Hi "Björn, I love your patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] [also build test WARNING on jkirsher-next-queue/dev-queue next-20200518] [cannot apply to bpf/master linus/master v5.7-rc6] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Bj-rn-T-pel/Introduce-AF_XDP-buf... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 135b877874fae96b4372c8a3fbfaa8ff44ff86e3) reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): void i40e_fd_handle_status(struct i40e_ring *rx_ring, u64 qword0_raw, ^ drivers/net/ethernet/intel/i40e/i40e_txrx.c:531:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void i40e_fd_handle_status(struct i40e_ring *rx_ring, u64 qword0_raw, ^ static 1 warning generated. vim +/i40e_fd_handle_status +531 drivers/net/ethernet/intel/i40e/i40e_txrx.c 520 521 /** 522 * i40e_fd_handle_status - check the Programming Status for FD 523 * @rx_ring: the Rx ring for this descriptor 524 * @qword0_raw: qword0 525 * @qword1: qword1 after le_to_cpu 526 * @prog_id: the id originally used for programming 527 * 528 * This is used to verify if the FD programming or invalidation 529 * requested by SW to the HW is successful or not and take actions accordingly. 530 **/ 532 u64 qword1, u8 prog_id) 533 { 534 struct i40e_pf *pf = rx_ring->vsi->back; 535 struct pci_dev *pdev = pf->pdev; 536 struct i40e_32b_rx_wb_qw0 *qw0; 537 u32 fcnt_prog, fcnt_avail; 538 u32 error; 539 540 qw0 = (struct i40e_32b_rx_wb_qw0 *)&qword0_raw; 541 error = (qword1 & I40E_RX_PROG_STATUS_DESC_QW1_ERROR_MASK) >> 542 I40E_RX_PROG_STATUS_DESC_QW1_ERROR_SHIFT; 543 544 if (error == BIT(I40E_RX_PROG_STATUS_DESC_FD_TBL_FULL_SHIFT)) { 545 pf->fd_inv = le32_to_cpu(qw0->hi_dword.fd_id); 546 if (qw0->hi_dword.fd_id != 0 || 547 (I40E_DEBUG_FD & pf->hw.debug_mask)) 548 dev_warn(&pdev->dev, "ntuple filter loc = %d, could not be added\n", 549 pf->fd_inv); 550 551 /* Check if the programming error is for ATR. 552 * If so, auto disable ATR and set a state for 553 * flush in progress. Next time we come here if flush is in 554 * progress do nothing, once flush is complete the state will 555 * be cleared. 556 */ 557 if (test_bit(__I40E_FD_FLUSH_REQUESTED, pf->state)) 558 return; 559 560 pf->fd_add_err++; 561 /* store the current atr filter count */ 562 pf->fd_atr_cnt = i40e_get_current_atr_cnt(pf); 563 564 if (qw0->hi_dword.fd_id == 0 && 565 test_bit(__I40E_FD_SB_AUTO_DISABLED, pf->state)) { 566 /* These set_bit() calls aren't atomic with the 567 * test_bit() here, but worse case we potentially 568 * disable ATR and queue a flush right after SB 569 * support is re-enabled. That shouldn't cause an 570 * issue in practice 571 */ 572 set_bit(__I40E_FD_ATR_AUTO_DISABLED, pf->state); 573 set_bit(__I40E_FD_FLUSH_REQUESTED, pf->state); 574 } 575 576 /* filter programming failed most likely due to table full */ 577 fcnt_prog = i40e_get_global_fd_count(pf); 578 fcnt_avail = pf->fdir_pf_filter_count; 579 /* If ATR is running fcnt_prog can quickly change, 580 * if we are very close to full, it makes sense to disable 581 * FD ATR/SB and then re-enable it when there is room. 582 */ 583 if (fcnt_prog >= (fcnt_avail - I40E_FDIR_BUFFER_FULL_MARGIN)) { 584 if ((pf->flags & I40E_FLAG_FD_SB_ENABLED) && 585 !test_and_set_bit(__I40E_FD_SB_AUTO_DISABLED, 586 pf->state)) 587 if (I40E_DEBUG_FD & pf->hw.debug_mask) 588 dev_warn(&pdev->dev, "FD filter space full, new ntuple rules will not be added\n"); 589 } 590 } else if (error == BIT(I40E_RX_PROG_STATUS_DESC_NO_FD_ENTRY_SHIFT)) { 591 if (I40E_DEBUG_FD & pf->hw.debug_mask) 592 dev_info(&pdev->dev, "ntuple filter fd_id = %d, could not be removed\n", 593 qw0->hi_dword.fd_id); 594 } 595 } 596 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org