Re: [PATCH v2 1/3] nvmem: core: introduce cells parser

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Hi Vadym,

I love your patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linux/master linus/master v5.13-rc5 next-20210608]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Vadym-Kochan/nvmem-add-ONIE-NVMEM-cells-parser/20210609-031008
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: s390-randconfig-r012-20210608 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d2012d965d60c3258b3a69d024491698f8aec386)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/0day-ci/linux/commit/e7cd03f23c4980914d9de330fd018cb733f84d8f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Vadym-Kochan/nvmem-add-ONIE-NVMEM-cells-parser/20210609-031008
        git checkout e7cd03f23c4980914d9de330fd018cb733f84d8f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   In file included from lib/vsprintf.c:36:
   In file included from include/linux/rtc.h:18:
>> include/linux/nvmem-provider.h:183:9: warning: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct nvmem_parser *' [-Wint-conversion]
           return -EOPNOTSUPP;
                  ^~~~~~~~~~~
   In file included from lib/vsprintf.c:40:
   In file included from include/net/addrconf.h:50:
   In file included from include/linux/ipv6.h:88:
   In file included from include/linux/tcp.h:17:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
                                                             ^
   include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
   #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
                                                        ^
   In file included from lib/vsprintf.c:40:
   In file included from include/net/addrconf.h:50:
   In file included from include/linux/ipv6.h:88:
   In file included from include/linux/tcp.h:17:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
   #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
                                                        ^
   In file included from lib/vsprintf.c:40:
   In file included from include/net/addrconf.h:50:
   In file included from include/linux/ipv6.h:88:
   In file included from include/linux/tcp.h:17:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsb(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsw(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsl(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesb(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesw(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesl(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   13 warnings generated.
--
   In file included from lib/test_printf.c:13:
   In file included from include/linux/rtc.h:18:
>> include/linux/nvmem-provider.h:183:9: warning: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct nvmem_parser *' [-Wint-conversion]
           return -EOPNOTSUPP;
                  ^~~~~~~~~~~
   lib/test_printf.c:157:52: warning: format specifies type 'unsigned char' but the argument has type 'int' [-Wformat]
           test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
                                  ~~~~                       ^
                                  %d
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:157:55: warning: format specifies type 'unsigned char' but the argument has type 'int' [-Wformat]
           test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
                                       ~~~~                     ^
                                       %d
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:157:58: warning: format specifies type 'unsigned char' but the argument has type 'int' [-Wformat]
           test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
                                            ~~~~                   ^~~
                                            %d
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:157:63: warning: format specifies type 'unsigned char' but the argument has type 'int' [-Wformat]
           test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
                                                 ~~~~                   ^~~
                                                 %d
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:157:68: warning: format specifies type 'unsigned char' but the argument has type 'int' [-Wformat]
           test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
                                                      ~~~~                   ^~
                                                      %d
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:158:52: warning: format specifies type 'char' but the argument has type 'int' [-Wformat]
           test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
                                  ~~~~                       ^
                                  %d
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:158:55: warning: format specifies type 'char' but the argument has type 'int' [-Wformat]
           test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
                                       ~~~~                     ^
                                       %d
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:158:58: warning: format specifies type 'char' but the argument has type 'int' [-Wformat]
           test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
                                            ~~~~                   ^~~
                                            %d
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:158:63: warning: format specifies type 'char' but the argument has type 'int' [-Wformat]
           test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
                                                 ~~~~                   ^~~
                                                 %d
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:158:68: warning: format specifies type 'char' but the argument has type 'int' [-Wformat]
           test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
                                                      ~~~~                   ^~
                                                      %d
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:159:41: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat]
           test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
                                     ~~~          ^~~~
                                     %o
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:159:47: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat]
           test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
                                        ~~~             ^~~~
                                        %o
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   lib/test_printf.c:159:53: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat]
           test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
                                           ~~~~               ^~~~~~
                                           %#o
   lib/test_printf.c:137:40: note: expanded from macro 'test'
           __test(expect, strlen(expect), fmt, ##__VA_ARGS__)
                                          ~~~    ^~~~~~~~~~~
   14 warnings generated.
--
   In file included from block/partitions/msdos.c:31:
   In file included from block/partitions/check.h:3:
   In file included from include/linux/blkdev.h:25:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
                                                             ^
   include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
   #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
                                                        ^
   In file included from block/partitions/msdos.c:31:
   In file included from block/partitions/check.h:3:
   In file included from include/linux/blkdev.h:25:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
   #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
                                                        ^
   In file included from block/partitions/msdos.c:31:
   In file included from block/partitions/check.h:3:
   In file included from include/linux/blkdev.h:25:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsb(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsw(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsl(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesb(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesw(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesl(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   In file included from block/partitions/msdos.c:32:
   In file included from block/partitions/efi.h:20:
   In file included from include/linux/efi.h:20:
   In file included from include/linux/rtc.h:18:
>> include/linux/nvmem-provider.h:183:9: warning: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct nvmem_parser *' [-Wint-conversion]
           return -EOPNOTSUPP;
                  ^~~~~~~~~~~
   13 warnings generated.
--
   In file included from kernel/time/ntp.c:10:
   In file included from include/linux/clocksource.h:22:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
                                                             ^
   include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
   #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
                                                        ^
   In file included from kernel/time/ntp.c:10:
   In file included from include/linux/clocksource.h:22:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
   #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
                                                        ^
   In file included from kernel/time/ntp.c:10:
   In file included from include/linux/clocksource.h:22:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsb(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsw(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsl(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesb(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesw(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesl(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   In file included from kernel/time/ntp.c:19:
   In file included from include/linux/rtc.h:18:
>> include/linux/nvmem-provider.h:183:9: warning: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct nvmem_parser *' [-Wint-conversion]
           return -EOPNOTSUPP;
                  ^~~~~~~~~~~
   kernel/time/ntp.c:245:19: warning: unused function 'ntp_synced' [-Wunused-function]
   static inline int ntp_synced(void)
                     ^
   14 warnings generated.
..


vim +183 include/linux/nvmem-provider.h

   179	
   180	static inline struct nvmem_parser *
   181	nvmem_parser_register(const struct nvmem_parser_config *config)
   182	{
 > 183		return -EOPNOTSUPP;
   184	}
   185	

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

Attachment: .config.gz
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