tree: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git pci/error head: 5692817fc88f347328e35cd7b19bd04f4400652e commit: 8fae7d8809b8151488969d6cfad2f6dd2c69d311 [2/8] PCI/ERR: Simplify pci_dev_set_io_state() config: arm64-randconfig-r025-20210209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?i... git remote add pci https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git git fetch --no-tags pci pci/error git checkout 8fae7d8809b8151488969d6cfad2f6dd2c69d311 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 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 >>): In file included from drivers/pci/controller/pci-ftpci100.c:31: dev->error_state == pci_channel_io_perm_failure; ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/pci/controller/../pci.h:348:20: note: use '=' to turn this equality comparison into an assignment dev->error_state == pci_channel_io_perm_failure; ^~ = 1 warning generated. -- In file included from drivers/pci/pcie/aspm.c:21: dev->error_state == pci_channel_io_perm_failure; ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/pci/pcie/../pci.h:348:20: note: use '=' to turn this equality comparison into an assignment dev->error_state == pci_channel_io_perm_failure; ^~ = 1 warning generated. -- In file included from drivers/pci/controller/dwc/pcie-designware.c:16: dev->error_state == pci_channel_io_perm_failure; ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/pci/controller/dwc/../../pci.h:348:20: note: use '=' to turn this equality comparison into an assignment dev->error_state == pci_channel_io_perm_failure; ^~ = 1 warning generated. vim +348 drivers/pci/controller/../pci.h 330 331 /** 332 * pci_dev_set_io_state - Set the new error state if possible. 333 * 334 * @dev - pci device to set new error_state 335 * @new - the state we want dev to be in 336 * 337 * Must be called with device_lock held. 338 * 339 * Returns true if state has been changed to the requested state. 340 */ 341 static inline bool pci_dev_set_io_state(struct pci_dev *dev, 342 pci_channel_state_t new) 343 { 344 device_lock_assert(&dev->dev); 345 346 /* Can always put a device in perm_failure state */ 347 if (new == pci_channel_io_perm_failure) { 349 return true; 350 } 351 352 /* If already in perm_failure, can't set to normal or frozen */ 353 if (dev->error_state == pci_channel_io_perm_failure) 354 return false; 355 356 /* Can always change normal to frozen or vice versa */ 357 dev->error_state = new; 358 return true; 359 } 360 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org