tree: https://github.com/Villemoes/linux ppc-inline head: c5c9f702825a88a83d986fa6f21f3eef911bc094 commit: 63f750d2dad4f52b1999c92e2df28b3fee25a3ed [1/5] asm-generic: move pcu_iounmap from iomap.h to pci_iomap.h config: riscv-defconfig (attached as .config) compiler: riscv64-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 63f750d2dad4f52b1999c92e2df28b3fee25a3ed # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=riscv If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): In file included from arch/riscv/include/asm/io.h:280:0, from include/linux/scatterlist.h:9, from include/linux/dma-mapping.h:11, from include/linux/skbuff.h:31, from include/linux/icmpv6.h:5, from include/linux/ipv6.h:86, from include/net/ipv6.h:12, from include/linux/sunrpc/addr.h:14, from fs/nfs/client.c:19: #define pci_iounmap pci_iounmap ^ static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p) ^~~~~~~~~~~ In file included from include/asm-generic/io.h:19:0, from arch/riscv/include/asm/io.h:280, from include/linux/scatterlist.h:9, from include/linux/dma-mapping.h:11, from include/linux/skbuff.h:31, from include/linux/icmpv6.h:5, from include/linux/ipv6.h:86, from include/net/ipv6.h:12, from include/linux/sunrpc/addr.h:14, from fs/nfs/client.c:19: include/asm-generic/pci_iomap.h:22:13: note: previous declaration of 'pci_iounmap' was here extern void pci_iounmap(struct pci_dev *dev, void __iomem *); ^~~~~~~~~~~ vim +/pci_iounmap +895 include/asm-generic/io.h cd24834130ac65 Jan Glauber 2012-11-29 893 cd24834130ac65 Jan Glauber 2012-11-29 894 #ifndef pci_iounmap 9216efafc52ff9 Thierry Reding 2014-10-01 @895 #define pci_iounmap pci_iounmap 3f7e212df82ca0 Arnd Bergmann 2009-05-13 @896 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p) 3f7e212df82ca0 Arnd Bergmann 2009-05-13 897 { 3f7e212df82ca0 Arnd Bergmann 2009-05-13 898 } cd24834130ac65 Jan Glauber 2012-11-29 899 #endif 3f7e212df82ca0 Arnd Bergmann 2009-05-13 900 #endif /* CONFIG_GENERIC_IOMAP */ 3f7e212df82ca0 Arnd Bergmann 2009-05-13 901 :::::: The code at line 895 was first introduced by commit :::::: 9216efafc52ff99e9351ef60de5fcafc2bc8adb6 asm-generic/io.h: Reconcile I/O accessor overrides :::::: TO: Thierry Reding <treding(a)nvidia.com&gt; :::::: CC: Thierry Reding <treding(a)nvidia.com&gt; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation