec */
6506 net->ipv4.sysctl_tcp_min_rtt_wlen = 300;
6507 net->ipv4.sysctl_tcp_autocorking = 1;
6508 net->ipv4.sysctl_tcp_invalid_ratelimit = HZ / 2;
6509 net->ipv4.sysctl_tcp_pacing_ss_ratio = 200;
6510 net->ipv4.sysctl_tcp_pacing_ca_ratio = 120;
6511 if (net != &init_net) {
6512 memcpy(net->ipv4.sysctl_tcp_rmem,
6513 init_net.ipv4.sysctl_tcp_rmem,
6514 sizeof(init_net.ipv4.sysctl_tcp_rmem));
6515 memcpy(net->ipv4.sysctl_tcp_wmem,
6516 init_net.ipv4.sysctl_tcp_wmem,
6517 sizeof(init_net.ipv4.sysctl_tcp_wmem));
6518 }
6519 net->ipv4.sysctl_tcp_comp_sack_delay_ns = NSEC_PER_MSEC;
6520 net->ipv4.sysctl_tcp_comp_sack_slack_ns = 10 * NSEC_PER_USEC;
6521 net->ipv4.sysctl_tcp_comp_sack_nr = 44;
6522 net->ipv4.sysctl_tcp_comp_sack_rtt_percent = 33;
6523 net->ipv4.sysctl_tcp_backlog_ack_defer = 1;
6524 net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE;
6525 net->ipv4.sysctl_tcp_fastopen_blackhole_timeout = 0;
6526 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
6527
6528 /* Set default values for PLB */
6529 net->ipv4.sysctl_tcp_plb_enabled = 0; /* Disabled by default */
6530 net->ipv4.sysctl_tcp_plb_idle_rehash_rounds = 3;
6531 net->ipv4.sysctl_tcp_plb_rehash_rounds = 12;
6532 net->ipv4.sysctl_tcp_plb_suspend_rto_sec = 60;
6533 /* Default congestion threshold for PLB to mark a round is 50% */
6534 net->ipv4.sysctl_tcp_plb_cong_thresh = (1 << TCP_PLB_SCALE) / 2;
6535
6536 /* Reno is always built in */
6537 if (!net_eq(net, &init_net) &&
> 6538 bpf_try_module_get(init_net.ipv4.tcp_congestion_control,
6539 init_net.ipv4.tcp_congestion_control->owner))
6540 net->ipv4.tcp_congestion_control = init_net.ipv4.tcp_congestion_control;
6541 else
> 6542 net->ipv4.tcp_congestion_control = &tcp_reno;
6543
6544 net->ipv4.sysctl_tcp_syn_linear_timeouts = 4;
6545 net->ipv4.sysctl_tcp_shrink_window = 0;
6546
6547 net->ipv4.sysctl_tcp_pingpong_thresh = 1;
6548 net->ipv4.sysctl_tcp_rto_min_us = jiffies_to_usecs(TCP_RTO_MIN);
6549 net->ipv4.sysctl_tcp_rto_max_ms = TCP_RTO_MAX_SEC * MSEC_PER_SEC;
6550
6551 return 0;
6552 }
6553
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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