tree: https://github.com/intel/linux-intel-lts.git 4.19/android_r head: 8367d521b6ca9b77d18fbb56f936df6824f0843c commit: 8367d521b6ca9b77d18fbb56f936df6824f0843c [2/2] Merge remote-tracking branch 'google-repo/android-4.19-stable' into 4.19/android_r config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/intel/linux-intel-lts/commit/8367d521b6ca9b77d18fbb56f... git remote add intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-lts 4.19/android_r git checkout 8367d521b6ca9b77d18fbb56f936df6824f0843c # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 prepare 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/include/asm/pgtable.h:1445, from include/linux/memremap.h:7, from include/linux/mm.h:27, from include/linux/memcontrol.h:29, from include/linux/swap.h:9, from include/linux/suspend.h:5, from arch/x86/kernel/asm-offsets.c:13: 1125 | #error Missing MAX_POSSIBLE_PHYSMEM_BITS definition | ^~~~~ arch/x86/kernel/asm-offsets.c:32:6: warning: no previous prototype for 'common' [-Wmissing-prototypes] 32 | void common(void) { | ^~~~~~ make[2]: *** [./Kbuild:56: arch/x86/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1220: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:146: sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +1125 include/asm-generic/pgtable.h ^1da177e4c3f41 Linus Torvalds 2005-04-16 1117 d4fe42d646f277 Arnd Bergmann 2020-11-11 1118 #if !defined(MAX_POSSIBLE_PHYSMEM_BITS) && !defined(CONFIG_64BIT) d4fe42d646f277 Arnd Bergmann 2020-11-11 1119 #ifdef CONFIG_PHYS_ADDR_T_64BIT d4fe42d646f277 Arnd Bergmann 2020-11-11 1120 /* d4fe42d646f277 Arnd Bergmann 2020-11-11 1121 * ZSMALLOC needs to know the highest PFN on 32-bit architectures d4fe42d646f277 Arnd Bergmann 2020-11-11 1122 * with physical address space extension, but falls back to d4fe42d646f277 Arnd Bergmann 2020-11-11 1123 * BITS_PER_LONG otherwise. d4fe42d646f277 Arnd Bergmann 2020-11-11 1124 */ d4fe42d646f277 Arnd Bergmann 2020-11-11 @1125 #error Missing MAX_POSSIBLE_PHYSMEM_BITS definition d4fe42d646f277 Arnd Bergmann 2020-11-11 1126 #else d4fe42d646f277 Arnd Bergmann 2020-11-11 1127 #define MAX_POSSIBLE_PHYSMEM_BITS 32 d4fe42d646f277 Arnd Bergmann 2020-11-11 1128 #endif d4fe42d646f277 Arnd Bergmann 2020-11-11 1129 #endif d4fe42d646f277 Arnd Bergmann 2020-11-11 1130 :::::: The code at line 1125 was first introduced by commit :::::: d4fe42d646f277dfbc8a6cbc82bc4c8a12dd7798 arch: pgtable: define MAX_POSSIBLE_PHYSMEM_BITS where needed :::::: TO: Arnd Bergmann <arnd(a)arndb.de&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org