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: nios2-allyesconfig (attached as .config)
compiler: nios2-linux-gcc (GCC) 9.3.0
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/0day-ci/linux/commit/063ac5682a9b21093065d2025ab3fbf8e92864ae
        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 063ac5682a9b21093065d2025ab3fbf8e92864ae
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nios2 

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-uhs2.c:357:6: warning: no previous prototype for 'sdhci_uhs2_set_ios' [-Wmissing-prototypes]
     357 | void sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         |      ^~~~~~~~~~~~~~~~~~
   drivers/mmc/host/sdhci-uhs2.c:394:12: warning: 'sdhci_uhs2_host_ops_init' defined but not used [-Wunused-function]
     394 | static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~

vim +/sdhci_uhs2_set_ios +357 drivers/mmc/host/sdhci-uhs2.c

   356	
 > 357	void sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
   358	{
   359		struct sdhci_host *host = mmc_priv(mmc);
   360	
   361		if (!(host->version >= SDHCI_SPEC_400) ||
   362		    !(host->mmc->flags & MMC_UHS2_SUPPORT &&
   363		      host->mmc->caps & MMC_CAP_UHS2)) {
   364			sdhci_set_ios(mmc, ios);
   365			return;
   366		}
   367	
   368		if (ios->power_mode == MMC_POWER_UNDEFINED)
   369			return;
   370	
   371		if (host->flags & SDHCI_DEVICE_DEAD) {
   372			if (!IS_ERR(mmc->supply.vmmc) &&
   373			    ios->power_mode == MMC_POWER_OFF)
   374				mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
   375			if (!IS_ERR_OR_NULL(mmc->supply.vmmc2) &&
   376			    ios->power_mode == MMC_POWER_OFF)
   377				mmc_regulator_set_ocr(mmc, mmc->supply.vmmc2, 0);
   378			return;
   379		}
   380	
   381		/* FIXME: host->timing = ios->timing */
   382	
   383		sdhci_set_ios_common(mmc, ios);
   384	
   385		__sdhci_uhs2_set_ios(mmc, ios);
   386	}
   387	

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