[frank-w-bpi-r2-4.14:5.15-rc 7/21] drivers/soc/mediatek/mtk-pmic-wrap.c:2112:16: warning: no previous prototype for function 'pwrap_node_to_regmap'

[frank-w-bpi-r2-4.14:5.15-rc 7/21] drivers/soc/mediatek/mtk-pmic-wrap.c:2112:16: warning: no previous prototype for function 'pwrap_node_to_regmap'

[kernel test robot]

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tree:   https://github.com/frank-w/BPI-R2-4.14 5.15-rc
head:   cfa07bcc9a852f495b9aea8f324121854b40d13b
commit: e01c5f1b881458c2738c2ba42fe073bb1de045b3 [7/21] mt6625l: add changes outside driver dir
config: riscv-randconfig-r036-20210916 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c8b3d7d6d6de37af68b2f379d0e37304f78e115f)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/frank-w/BPI-R2-4.14/commit/e01c5f1b881458c2738c2ba42fe073bb1de045b3
        git remote add frank-w-bpi-r2-4.14 https://github.com/frank-w/BPI-R2-4.14
        git fetch --no-tags frank-w-bpi-r2-4.14 5.15-rc
        git checkout e01c5f1b881458c2738c2ba42fe073bb1de045b3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 

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

All warnings (new ones prefixed by >>):

   In file included from drivers/soc/mediatek/mtk-pmic-wrap.c:7:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   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/little_endian.h:36:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/soc/mediatek/mtk-pmic-wrap.c:7:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   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/little_endian.h:34:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/soc/mediatek/mtk-pmic-wrap.c:7:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   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:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
                                                     ~~~~~~~~~~ ^
>> drivers/soc/mediatek/mtk-pmic-wrap.c:2112:16: warning: no previous prototype for function 'pwrap_node_to_regmap' [-Wmissing-prototypes]
   struct regmap *pwrap_node_to_regmap(struct device_node *np)
                  ^
   drivers/soc/mediatek/mtk-pmic-wrap.c:2112:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct regmap *pwrap_node_to_regmap(struct device_node *np)
   ^
   static 
   8 warnings generated.


vim +/pwrap_node_to_regmap +2112 drivers/soc/mediatek/mtk-pmic-wrap.c

  2111	
> 2112	struct regmap *pwrap_node_to_regmap(struct device_node *np)
  2113	{
  2114		struct platform_device *pdev;
  2115		struct pmic_wrapper *wrp;
  2116		pdev = of_find_device_by_node(np);
  2117		if (!pdev)
  2118			return ERR_PTR(-ENODEV);
  2119		wrp = platform_get_drvdata(pdev);
  2120		return wrp->regmap;
  2121	}
  2122	EXPORT_SYMBOL_GPL(pwrap_node_to_regmap);
  2123	

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

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