Hi Will, First bad commit (maybe != root cause): tree: https://android.googlesource.com/kernel/common android-5.4 head: adcba6dd6d36e490e4477a9cf4f1c251c16dbbda commit: 6d83d361e7522c5021961bd8826798a74f943aa0 [15/19] FROMLIST: iommu/arm-smmu-v3: Allow building as a module config: arm64-randconfig-s032-20210119 (attached as .config) compiler: aarch64-linux-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: v0.6.3-208-g46a52ca4-dirty git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android-5.4 git checkout 6d83d361e7522c5021961bd8826798a74f943aa0 # 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__' ARCH=arm64 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/iommu/arm-smmu-v3.c:816:26: sparse: sparse: cast to restricted __le64 drivers/iommu/arm-smmu-v3.c:816:26: sparse: sparse: cast to restricted __le64 drivers/iommu/arm-smmu-v3.c:816:26: sparse: sparse: cast to restricted __le64 drivers/iommu/arm-smmu-v3.c:816:26: sparse: sparse: cast to restricted __le64 drivers/iommu/arm-smmu-v3.c:816:26: sparse: sparse: cast to restricted __le64 drivers/iommu/arm-smmu-v3.c:816:26: sparse: sparse: cast to restricted __le64 drivers/iommu/arm-smmu-v3.c:816:26: sparse: sparse: cast to restricted __le64 drivers/iommu/arm-smmu-v3.c:816:26: sparse: sparse: cast to restricted __le64 drivers/iommu/arm-smmu-v3.c:816:26: sparse: sparse: cast to restricted __le64 drivers/iommu/arm-smmu-v3.c:816:26: sparse: sparse: cast to restricted __le64 drivers/iommu/arm-smmu-v3.c:816:24: sparse: expected restricted __le64 [usertype] drivers/iommu/arm-smmu-v3.c:816:24: sparse: got unsigned long long drivers/iommu/arm-smmu-v3.c:824:20: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected restricted __le64 [usertype] *[assigned] dst @@ got unsigned long long [usertype] *ent @@ drivers/iommu/arm-smmu-v3.c:824:20: sparse: expected restricted __le64 [usertype] *[assigned] dst drivers/iommu/arm-smmu-v3.c:824:20: sparse: got unsigned long long [usertype] *ent drivers/iommu/arm-smmu-v3.c:824:25: sparse: sparse: incorrect type in argument 2 (different base types) @@ expected unsigned long long [usertype] *[assigned] src @@ got restricted __le64 [usertype] * @@ drivers/iommu/arm-smmu-v3.c:824:25: sparse: expected unsigned long long [usertype] *[assigned] src drivers/iommu/arm-smmu-v3.c:824:25: sparse: got restricted __le64 [usertype] * drivers/iommu/arm-smmu-v3.c:974:20: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected restricted __le64 [usertype] *[assigned] dst @@ got unsigned long long * @@ drivers/iommu/arm-smmu-v3.c:974:20: sparse: expected restricted __le64 [usertype] *[assigned] dst drivers/iommu/arm-smmu-v3.c:974:20: sparse: got unsigned long long * drivers/iommu/arm-smmu-v3.c:974:25: sparse: sparse: incorrect type in argument 2 (different base types) @@ expected unsigned long long [usertype] *[assigned] src @@ got restricted __le64 [usertype] * @@ drivers/iommu/arm-smmu-v3.c:974:25: sparse: expected unsigned long long [usertype] *[assigned] src drivers/iommu/arm-smmu-v3.c:974:25: sparse: got restricted __le64 [usertype] * drivers/iommu/arm-smmu-v3.c:1653:53: sparse: sparse: incorrect type in argument 3 (different base types) @@ expected restricted __le64 [usertype] *dst @@ got unsigned long long [usertype] *strtab @@ drivers/iommu/arm-smmu-v3.c:1653:53: sparse: expected restricted __le64 [usertype] *dst drivers/iommu/arm-smmu-v3.c:1653:53: sparse: got unsigned long long [usertype] *strtab drivers/iommu/arm-smmu-v3.c:1681:39: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected unsigned long long [usertype] *[assigned] strtab @@ got restricted __le64 [usertype] *l2ptr @@ drivers/iommu/arm-smmu-v3.c:1681:39: sparse: expected unsigned long long [usertype] *[assigned] strtab drivers/iommu/arm-smmu-v3.c:1681:39: sparse: got restricted __le64 [usertype] *l2ptr drivers/iommu/arm-smmu-v3.c: note: in included file (through arch/arm64/include/asm/atomic.h, include/linux/atomic.h, include/asm-generic/bitops/atomic.h, ...): arch/arm64/include/asm/cmpxchg.h:172:1: sparse: sparse: cast truncates bits from constant value (ffffffff80000000 becomes 0) arch/arm64/include/asm/cmpxchg.h:172:1: sparse: sparse: cast truncates bits from constant value (ffffffff80000000 becomes 0) vim +816 drivers/iommu/arm-smmu-v3.c 48ec83bcbcf5090f Will Deacon 2015-05-27 810 48ec83bcbcf5090f Will Deacon 2015-05-27 811 static void queue_read(__le64 *dst, u64 *src, size_t n_dwords) 48ec83bcbcf5090f Will Deacon 2015-05-27 812 { 48ec83bcbcf5090f Will Deacon 2015-05-27 813 int i; 48ec83bcbcf5090f Will Deacon 2015-05-27 814 48ec83bcbcf5090f Will Deacon 2015-05-27 815 for (i = 0; i < n_dwords; ++i) 48ec83bcbcf5090f Will Deacon 2015-05-27 @816 *dst++ = le64_to_cpu(*src++); 48ec83bcbcf5090f Will Deacon 2015-05-27 817 } 48ec83bcbcf5090f Will Deacon 2015-05-27 818 :::::: The code at line 816 was first introduced by commit :::::: 48ec83bcbcf5090fcdf74a6168f161d247492979 iommu/arm-smmu: Add initial driver support for ARM SMMUv3 devices :::::: TO: Will Deacon <will.deacon(a)arm.com&gt; :::::: CC: Joerg Roedel <jroedel(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org