Hi Tiezhu, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on pci/next] [also build test WARNING on v5.9-rc5 next-20200911] [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/Tiezhu-Yang/PCI-portdrv-Only-dis... base: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next config: x86_64-randconfig-s021-20200913 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-191-g10164920-dirty # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/pci/pcie/portdrv_pci.c:167:57: sparse: sparse: restricted pci_power_t degrades to integer # https://github.com/0day-ci/linux/commit/554a10648754bd244b64a233c257821c4... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Tiezhu-Yang/PCI-portdrv-Only-disable-Bus-Master-on-kexec-reboot-and-connected-PCI-devices/20200914-043100 git checkout 554a10648754bd244b64a233c257821c4719be0e vim +167 drivers/pci/pcie/portdrv_pci.c 149 150 static void pcie_portdrv_shutdown(struct pci_dev *dev) 151 { 152 if (pci_bridge_d3_possible(dev)) { 153 pm_runtime_forbid(&dev->dev); 154 pm_runtime_get_noresume(&dev->dev); 155 pm_runtime_dont_use_autosuspend(&dev->dev); 156 } 157 158 pcie_port_device_remove(dev); 159 160 /* 161 * If this is a kexec reboot, turn off Bus Master bit on the 162 * device to tell it to not continue to do DMA. Don't touch 163 * devices in D3cold or unknown states. 164 * If it is not a kexec reboot, firmware will hit the PCI 165 * devices with big hammer and stop their DMA any way. 166 */ 168 pci_disable_device(dev); 169 } 170 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org