tree: git://git.infradead.org/users/hch/misc.git vfio-remove-nvlink head: 8a8ecbd5d30cdb27c47ea06feb682d07b123af5f commit: 8a8ecbd5d30cdb27c47ea06feb682d07b123af5f [4/4] powerpc/powernv: remove the nvlink support config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-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 remote add hch-misc git://git.infradead.org/users/hch/misc.git git fetch --no-tags hch-misc vfio-remove-nvlink git checkout 8a8ecbd5d30cdb27c47ea06feb682d07b123af5f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 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 >>): 1439 | void pnv_pci_ioda2_tce_invalidate_entire(struct pnv_phb *phb, bool rm) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/platforms/powernv/pci-ioda.c: In function 'pnv_pci_ioda2_set_window': arch/powerpc/platforms/powernv/pci-ioda.c:1685:2: error: implicit declaration of function 'pnv_pci_ioda2_tce_invalidate_pe'; did you mean 'pnv_pci_ioda2_tce_invalidate'? [-Werror=implicit-function-declaration] 1685 | pnv_pci_ioda2_tce_invalidate_pe(pe); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | pnv_pci_ioda2_tce_invalidate cc1: some warnings being treated as errors vim +/pnv_pci_ioda2_tce_invalidate_entire +1439 arch/powerpc/platforms/powernv/pci-ioda.c e57080f17da5d5 Alexey Kardashevskiy 2015-06-05 1438 6b3d12a948d279 Alistair Popple 2017-05-03 @1439 void pnv_pci_ioda2_tce_invalidate_entire(struct pnv_phb *phb, bool rm) 6b3d12a948d279 Alistair Popple 2017-05-03 1440 { 6b3d12a948d279 Alistair Popple 2017-05-03 1441 if (phb->model == PNV_PHB_MODEL_NPU || phb->model == PNV_PHB_MODEL_PHB3) 6b3d12a948d279 Alistair Popple 2017-05-03 1442 pnv_pci_phb3_tce_invalidate_entire(phb, rm); 6b3d12a948d279 Alistair Popple 2017-05-03 1443 else 6b3d12a948d279 Alistair Popple 2017-05-03 1444 opal_pci_tce_kill(phb->opal_id, OPAL_PCI_TCE_KILL, 0, 0, 0, 0); 6b3d12a948d279 Alistair Popple 2017-05-03 1445 } 6b3d12a948d279 Alistair Popple 2017-05-03 1446 :::::: The code at line 1439 was first introduced by commit :::::: 6b3d12a948d27977816a15eb48409a298902a548 powerpc/powernv: Fix TCE kill on NVLink2 :::::: TO: Alistair Popple <alistair(a)popple.id.au&gt; :::::: CC: Michael Ellerman <mpe(a)ellerman.id.au&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org