tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: fb57b1fabcb28f358901b2df90abd2b48abc1ca8 commit: 7b364f0949ae2dd205d5e9afa4b82ee17030d928 [7639/10701] READ_ONCE: Drop pointer qualifiers when reading from scalar types config: arm64-randconfig-s001-20200520 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-193-gb8fad4bc-dirty git checkout 7b364f0949ae2dd205d5e9afa4b82ee17030d928 # save the attached .config to linux build tree make W=1 C=1 ARCH=arm64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) -- arch/arm64/mm/kasan_init.c:71:24: sparse: sparse: cast to non-scalar arch/arm64/mm/kasan_init.c:71:24: sparse: sparse: cast from non-scalar arch/arm64/mm/kasan_init.c:70:24: sparse: sparse: cast to non-scalar arch/arm64/mm/kasan_init.c:70:24: sparse: sparse: cast from non-scalar arch/arm64/mm/kasan_init.c:77:13: sparse: sparse: cast to non-scalar arch/arm64/mm/kasan_init.c:77:13: sparse: sparse: cast from non-scalar arch/arm64/mm/kasan_init.c:84:54: sparse: sparse: cast to non-scalar arch/arm64/mm/kasan_init.c:84:54: sparse: sparse: cast from non-scalar arch/arm64/mm/kasan_init.c:84:24: sparse: sparse: cast to non-scalar arch/arm64/mm/kasan_init.c:84:24: sparse: sparse: cast from non-scalar arch/arm64/mm/kasan_init.c:90:22: sparse: sparse: cast to non-scalar arch/arm64/mm/kasan_init.c:90:22: sparse: sparse: cast from non-scalar arch/arm64/mm/kasan_init.c:114:54: sparse: sparse: cast to non-scalar arch/arm64/mm/kasan_init.c:114:54: sparse: sparse: cast from non-scalar arch/arm64/mm/kasan_init.c:126:54: sparse: sparse: cast to non-scalar arch/arm64/mm/kasan_init.c:126:54: sparse: sparse: cast from non-scalar arch/arm64/mm/kasan_init.c:138:54: sparse: sparse: cast to non-scalar arch/arm64/mm/kasan_init.c:138:54: sparse: sparse: cast from non-scalar arch/arm64/mm/kasan_init.c:184:17: sparse: sparse: cast to non-scalar arch/arm64/mm/kasan_init.c:184:17: sparse: sparse: cast from non-scalar vim +88 arch/arm64/kernel/efi.c f7d924894265794 Ard Biesheuvel 2015-11-30 84 8b1e0f81fb6fcf3 Anshuman Khandual 2019-07-11 85 static int __init set_permissions(pte_t *ptep, unsigned long addr, void *data) bd264d046aad25e Ard Biesheuvel 2016-06-29 86 { bd264d046aad25e Ard Biesheuvel 2016-06-29 87 efi_memory_desc_t *md = data; 20a004e7b017cce Will Deacon 2018-02-15 @88 pte_t pte = READ_ONCE(*ptep); bd264d046aad25e Ard Biesheuvel 2016-06-29 89 bd264d046aad25e Ard Biesheuvel 2016-06-29 90 if (md->attribute & EFI_MEMORY_RO) bd264d046aad25e Ard Biesheuvel 2016-06-29 91 pte = set_pte_bit(pte, __pgprot(PTE_RDONLY)); bd264d046aad25e Ard Biesheuvel 2016-06-29 92 if (md->attribute & EFI_MEMORY_XP) bd264d046aad25e Ard Biesheuvel 2016-06-29 93 pte = set_pte_bit(pte, __pgprot(PTE_PXN)); bd264d046aad25e Ard Biesheuvel 2016-06-29 94 set_pte(ptep, pte); bd264d046aad25e Ard Biesheuvel 2016-06-29 95 return 0; bd264d046aad25e Ard Biesheuvel 2016-06-29 96 } bd264d046aad25e Ard Biesheuvel 2016-06-29 97 :::::: The code at line 88 was first introduced by commit :::::: 20a004e7b017cce282a46ac5d02c2b9c6b9bb1fa arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables :::::: TO: Will Deacon <will.deacon(a)arm.com&gt; :::::: CC: Catalin Marinas <catalin.marinas(a)arm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org