tree: https://github.com/weiny2/linux-kernel.git lm-misc5 head: f505c1218258e2384473cd29cc8a5f0623a1a4b2 commit: 8de59f69a0734d4181afd04f3d2ef17d31ecd191 [6/9] arch/kmap: Remove redundant arch specific kmaps config: csky-alldefconfig (attached as .config) compiler: csky-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 8de59f69a0734d4181afd04f3d2ef17d31ecd191 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=csky 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 include/linux/pagemap.h:11, from include/linux/blkdev.h:16, from kernel//sched/sched.h:39, from kernel//sched/core.c:9: 40 | static inline void *kmap(struct page *page) | ^~~~ In file included from include/linux/highmem.h:37, from include/linux/pagemap.h:11, from include/linux/blkdev.h:16, from kernel//sched/sched.h:39, from kernel//sched/core.c:9: arch/csky/include/asm/highmem.h:37:14: note: previous declaration of 'kmap' was here 37 | extern void *kmap(struct page *page); | ^~~~ vim +/kmap +40 include/linux/highmem.h 38 39 #ifndef ARCH_HAS_KMAP 41 { 42 return __kmap(page); 43 } 44 #endif 45 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org