Hi Niklas, I love your patch! Yet something to improve: [auto build test ERROR on pci/next] [also build test ERROR on powerpc/next s390/features pm/linux-next v5.14-rc2 next-20210720] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Niklas-Schnelle/PCI-Move-pci_dev... base: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next config: arm-buildonly-randconfig-r002-20210720 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 10.3.0 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/52e04c39213cf20b8c6bc717cfda56103... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Niklas-Schnelle/PCI-Move-pci_dev_is-assign_added-to-pci-h/20210720-180050 git checkout 52e04c39213cf20b8c6bc717cfda56103b871cd1 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash drivers/pci/pcie/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/pci/pcie/dpc.c: In function 'dpc_completed': 85 | if (test_bit(PCI_DPC_RECOVERING, &pdev->priv_flags)) | ^~~~~~~~~~~~~~~~~~ drivers/pci/pcie/dpc.c:85:15: note: each undeclared identifier is reported only once for each function it appears in In file included from include/linux/bitops.h:32, from include/linux/kernel.h:12, from include/linux/delay.h:22, from drivers/pci/pcie/dpc.c:12: drivers/pci/pcie/dpc.c: In function 'pci_dpc_recovered': 122 | return test_and_clear_bit(PCI_DPC_RECOVERED, &pdev->priv_flags); | ^~~~~~~~~~~~~~~~~ arch/arm/include/asm/bitops.h:181:24: note: in definition of macro 'ATOMIC_BITOP' 181 | (__builtin_constant_p(nr) ? ____atomic_##name(nr, p) : _##name(nr,p)) | ^~ drivers/pci/pcie/dpc.c:122:9: note: in expansion of macro 'test_and_clear_bit' 122 | return test_and_clear_bit(PCI_DPC_RECOVERED, &pdev->priv_flags); | ^~~~~~~~~~~~~~~~~~ drivers/pci/pcie/dpc.c: In function 'dpc_reset_link': drivers/pci/pcie/dpc.c:149:10: error: 'PCI_DPC_RECOVERING' undeclared (first use in this function) 149 | set_bit(PCI_DPC_RECOVERING, &pdev->priv_flags); | ^~~~~~~~~~~~~~~~~~ arch/arm/include/asm/bitops.h:181:24: note: in definition of macro 'ATOMIC_BITOP' 181 | (__builtin_constant_p(nr) ? ____atomic_##name(nr, p) : _##name(nr,p)) | ^~ drivers/pci/pcie/dpc.c:149:2: note: in expansion of macro 'set_bit' 149 | set_bit(PCI_DPC_RECOVERING, &pdev->priv_flags); | ^~~~~~~ drivers/pci/pcie/dpc.c:165:13: error: 'PCI_DPC_RECOVERED' undeclared (first use in this function) 165 | clear_bit(PCI_DPC_RECOVERED, &pdev->priv_flags); | ^~~~~~~~~~~~~~~~~ arch/arm/include/asm/bitops.h:181:24: note: in definition of macro 'ATOMIC_BITOP' 181 | (__builtin_constant_p(nr) ? ____atomic_##name(nr, p) : _##name(nr,p)) | ^~ drivers/pci/pcie/dpc.c:165:3: note: in expansion of macro 'clear_bit' 165 | clear_bit(PCI_DPC_RECOVERED, &pdev->priv_flags); | ^~~~~~~~~ drivers/pci/pcie/dpc.c: In function 'pci_dpc_recovered': drivers/pci/pcie/dpc.c:123:1: error: control reaches end of non-void function [-Werror=return-type] 123 | } | ^ cc1: some warnings being treated as errors vim +/PCI_DPC_RECOVERING +85 drivers/pci/pcie/dpc.c a97396c6eb13f65b Lukas Wunner 2021-05-01 75 a97396c6eb13f65b Lukas Wunner 2021-05-01 76 #ifdef CONFIG_HOTPLUG_PCI_PCIE a97396c6eb13f65b Lukas Wunner 2021-05-01 77 static bool dpc_completed(struct pci_dev *pdev) a97396c6eb13f65b Lukas Wunner 2021-05-01 78 { a97396c6eb13f65b Lukas Wunner 2021-05-01 79 u16 status; a97396c6eb13f65b Lukas Wunner 2021-05-01 80 a97396c6eb13f65b