[shenki:microwatt-v5.16 3/9] drivers/mmc/host/litex_mmc.c:96:6: warning: no previous prototype for function 'sdclk_set_clk'

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

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tree:   https://github.com/shenki/linux microwatt-v5.16
head:   8e96c87e7fba5fb249efd40842c26c2bb426d49c
commit: 332995960c8d441be0974f27a128b2856139074a [3/9] LiteX: driver for LiteSDCard (litex_mmc)
config: riscv-buildonly-randconfig-r003-20211119 (attached as .config)
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/shenki/linux/commit/332995960c8d441be0974f27a128b2856139074a
        git remote add shenki https://github.com/shenki/linux
        git fetch --no-tags shenki microwatt-v5.16
        git checkout 332995960c8d441be0974f27a128b2856139074a
        # 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 >>):

>> drivers/mmc/host/litex_mmc.c:96:6: warning: no previous prototype for function 'sdclk_set_clk' [-Wmissing-prototypes]
   void sdclk_set_clk(struct litex_mmc_host *host, unsigned int clk_freq) {
        ^
   drivers/mmc/host/litex_mmc.c:96:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void sdclk_set_clk(struct litex_mmc_host *host, unsigned int clk_freq) {
   ^
   static 
   1 warning generated.


vim +/sdclk_set_clk +96 drivers/mmc/host/litex_mmc.c

    94	
    95	
  > 96	void sdclk_set_clk(struct litex_mmc_host *host, unsigned int clk_freq) {
    97		u32 div = clk_freq ? host->freq / clk_freq : 256;
    98		div = roundup_pow_of_two(div);
    99		div = min(max(div, (u32)2), (u32)256);
   100		dev_info(&host->dev->dev,
   101			"Requested clk_freq=%d: set to %d via div=%d\n",
   102			clk_freq, host->freq / div, div);
   103		litex_write16(host->sdphy + LITEX_MMC_SDPHY_CLOCKERDIV_OFF, div);
   104	}
   105	

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

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