tree: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git memblock/iterators-cleanup/v3 head: f0d593460d044672ca2ea065efc283e30dd23ef1 commit: 01b2e0673f21479222dd0f387b5b73ec037d8096 [12/17] arch, drivers: replace for_each_membock() with for_each_mem_range() config: powerpc64-randconfig-r026-20200810 (attached as .config) compiler: powerpc-linux-gcc (GCC) 9.3.0 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 git checkout 01b2e0673f21479222dd0f387b5b73ec037d8096 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc64 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 >>): arch/powerpc/mm/kasan/kasan_init_32.c: In function 'kasan_init': 150 | ret = kasan_init_region(__va(base), top - base); | ^~~ | net arch/powerpc/mm/kasan/kasan_init_32.c:150:3: note: each undeclared identifier is reported only once for each function it appears in vim +150 arch/powerpc/mm/kasan/kasan_init_32.c 41ea93cf7ba4e0 Christophe Leroy 2020-07-02 138 41ea93cf7ba4e0 Christophe Leroy 2020-07-02 139 void __init kasan_init(void) 41ea93cf7ba4e0 Christophe Leroy 2020-07-02 140 { 01b2e0673f2147 Mike Rapoport 2020-07-26 141 phys_addr_t base, end; 01b2e0673f2147 Mike Rapoport 2020-07-26 142 u64 i; 2edb16efc899f9 Christophe Leroy 2019-04-26 143 01b2e0673f2147 Mike Rapoport 2020-07-26 144 for_each_mem_range(i, &base, &end) { 01b2e0673f2147 Mike Rapoport 2020-07-26 145 phys_addr_t top = min(end, total_lowmem); 2edb16efc899f9 Christophe Leroy 2019-04-26 146 2edb16efc899f9 Christophe Leroy 2019-04-26 147 if (base >= top) 2edb16efc899f9 Christophe Leroy 2019-04-26 148 continue; 2edb16efc899f9 Christophe Leroy 2019-04-26 149 2edb16efc899f9 Christophe Leroy 2019-04-26 @150 ret = kasan_init_region(__va(base), top - base); 2edb16efc899f9 Christophe Leroy 2019-04-26 151 if (ret) 2edb16efc899f9 Christophe Leroy 2019-04-26 152 panic("kasan: kasan_init_region() failed"); 2edb16efc899f9 Christophe Leroy 2019-04-26 153 } ec97d022f621c6 Christophe Leroy 2020-05-19 154 2edb16efc899f9 Christophe Leroy 2019-04-26 155 kasan_remap_early_shadow_ro(); 2edb16efc899f9 Christophe Leroy 2019-04-26 156 2edb16efc899f9 Christophe Leroy 2019-04-26 157 clear_page(kasan_early_shadow_page); 2edb16efc899f9 Christophe Leroy 2019-04-26 158 2edb16efc899f9 Christophe Leroy 2019-04-26 159 /* At this point kasan is fully initialized. Enable error messages */ 2edb16efc899f9 Christophe Leroy 2019-04-26 160 init_task.kasan_depth = 0; 2edb16efc899f9 Christophe Leroy 2019-04-26 161 pr_info("KASAN init done\n"); 2edb16efc899f9 Christophe Leroy 2019-04-26 162 } 2edb16efc899f9 Christophe Leroy 2019-04-26 163 :::::: The code at line 150 was first introduced by commit :::::: 2edb16efc899f9c232e2d880930b855e4cf55df4 powerpc/32: Add KASAN support :::::: TO: Christophe Leroy <christophe.leroy(a)c-s.fr&gt; :::::: CC: Michael Ellerman <mpe(a)ellerman.id.au&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org