tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git highmem head: 4025d33ae44c6f748765f64dcb1c97ed4b55e756 commit: eb739dc8f2b6808531c2f47bad9cb3f29c040ae2 [17/18] mm/highmem: Provide kmap_local* config: x86_64-randconfig-a013-20201030 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project fa5a13276764a2657b3571fa3c57b07ee5d2d661) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?id... git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git git fetch --no-tags tglx-devel highmem git checkout eb739dc8f2b6808531c2f47bad9cb3f29c040ae2 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from arch/x86/kernel/asm-offsets.c:13: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:14: In file included from include/linux/pagemap.h:11: __kunmap_local(addr); ^ static inline void __kunmap_local(void *addr) ^ include/linux/highmem.h:265:2: note: previous implicit declaration is here __kunmap_local(addr); ^ 2 errors generated. make[2]: *** [scripts/Makefile.build:117: arch/x86/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1200: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:185: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +/__kunmap_local +265 include/linux/highmem.h 262 263 static inline void __kunmap_atomic(void *addr) 264 { 266 } 267 268 static inline void *kmap_local_page(struct page *page) 269 { 270 migrate_disable(); 271 return page_address(page); 272 } 273 274 static inline void *kmap_local_page_prot(struct page *page, pgprot_t prot) 275 { 276 return kmap_local_page(page); 277 } 278 279 static inline void *kmap_local_pfn(unsigned long pfn) 280 { 281 return kmap_local_page(pfn_to_page(pfn)); 282 } 283 285 { 286 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP 287 kunmap_flush_on_unmap(addr); 288 #endif 289 } 290 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org