tree: git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-linux-5.4.y head: 2bdb7c08718889073030390a1662111cd93df3fa commit: 2bdb7c08718889073030390a1662111cd93df3fa [1/1] Merge tag 'v5.4.54' of http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable into ti-linux-5.4.y config: mips-randconfig-r026-20201209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1968804ac726e7674d5de22bc2204b45857da344) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu git remote add ti git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git git fetch --no-tags ti ti-linux-5.4.y git checkout 2bdb7c08718889073030390a1662111cd93df3fa # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 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 >>): static void hsr_forward_do(struct hsr_frame_info *frame) ^ 1 warning generated. vim +/hsr_forward_do +521 net/hsr/hsr_forward.c 514cdd7471ff78 WingMan Kwok 2018-02-22 508 f266a683a4804d Arvid Brodin 2014-07-04 509 /* Forward the frame through all devices except: f266a683a4804d Arvid Brodin 2014-07-04 510 * - Back through the receiving device f266a683a4804d Arvid Brodin 2014-07-04 511 * - If it's a HSR frame: through a device where it has passed before cec32b3c120970 Murali Karicheri 2020-06-02 512 * - if it's a PRP frame: through another PRP slave device (no bridge) f266a683a4804d Arvid Brodin 2014-07-04 513 * - To the local HSR master only if the frame is directly addressed to it, or f266a683a4804d Arvid Brodin 2014-07-04 514 * a non-supervision multicast or broadcast frame. f266a683a4804d Arvid Brodin 2014-07-04 515 * f266a683a4804d Arvid Brodin 2014-07-04 516 * HSR slave devices should insert a HSR tag into the frame, or forward the f266a683a4804d Arvid Brodin 2014-07-04 517 * frame unchanged if it's already tagged. Interlink devices should strip HSR f266a683a4804d Arvid Brodin 2014-07-04 518 * tags if they're of the non-HSR type (but only after duplicate discard). The f266a683a4804d Arvid Brodin 2014-07-04 519 * master device always strips HSR tags. f266a683a4804d Arvid Brodin 2014-07-04 520 */ f266a683a4804d Arvid Brodin 2014-07-04 @521 static void hsr_forward_do(struct hsr_frame_info *frame) f266a683a4804d Arvid Brodin 2014-07-04 522 { f266a683a4804d Arvid Brodin 2014-07-04 523 struct hsr_port *port; cec32b3c120970 Murali Karicheri 2020-06-02 524 struct sk_buff *skb = NULL; 514cdd7471ff78 WingMan Kwok 2018-02-22 525 unsigned int dir_ports = 0; f266a683a4804d Arvid Brodin 2014-07-04 526 f266a683a4804d Arvid Brodin 2014-07-04 527 hsr_for_each_port(frame->port_rcv->hsr, port) { f266a683a4804d Arvid Brodin 2014-07-04 528 /* Don't send frame back the way it came */ f266a683a4804d Arvid Brodin 2014-07-04 529 if (port == frame->port_rcv) f266a683a4804d Arvid Brodin 2014-07-04 530 continue; f266a683a4804d Arvid Brodin 2014-07-04 531 f266a683a4804d Arvid Brodin 2014-07-04 532 /* Don't deliver locally unless we should */ 5670342ced28b8 Murali Karicheri 2019-04-05 533 if (port->type == HSR_PT_MASTER && !frame->is_local_dest) f266a683a4804d Arvid Brodin 2014-07-04 534 continue; f266a683a4804d Arvid Brodin 2014-07-04 535 f266a683a4804d Arvid Brodin 2014-07-04 536 /* Deliver frames directly addressed to us to master only */ 5670342ced28b8 Murali Karicheri 2019-04-05 537 if (port->type != HSR_PT_MASTER && frame->is_local_exclusive) f266a683a4804d Arvid Brodin 2014-07-04 538 continue; f266a683a4804d Arvid Brodin 2014-07-04 539 cec32b3c120970 Murali Karicheri 2020-06-02 540 /* Don't send frame over port where it has been sent before. dc8c14dea9d6ec Murali Karicheri 2020-06-18 541 * Also if rx LRE is offloaded, hardware does duplication dc8c14dea9d6ec Murali Karicheri 2020-06-18 542 * detection and discard and send only one copy to the upper dc8c14dea9d6ec Murali Karicheri 2020-06-18 543 * device and thus discard duplicate detection. For PRP, frame dc8c14dea9d6ec Murali Karicheri 2020-06-18 544 * could be from a SAN for which bypass duplicate discard here. cec32b3c120970 Murali Karicheri 2020-06-02 545 */ dc8c14dea9d6ec Murali Karicheri 2020-06-18 546 if (!port->hsr->rx_offloaded && !frame->is_from_san && cec32b3c120970 Murali Karicheri 2020-06-02 547 hsr_register_frame_out(port, frame->node_src, f266a683a4804d Arvid Brodin 2014-07-04 548 