tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 7fef2edf7cc753b51f7ccc74993971b0a9c81eca commit: dc4875f0e791de554bdc45aa1dbd6e45e107e50f mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t * date: 5 days ago config: arm-buildonly-randconfig-r002-20210713 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout dc4875f0e791de554bdc45aa1dbd6e45e107e50f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): pgd_page_vaddr(*pgd_offset_k(KASAN_SHADOW_START)), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/asm-generic/pgtable-nop4d.h:44:31: note: expanded from macro 'pgd_page_vaddr' #define pgd_page_vaddr(pgd) ((unsigned long)(p4d_pgtable((p4d_t){ pgd }))) ^ arch/arm/include/asm/string.h:58:45: note: expanded from macro 'memcpy' #define memcpy(dst, src, len) __memcpy(dst, src, len) ^~~ arch/arm/include/asm/string.h:21:47: note: passing argument to parameter 'src' here extern void *__memcpy(void *dest, const void *src, __kernel_size_t n); ^ 1 warning generated. vim +229 arch/arm/mm/kasan_init.c 5615f69bc20974 Linus Walleij 2020-10-25 204 5615f69bc20974 Linus Walleij 2020-10-25 205 void __init kasan_init(void) 5615f69bc20974 Linus Walleij 2020-10-25 206 { 5615f69bc20974 Linus Walleij 2020-10-25 207 phys_addr_t pa_start, pa_end; 5615f69bc20974 Linus Walleij 2020-10-25 208 u64 i; 5615f69bc20974 Linus Walleij 2020-10-25 209 5615f69bc20974 Linus Walleij 2020-10-25 210 /* 5615f69bc20974 Linus Walleij 2020-10-25 211 * We are going to perform proper setup of shadow memory. 5615f69bc20974 Linus Walleij 2020-10-25 212 * 5615f69bc20974 Linus Walleij 2020-10-25 213 * At first we should unmap early shadow (clear_pgds() call bellow). 5615f69bc20974 Linus Walleij 2020-10-25 214 * However, instrumented code can't execute without shadow memory. 5615f69bc20974 Linus Walleij 2020-10-25 215 * 5615f69bc20974 Linus Walleij 2020-10-25 216 * To keep the early shadow memory MMU tables around while setting up 5615f69bc20974 Linus Walleij 2020-10-25 217 * the proper shadow memory, we copy swapper_pg_dir (the initial page 5615f69bc20974 Linus Walleij 2020-10-25 218 * table) to tmp_pgd_table and use that to keep the early shadow memory 5615f69bc20974 Linus Walleij 2020-10-25 219 * mapped until the full shadow setup is finished. Then we swap back 5615f69bc20974 Linus Walleij 2020-10-25 220 * to the proper swapper_pg_dir. 5615f69bc20974 Linus Walleij 2020-10-25 221 */ 5615f69bc20974 Linus Walleij 2020-10-25 222 5615f69bc20974 Linus Walleij 2020-10-25 223 memcpy(tmp_pgd_table, swapper_pg_dir, sizeof(tmp_pgd_table)); 5615f69bc20974 Linus Walleij 2020-10-25 224 #ifdef CONFIG_ARM_LPAE 5615f69bc20974 Linus Walleij 2020-10-25 225 /* We need to be in the same PGD or this won't work */ 5615f69bc20974 Linus Walleij 2020-10-25 226 BUILD_BUG_ON(pgd_index(KASAN_SHADOW_START) != 5615f69bc20974 Linus Walleij 2020-10-25 227 pgd_index(KASAN_SHADOW_END)); 5615f69bc20974 Linus Walleij 2020-10-25 228 memcpy(tmp_pmd_table, 5615f69bc20974 Linus Walleij 2020-10-25 @229 pgd_page_vaddr(*pgd_offset_k(KASAN_SHADOW_START)), :::::: The code at line 229 was first introduced by commit :::::: 5615f69bc2097452ecc954f5264d784e158d6801 ARM: 9016/2: Initialize the mapping of KASan shadow memory :::::: TO: Linus Walleij <linus.walleij(a)linaro.org&gt; :::::: CC: Russell King <rmk+kernel(a)armlinux.org.uk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org