[linux-next:master 10253/10591] drivers/fpga/xilinx-pr-decoupler.c:94:34: warning: unused variable 'xlnx_pr_decoupler_of_match'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   2a860505b617cf8fda4ebff6cf05d3f774145440
commit: 8c966aadcc023c8db7a9d24a3a504a9b39b1202c [10253/10591] fpga: Use device_get_match_data()
config: hexagon-randconfig-r021-20221128 (https://download.01.org/0day-ci/archive/20231010/202310100247.Y7BFcalX-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/20231010/202310100247.Y7BFcalX-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/202310100247.Y7BFcalX-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/fpga/xilinx-pr-decoupler.c:11:
   In file included from include/linux/io.h:13:
   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/xilinx-pr-decoupler.c:11:
   In file included from include/linux/io.h:13:
   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/xilinx-pr-decoupler.c:11:
   In file included from include/linux/io.h:13:
   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/xilinx-pr-decoupler.c:94:34: warning: unused variable 'xlnx_pr_decoupler_of_match' [-Wunused-const-variable]
   static const struct of_device_id xlnx_pr_decoupler_of_match[] = {
                                    ^
   7 warnings generated.


vim +/xlnx_pr_decoupler_of_match +94 drivers/fpga/xilinx-pr-decoupler.c

30a2ac9a8bb5fce1 Nava kishore Manne 2021-02-11   93  
7e961c12be424c6c Moritz Fischer     2017-03-24  @94  static const struct of_device_id xlnx_pr_decoupler_of_match[] = {
30a2ac9a8bb5fce1 Nava kishore Manne 2021-02-11   95  	{ .compatible = "xlnx,pr-decoupler-1.00", .data = &decoupler_config },
30a2ac9a8bb5fce1 Nava kishore Manne 2021-02-11   96  	{ .compatible = "xlnx,pr-decoupler", .data = &decoupler_config },
30a2ac9a8bb5fce1 Nava kishore Manne 2021-02-11   97  	{ .compatible = "xlnx,dfx-axi-shutdown-manager-1.00",
30a2ac9a8bb5fce1 Nava kishore Manne 2021-02-11   98  					.data = &shutdown_config },
30a2ac9a8bb5fce1 Nava kishore Manne 2021-02-11   99  	{ .compatible = "xlnx,dfx-axi-shutdown-manager",
30a2ac9a8bb5fce1 Nava kishore Manne 2021-02-11  100  					.data = &shutdown_config },
7e961c12be424c6c Moritz Fischer     2017-03-24  101  	{},
7e961c12be424c6c Moritz Fischer     2017-03-24  102  };
7e961c12be424c6c Moritz Fischer     2017-03-24  103  MODULE_DEVICE_TABLE(of, xlnx_pr_decoupler_of_match);
7e961c12be424c6c Moritz Fischer     2017-03-24  104  

:::::: The code at line 94 was first introduced by commit
:::::: 7e961c12be424c6c1e355d469cc1b82dbf3af718 fpga: Add support for Xilinx LogiCORE PR Decoupler

:::::: TO: Moritz Fischer <mdf@kernel.org>
:::::: CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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