frame->sequence_nr)) f266a683a4804d Arvid Brodin 2014-07-04 549 continue; f266a683a4804d Arvid Brodin 2014-07-04 550 dc8c14dea9d6ec Murali Karicheri 2020-06-18 551 /* In LRE offloaded case, don't expect supervision frames from dc8c14dea9d6ec Murali Karicheri 2020-06-18 552 * slave ports for host as they get processed at the h/w or dc8c14dea9d6ec Murali Karicheri 2020-06-18 553 * firmware. dc8c14dea9d6ec Murali Karicheri 2020-06-18 554 */ dc8c14dea9d6ec Murali Karicheri 2020-06-18 555 if (frame->is_supervision && dc8c14dea9d6ec Murali Karicheri 2020-06-18 556 port->type == HSR_PT_MASTER && !port->hsr->rx_offloaded) { cec32b3c120970 Murali Karicheri 2020-06-02 557 if (frame->skb_hsr) cec32b3c120970 Murali Karicheri 2020-06-02 558 skb = frame->skb_hsr; cec32b3c120970 Murali Karicheri 2020-06-02 559 else if (frame->skb_prp) cec32b3c120970 Murali Karicheri 2020-06-02 560 skb = frame->skb_prp; cec32b3c120970 Murali Karicheri 2020-06-02 561 if (skb) cec32b3c120970 Murali Karicheri 2020-06-02 562 hsr_handle_sup_frame(skb, frame->node_src, f266a683a4804d Arvid Brodin 2014-07-04 563 frame->port_rcv); f266a683a4804d Arvid Brodin 2014-07-04 564 continue; f266a683a4804d Arvid Brodin 2014-07-04 565 } f266a683a4804d Arvid Brodin 2014-07-04 566 dc8c14dea9d6ec Murali Karicheri 2020-06-18 567 /* if L2 forward is offloaded, or protocol is PRP, dc8c14dea9d6ec Murali Karicheri 2020-06-18 568 * don't forward frame across slaves. dc8c14dea9d6ec Murali Karicheri 2020-06-18 569 */ dc8c14dea9d6ec Murali Karicheri 2020-06-18 570 if ((port->hsr->l2_fwd_offloaded || dc8c14dea9d6ec Murali Karicheri 2020-06-18 571 port->hsr->prot_version == PRP_V1) && cec32b3c120970 Murali Karicheri 2020-06-02 572 ((frame->port_rcv->type == HSR_PT_SLAVE_A && cec32b3c120970 Murali Karicheri 2020-06-02 573 port->type == HSR_PT_SLAVE_B) || cec32b3c120970 Murali Karicheri 2020-06-02 574 (frame->port_rcv->type == HSR_PT_SLAVE_B && cec32b3c120970 Murali Karicheri 2020-06-02 575 port->type == HSR_PT_SLAVE_A))) cec32b3c120970 Murali Karicheri 2020-06-02 576 continue; cec32b3c120970 Murali Karicheri 2020-06-02 577 514cdd7471ff78 WingMan Kwok 2018-02-22 578 dir_ports = hsr_directed_tx_ports(frame); 514cdd7471ff78 WingMan Kwok 2018-02-22 579 if (dir_ports && !(dir_ports & BIT(port->type - 1))) 514cdd7471ff78 WingMan Kwok 2018-02-22 580 continue; 514cdd7471ff78 WingMan Kwok 2018-02-22 581 be083ff10713c5 WingMan Kwok 2018-02-16 582 if (port->type != HSR_PT_MASTER) { f266a683a4804d Arvid Brodin 2014-07-04 583 skb = frame_get_tagged_skb(frame, port); be083ff10713c5 WingMan Kwok 2018-02-16 584 } else { f266a683a4804d Arvid Brodin 2014-07-04 585 skb = frame_get_stripped_skb(frame, port); cec32b3c120970 Murali Karicheri 2020-06-02 586 be083ff10713c5 WingMan Kwok 2018-02-16 587 stripped_skb_get_shared_info(skb, frame); be083ff10713c5 WingMan Kwok 2018-02-16 588 } be083ff10713c5 WingMan Kwok 2018-02-16 589 05ca6e644dc9b7 Murali Karicheri 2019-04-05 590 if (!skb) { cec32b3c120970 Murali Karicheri 2020-06-02 591 frame->port_rcv->dev->stats.rx_dropped++; b76331be31438e Murali Karicheri 2020-06-18 592 if (frame->port_rcv->type == HSR_PT_SLAVE_A || b76331be31438e Murali Karicheri 2020-06-18 593 frame->port_rcv->type == HSR_PT_SLAVE_B) dc8c14dea9d6ec Murali Karicheri 2020-06-18 594 INC_CNT_RX_ERROR_AB(frame->port_rcv->type, b76331be31438e Murali Karicheri 2020-06-18 595 port->hsr); f266a683a4804d Arvid Brodin 2014-07-04 596 continue; f266a683a4804d Arvid Brodin 2014-07-04 597 } f266a683a4804d Arvid Brodin 2014-07-04 598 f266a683a4804d Arvid Brodin 2014-07-04 599 skb->dev = port->dev; f266a683a4804d Arvid Brodin 2014-07-04 600 if (port->type == HSR_PT_MASTER) dc8c14dea9d6ec Murali Karicheri 2020-06-18 601 hsr_deliver_master(skb, frame->node_src, port); f266a683a4804d Arvid Brodin 2014-07-04 602 else f266a683a4804d Arvid Brodin 2014-07-04 603 hsr_xmit(skb, port, frame); f266a683a4804d Arvid Brodin 2014-07-04 604 } f266a683a4804d Arvid Brodin 2014-07-04 605 } f266a683a4804d Arvid Brodin 2014-07-04 606 :::::: The code at line 521 was first introduced by commit :::::: f266a683a4804dc499efc6c2206ef68efed029d0 net/hsr: Better frame dispatch :::::: TO: Arvid Brodin <arvid.brodin(a)alten.se&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org