Hi AKASHI,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on linus/master]
[also build test WARNING on v5.10-rc2]
[cannot apply to v3.1 next-20201105]
[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]

url:    https://github.com/0day-ci/linux/commits/AKASHI-Takahiro/Add-support-UHS-II-for-GL9755/20201106-103058
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 521b619acdc8f1f5acdac15b84f81fd9515b2aff
config: m68k-randconfig-s032-20201105 (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-76-gf680124b-dirty
        # https://github.com/0day-ci/linux/commit/4e653e20c1f49dae1e8a8a5cbc16a10e7121ea2e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review AKASHI-Takahiro/Add-support-UHS-II-for-GL9755/20201106-103058
        git checkout 4e653e20c1f49dae1e8a8a5cbc16a10e7121ea2e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=m68k 

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/sdhci.c:367:6: warning: no previous prototype for '__sdhci_led_activate' [-Wmissing-prototypes]
     367 | void __sdhci_led_activate(struct sdhci_host *host)
         |      ^~~~~~~~~~~~~~~~~~~~
>> drivers/mmc/host/sdhci.c:380:6: warning: no previous prototype for '__sdhci_led_deactivate' [-Wmissing-prototypes]
     380 | void __sdhci_led_deactivate(struct sdhci_host *host)
         |      ^~~~~~~~~~~~~~~~~~~~~~
>> drivers/mmc/host/sdhci.c:1614:6: warning: no previous prototype for 'sdhci_finish_data' [-Wmissing-prototypes]
    1614 | void sdhci_finish_data(struct sdhci_host *host)
         |      ^~~~~~~~~~~~~~~~~

vim +/__sdhci_led_activate +367 drivers/mmc/host/sdhci.c

   366	
 > 367	void __sdhci_led_activate(struct sdhci_host *host)
   368	{
   369		u8 ctrl;
   370	
   371		if (host->quirks & SDHCI_QUIRK_NO_LED)
   372			return;
   373	
   374		ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
   375		ctrl |= SDHCI_CTRL_LED;
   376		sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
   377	}
   378	EXPORT_SYMBOL_GPL(__sdhci_led_activate);
   379	
 > 380	void __sdhci_led_deactivate(struct sdhci_host *host)
   381	{
   382		u8 ctrl;
   383	
   384		if (host->quirks & SDHCI_QUIRK_NO_LED)
   385			return;
   386	
   387		ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
   388		ctrl &= ~SDHCI_CTRL_LED;
   389		sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
   390	}
   391	EXPORT_SYMBOL_GPL(__sdhci_led_deactivate);
   392	

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