[linux-next:master 11413/12130] drivers/fpga/altera-ps-spi.c:74:34: warning: unused variable 'of_ef_match'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   e3b18f7200f45d66f7141136c25554ac1e82009b
commit: 97b15ccc1517033df349c32723651f31c9c1f264 [11413/12130] fpga: altera-ps-spi: Use spi_get_device_match_data()
config: hexagon-randconfig-r011-20211004 (https://download.01.org/0day-ci/archive/20231013/202310132128.grw00tS2-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231013/202310132128.grw00tS2-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310132128.grw00tS2-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/fpga/altera-ps-spi.c:22:
   In file included from include/linux/spi/spi.h:17:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:337:
   include/asm-generic/io.h:547:31: 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:560:61: 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/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/fpga/altera-ps-spi.c:22:
   In file included from include/linux/spi/spi.h:17:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:337:
   include/asm-generic/io.h:573:61: 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/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/fpga/altera-ps-spi.c:22:
   In file included from include/linux/spi/spi.h:17:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:337:
   include/asm-generic/io.h:584:33: 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:594:59: 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:604:59: 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);
                                                         ~~~~~~~~~~ ^
>> drivers/fpga/altera-ps-spi.c:74:34: warning: unused variable 'of_ef_match' [-Wunused-const-variable]
   static const struct of_device_id of_ef_match[] = {
                                    ^
   7 warnings generated.


vim +/of_ef_match +74 drivers/fpga/altera-ps-spi.c

5692fae0742df7 Joshua Clayton 2017-06-14  73  
5692fae0742df7 Joshua Clayton 2017-06-14 @74  static const struct of_device_id of_ef_match[] = {
5692fae0742df7 Joshua Clayton 2017-06-14  75  	{ .compatible = "altr,fpga-passive-serial", .data = &c5_data },
5692fae0742df7 Joshua Clayton 2017-06-14  76  	{ .compatible = "altr,fpga-arria10-passive-serial", .data = &a10_data },
5692fae0742df7 Joshua Clayton 2017-06-14  77  	{}
5692fae0742df7 Joshua Clayton 2017-06-14  78  };
5692fae0742df7 Joshua Clayton 2017-06-14  79  MODULE_DEVICE_TABLE(of, of_ef_match);
5692fae0742df7 Joshua Clayton 2017-06-14  80  

:::::: The code at line 74 was first introduced by commit
:::::: 5692fae0742df7587189174b1cba364d22846c85 fpga manager: Add altera-ps-spi driver for Altera FPGAs

:::::: TO: Joshua Clayton <stillcompiling@gmail.com>
:::::: CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki