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 <l...@intel.com>


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:97:17: sparse:     got void *
   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 <vad...@mellanox.com>
:::::: CC: Wolfram Sang <w...@the-dreams.de>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org

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