Hi Krzysztof, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: bb5baaa9238ecf8f13b112232c7bbe0d3d598ee8 commit: 4a2d5f663dab6614772d8e28ca190b127ba46d9d i2c: Enable compile testing for more drivers date: 7 months ago config: riscv-randconfig-s031-20200812 (attached as .config) compiler: riscv64-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: v0.6.2-168-g9554805c-dirty git checkout 4a2d5f663dab6614772d8e28ca190b127ba46d9d # 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=riscv 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/i2c/busses/i2c-mlxcpld.c:97:17: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:97:17: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:97:17: sparse: expected void volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:99:17: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:99:17: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:99:17: sparse: expected void volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:99:17: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:107:38: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:107:38: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:107:38: sparse: expected void const volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:107:38: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:109:31: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:109:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:109:31: sparse: expected void const volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:109:31: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:119:27: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:119:27: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:119:27: sparse: expected void const volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:119:27: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:122:34: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:122:34: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:122:34: sparse: expected void const volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:122:34: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:125:34: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:125:34: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:125:34: sparse: expected void const volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:125:34: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:126:31: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:126:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:126:31: sparse: expected void const volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:126:31: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:129:34: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:129:34: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:129:34: sparse: expected void const volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:129:34: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:144:17: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:144:17: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:144:17: sparse: expected void volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:144:17: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:147:17: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:147:17: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:147:17: sparse: expected void volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:147:17: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:150:17: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:150:17: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:150:17: sparse: expected void volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:150:17: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:151:17: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:151:17: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:151:17: sparse: expected void volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:151:17: sparse: got void * drivers/i2c/busses/i2c-mlxcpld.c:154:17: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/i2c/busses/i2c-mlxcpld.c:154:17: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] <asn:2> *addr @@ got void * @@ drivers/i2c/busses/i2c-mlxcpld.c:154:17: sparse: expected void volatile [noderef] <asn:2> *addr drivers/i2c/busses/i2c-mlxcpld.c:154:17: sparse: got void * vim +97 drivers/i2c/busses/i2c-mlxcpld.c 6bec23bff91491 Vadim Pasternak 2016-11-20 91 6bec23bff91491 Vadim Pasternak 2016-11-20 92 static void mlxcpld_i2c_lpc_write_buf(u8 *data, u8 len, u32 addr) 6bec23bff91491 Vadim Pasternak 2016-11-20 93 { 6bec23bff91491 Vadim Pasternak 2016-11-20 94 int i; 6bec23bff91491 Vadim Pasternak 2016-11-20 95 6bec23bff91491 Vadim Pasternak 2016-11-20 96 for (i = 0; i < len - len % 4; i += 4) 6bec23bff91491 Vadim Pasternak 2016-11-20 @97 outl(*(u32 *)(data + i), addr + i); 6bec23bff91491 Vadim Pasternak 2016-11-20 98 for (; i < len; ++i) 6bec23bff91491 Vadim Pasternak 2016-11-20 99 outb(*(data + i), addr + i); 6bec23bff91491 Vadim Pasternak 2016-11-20 100 } 6bec23bff91491 Vadim Pasternak 2016-11-20 101 :::::: The code at line 97 was first introduced by commit :::::: 6bec23bff914915822f2c34d0555902fb2b9be1f i2c: mlxcpld: add master driver for mellanox systems :::::: TO: Vadim Pasternak <vadimp(a)mellanox.com&gt; :::::: CC: Wolfram Sang <wsa(a)the-dreams.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org