tree: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git irq/domain_cleanup head: 15ae82a261d8c7675a17bf904a86210f95382cab commit: 71069bb8e7be1c9c49daf89a6bccb7878d55a3dd [22/40] irqdomain: Introduce irq_resolve_mapping() config: x86_64-randconfig-a005-20210519 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8e93d10633d751a3e9169bf9fa68326925ffa097) 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/maz/arm-platforms.git/com... git remote add arm-platforms https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git git fetch --no-tags arm-platforms irq/domain_cleanup git checkout 71069bb8e7be1c9c49daf89a6bccb7878d55a3dd # 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/entry/vdso/vdso32/vclock_gettime.c:29: In file included from arch/x86/entry/vdso/vdso32/../vclock_gettime.c:15: In file included from arch/x86/entry/vdso/../../../../lib/vdso/gettimeofday.c:5: In file included from include/vdso/datapage.h:137: In file included from arch/x86/include/asm/vdso/gettimeofday.h:21: In file included from include/clocksource/hyperv_timer.h:18: In file included from arch/x86/include/asm/mshyperv.h:7: In file included from include/linux/msi.h:7: In file included from arch/x86/include/asm/msi.h:5: In file included from arch/x86/include/asm/irqdomain.h:5: In file included from include/linux/irqdomain.h:34: In file included from include/linux/irq.h:21: In file included from include/linux/slab.h:136: In file included from include/linux/kasan.h:28: #error Missing MAX_POSSIBLE_PHYSMEM_BITS definition ^ In file included from arch/x86/entry/vdso/vdso32/vclock_gettime.c:29: arch/x86/entry/vdso/vdso32/../vclock_gettime.c:70:5: warning: no previous prototype for function '__vdso_clock_gettime64' [-Wmissing-prototypes] int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts) ^ arch/x86/entry/vdso/vdso32/../vclock_gettime.c:70:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts) ^ static 1 warning and 1 error generated. vim +1511 include/linux/pgtable.h ^1da177e4c3f415 include/asm-generic/pgtable.h Linus Torvalds 2005-04-16 1503 cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1504 #if !defined(MAX_POSSIBLE_PHYSMEM_BITS) && !defined(CONFIG_64BIT) cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1505 #ifdef CONFIG_PHYS_ADDR_T_64BIT cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1506 /* cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1507 * ZSMALLOC needs to know the highest PFN on 32-bit architectures cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1508 * with physical address space extension, but falls back to cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1509 * BITS_PER_LONG otherwise. cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1510 */ cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 @1511 #error Missing MAX_POSSIBLE_PHYSMEM_BITS definition cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1512 #else cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1513 #define MAX_POSSIBLE_PHYSMEM_BITS 32 cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1514 #endif cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1515 #endif cef397038167ac1 include/linux/pgtable.h Arnd Bergmann 2020-11-11 1516 :::::: The code at line 1511 was first introduced by commit :::::: cef397038167ac15d085914493d6c86385773709 arch: pgtable: define MAX_POSSIBLE_PHYSMEM_BITS where needed :::::: TO: Arnd Bergmann <arnd(a)arndb.de&gt; :::::: CC: Arnd Bergmann <arnd(a)arndb.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org