Hi Stephen, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: dbb5afad100a828c97e012c6106566d99f041db6 commit: 421015713b306e47af95d4d61cdfbd96d462e4cb ARM: 9017/2: Enable KASan for ARM date: 7 months ago config: arm-randconfig-s032-20210513 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # 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 421015713b306e47af95d4d61cdfbd96d462e4cb # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) -- drivers/mtd/nand/onenand/onenand_omap2.c:385:17: sparse: expected void const *src drivers/mtd/nand/onenand/onenand_omap2.c:385:17: sparse: got void [noderef] __iomem * drivers/mtd/nand/onenand/onenand_omap2.c:404:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const *src @@ got void [noderef] __iomem * @@ drivers/mtd/nand/onenand/onenand_omap2.c:404:9: sparse: expected void const *src drivers/mtd/nand/onenand/onenand_omap2.c:404:9: sparse: got void [noderef] __iomem * drivers/mtd/nand/onenand/onenand_omap2.c:444:9: sparse: expected void *dest drivers/mtd/nand/onenand/onenand_omap2.c:444:9: sparse: got void [noderef] __iomem * vim +/tmp_pmd_table +30 arch/arm/mm/kasan_init.c 5615f69bc20974 Linus Walleij 2020-10-25 29 5615f69bc20974 Linus Walleij 2020-10-25 @30 pmd_t tmp_pmd_table[PTRS_PER_PMD] __page_aligned_bss; 5615f69bc20974 Linus Walleij 2020-10-25 31 :::::: The code at line 30 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