tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: b791d1bdf9212d944d749a5c7ff6febdba241771 commit: f37f05503575c59020dacd36e999f4e8b3dbc115 mt76: mt76x2e: disable pcie_aspm by default date: 8 months ago config: microblaze-randconfig-r023-20200612 (attached as .config) compiler: microblaze-linux-gcc (GCC) 9.3.0 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 git checkout f37f05503575c59020dacd36e999f4e8b3dbc115 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze 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 >>, old ones prefixed by <<): >> drivers/net/wireless/mediatek/mt76/pci.c:8:6: warning: no previous prototype for 'mt76_pci_disable_aspm' [-Wmissing-prototypes] 8 | void mt76_pci_disable_aspm(struct pci_dev *pdev) | ^~~~~~~~~~~~~~~~~~~~~ vim +/mt76_pci_disable_aspm +8 drivers/net/wireless/mediatek/mt76/pci.c 7 > 8 void mt76_pci_disable_aspm(struct pci_dev *pdev)