Re: [PATCH 3/5] net: ethernet: renesas: Add Ethernet Switch driver

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

Hi Yoshihiro,

I love your patch! Perhaps something to improve:

[auto build test WARNING on next-20220909]
[also build test WARNING on v6.0-rc4]
[cannot apply to geert-renesas-devel/next net-next/master net/master linus/master v6.0-rc4 v6.0-rc3 v6.0-rc2]
[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/Yoshihiro-Shimoda/treewide-Add-R-Car-S4-8-Ethernet-Switch-support/20220909-212759
base:    9a82ccda91ed2b40619cb3c10d446ae1f97bab6e
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20220910/202209100156.WIC248Uh-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 12.1.0
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/9c5c4dd0ca6beb269dd0a6ef12c386198e193c68
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Yoshihiro-Shimoda/treewide-Add-R-Car-S4-8-Ethernet-Switch-support/20220909-212759
        git checkout 9c5c4dd0ca6beb269dd0a6ef12c386198e193c68
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash M=drivers/net/ethernet/renesas

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

All warnings (new ones prefixed by >>):

>> drivers/net/ethernet/renesas/rswitch_serdes.c:16:6: warning: no previous prototype for 'rswitch_serdes_write32' [-Wmissing-prototypes]
      16 | void rswitch_serdes_write32(void __iomem *addr, u32 offs,  u32 bank, u32 data)
         |      ^~~~~~~~~~~~~~~~~~~~~~
>> drivers/net/ethernet/renesas/rswitch_serdes.c:22:5: warning: no previous prototype for 'rswitch_serdes_read32' [-Wmissing-prototypes]
      22 | u32 rswitch_serdes_read32(void __iomem *addr, u32 offs,  u32 bank)
         |     ^~~~~~~~~~~~~~~~~~~~~


vim +/rswitch_serdes_write32 +16 drivers/net/ethernet/renesas/rswitch_serdes.c

    15	
  > 16	void rswitch_serdes_write32(void __iomem *addr, u32 offs,  u32 bank, u32 data)
    17	{
    18		iowrite32(bank, addr + RSWITCH_SERDES_BANK_SELECT);
    19		iowrite32(data, addr + offs);
    20	}
    21	
  > 22	u32 rswitch_serdes_read32(void __iomem *addr, u32 offs,  u32 bank)
    23	{
    24		iowrite32(bank, addr + RSWITCH_SERDES_BANK_SELECT);
    25	
    26		return ioread32(addr + offs);
    27	}
    28	

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