tree: https://github.com/weiny2/linux-kernel.git lm-misc3 head: 80c335a89ca34e82fad340c46ee8fdd6cc908f2e commit: 98755490c4ee337ec6b3d89ec434469b56c2cf99 [5/8] arch/kmap: Remove redundant arch specific kmaps config: mips-fuloong2e_defconfig (attached as .config) compiler: mips64el-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 98755490c4ee337ec6b3d89ec434469b56c2cf99 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from arch/mips/mm/cache.c:19: arch/mips/include/asm/highmem.h: In function 'kmap': 52 | void *addr = __kmap(page); | ^~~~~~ | kmap 54 | flush_tlb_one((unsigned long)addr); | ^~~~~~~~~~~~~ cc1: all warnings being treated as errors -- In file included from arch/mips/mm/fault.c:28: arch/mips/include/asm/highmem.h: In function 'kmap': 52 | void *addr = __kmap(page); | ^~~~~~ | kmap cc1: all warnings being treated as errors vim +52 arch/mips/include/asm/highmem.h 48 49 #define ARCH_HAS_KMAP 50 static inline void *kmap(struct page *page) 51 { 53 55 return addr; 56 } 57 extern void * kmap_high(struct page *page); 58 extern void kunmap_high(struct page *page); 59 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org