Lukas Wunner 2021-05-01 81 pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_STATUS, &status); a97396c6eb13f65b Lukas Wunner 2021-05-01 82 if ((status != 0xffff) && (status & PCI_EXP_DPC_STATUS_TRIGGER)) a97396c6eb13f65b Lukas Wunner 2021-05-01 83 return false; a97396c6eb13f65b Lukas Wunner 2021-05-01 84 a97396c6eb13f65b Lukas Wunner 2021-05-01 @85 if (test_bit(PCI_DPC_RECOVERING, &pdev->priv_flags)) a97396c6eb13f65b Lukas Wunner 2021-05-01 86 return false; a97396c6eb13f65b Lukas Wunner 2021-05-01 87 a97396c6eb13f65b Lukas Wunner 2021-05-01 88 return true; a97396c6eb13f65b Lukas Wunner 2021-05-01 89 } a97396c6eb13f65b Lukas Wunner 2021-05-01 90 a97396c6eb13f65b Lukas Wunner 2021-05-01 91 /** a97396c6eb13f65b Lukas Wunner 2021-05-01 92 * pci_dpc_recovered - whether DPC triggered and has recovered successfully a97396c6eb13f65b Lukas Wunner 2021-05-01 93 * @pdev: PCI device a97396c6eb13f65b Lukas Wunner 2021-05-01 94 * a97396c6eb13f65b Lukas Wunner 2021-05-01 95 * Return true if DPC was triggered for @pdev and has recovered successfully. a97396c6eb13f65b Lukas Wunner 2021-05-01 96 * Wait for recovery if it hasn't completed yet. Called from the PCIe hotplug a97396c6eb13f65b Lukas Wunner 2021-05-01 97 * driver to recognize and ignore Link Down/Up events caused by DPC. a97396c6eb13f65b Lukas Wunner 2021-05-01 98 */ a97396c6eb13f65b Lukas Wunner 2021-05-01 99 bool pci_dpc_recovered(struct pci_dev *pdev) a97396c6eb13f65b Lukas Wunner 2021-05-01 100 { a97396c6eb13f65b Lukas Wunner 2021-05-01 101 struct pci_host_bridge *host; a97396c6eb13f65b Lukas Wunner 2021-05-01 102 a97396c6eb13f65b Lukas Wunner 2021-05-01 103 if (!pdev->dpc_cap) a97396c6eb13f65b Lukas Wunner 2021-05-01 104 return false; a97396c6eb13f65b Lukas Wunner 2021-05-01 105 a97396c6eb13f65b Lukas Wunner 2021-05-01 106 /* a97396c6eb13f65b Lukas Wunner 2021-05-01 107 * Synchronization between hotplug and DPC is not supported a97396c6eb13f65b Lukas Wunner 2021-05-01 108 * if DPC is owned by firmware and EDR is not enabled. a97396c6eb13f65b Lukas Wunner 2021-05-01 109 */ a97396c6eb13f65b Lukas Wunner 2021-05-01 110 host = pci_find_host_bridge(pdev->bus); a97396c6eb13f65b Lukas Wunner 2021-05-01 111 if (!host->native_dpc && !IS_ENABLED(CONFIG_PCIE_EDR)) a97396c6eb13f65b Lukas Wunner 2021-05-01 112 return false; a97396c6eb13f65b Lukas Wunner 2021-05-01 113 a97396c6eb13f65b Lukas Wunner 2021-05-01 114 /* a97396c6eb13f65b Lukas Wunner 2021-05-01 115 * Need a timeout in case DPC never completes due to failure of a97396c6eb13f65b Lukas Wunner 2021-05-01 116 * dpc_wait_rp_inactive(). The spec doesn't mandate a time limit, a97396c6eb13f65b Lukas Wunner 2021-05-01 117 * but reports indicate that DPC completes within 4 seconds. a97396c6eb13f65b Lukas Wunner 2021-05-01 118 */ a97396c6eb13f65b Lukas Wunner 2021-05-01 119 wait_event_timeout(dpc_completed_waitqueue, dpc_completed(pdev), a97396c6eb13f65b Lukas Wunner 2021-05-01 120 msecs_to_jiffies(4000)); a97396c6eb13f65b Lukas Wunner 2021-05-01 121 a97396c6eb13f65b Lukas Wunner 2021-05-01 @122 return test_and_clear_bit(PCI_DPC_RECOVERED, &pdev->priv_flags); a97396c6eb13f65b Lukas Wunner 2021-05-01 123 } a97396c6eb13f65b Lukas Wunner 2021-05-01 124 #endif /* CONFIG_HOTPLUG_PCI_PCIE */ a97396c6eb13f65b Lukas Wunner 2021-05-01 125 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org