Re: [PATCH v1 2/9] hwmon: (gxp_fan_ctrl) Give GPIO access to fan data

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

Hi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on groeck-staging/hwmon-next]
[also build test WARNING on robh/for-next linus/master v6.3-rc7]
[cannot apply to brgl/gpio/for-next next-20230418]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/nick-hawkins-hpe-com/gpio-gxp-Add-HPE-GXP-GPIO/20230418-233513
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
patch link:    https://lore.kernel.org/r/20230418152824.110823-3-nick.hawkins%40hpe.com
patch subject: [PATCH v1 2/9] hwmon: (gxp_fan_ctrl) Give GPIO access to fan data
config: hexagon-randconfig-r045-20230419 (https://download.01.org/0day-ci/archive/20230419/202304192243.9hwJ1Cad-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 437b7602e4a998220871de78afcb020b9c14a661)
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
        # https://github.com/intel-lab-lkp/linux/commit/be3722d7f32fea1ea375090d05cbfdd3dd4e04d3
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review nick-hawkins-hpe-com/gpio-gxp-Add-HPE-GXP-GPIO/20230418-233513
        git checkout be3722d7f32fea1ea375090d05cbfdd3dd4e04d3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash block/partitions/ drivers/hwmon/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304192243.9hwJ1Cad-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/hwmon/gxp-fan-ctrl.c:7:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:334:
   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/hwmon/gxp-fan-ctrl.c:7:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:334:
   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/hwmon/gxp-fan-ctrl.c:7:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:334:
   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/hwmon/gxp-fan-ctrl.c:32:4: warning: no previous prototype for function 'get_fans_installed' [-Wmissing-prototypes]
   u8 get_fans_installed(void)
      ^
   drivers/hwmon/gxp-fan-ctrl.c:32:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   u8 get_fans_installed(void)
   ^
   static 
>> drivers/hwmon/gxp-fan-ctrl.c:52:4: warning: no previous prototype for function 'get_fans_failed' [-Wmissing-prototypes]
   u8 get_fans_failed(void)
      ^
   drivers/hwmon/gxp-fan-ctrl.c:52:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   u8 get_fans_failed(void)
   ^
   static 
   8 warnings generated.


vim +/get_fans_installed +32 drivers/hwmon/gxp-fan-ctrl.c

    31	
  > 32	u8 get_fans_installed(void)
    33	{
    34		static u8 val;
    35	
    36		val = readb(drvdata->plreg + OFS_FAN_INST);
    37	
    38		return val;
    39	}
    40	EXPORT_SYMBOL(get_fans_installed);
    41	
    42	static long fan_failed(struct device *dev, int fan)
    43	{
    44		struct gxp_fan_ctrl_drvdata *drvdata = dev_get_drvdata(dev);
    45		u8 val;
    46	
    47		val = readb(drvdata->plreg + OFS_FAN_FAIL);
    48	
    49		return !!(val & BIT(fan));
    50	}
    51	
  > 52	u8 get_fans_failed(void)
    53	{
    54		static u8 val;
    55	
    56		val = readb(drvdata->plreg + OFS_FAN_FAIL);
    57	
    58		return val;
    59	}
    60	EXPORT_SYMBOL(get_fans_failed);
    61	

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