Hi Yoshihiro,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on renesas-devel/next]
[also build test ERROR on regulator/for-next v5.8-rc2 next-20200626]
[cannot apply to ulf.hansson-mmc/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Yoshihiro-Shimoda/treewide-add-regulator-condition-on-_mmc_suspend/20200626-173437
base:   https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-devel.git next
config: arc-allyesconfig (attached as .config)
compiler: arc-elf-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
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 

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

All errors (new ones prefixed by >>):

   drivers/regulator/core.c:3805:5: warning: no previous prototype for 'regulator_suspend_enable' [-Wmissing-prototypes]
    3805 | int regulator_suspend_enable(struct regulator_dev *rdev,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~
   drivers/regulator/core.c:3812:5: warning: no previous prototype for 'regulator_suspend_disable' [-Wmissing-prototypes]
    3812 | int regulator_suspend_disable(struct regulator_dev *rdev,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/regulator/core.c:3851:5: warning: no previous prototype for 'regulator_set_suspend_voltage' [-Wmissing-prototypes]
    3851 | int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/regulator/core.c:5379:13: error: 'regulator_prepare' undeclared here (not in a function); did you mean 'regulator_resume'?
    5379 |  .prepare = regulator_prepare,
         |             ^~~~~~~~~~~~~~~~~
         |             regulator_resume
>> drivers/regulator/core.c:5380:18: error: 'regulator_resume_early' undeclared here (not in a function); did you mean 'regulator_resume'?
    5380 |  .resume_early = regulator_resume_early,
         |                  ^~~~~~~~~~~~~~~~~~~~~~
         |                  regulator_resume
   In file included from include/linux/perf_event.h:25,
                    from include/linux/trace_events.h:10,
                    from include/trace/trace_events.h:21,
                    from include/trace/define_trace.h:102,
                    from include/trace/events/regulator.h:174,
                    from drivers/regulator/core.c:31:
   arch/arc/include/asm/perf_event.h:126:23: warning: 'arc_pmu_cache_map' defined but not used [-Wunused-const-variable=]
     126 | static const unsigned arc_pmu_cache_map[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
         |                       ^~~~~~~~~~~~~~~~~
   arch/arc/include/asm/perf_event.h:91:27: warning: 'arc_pmu_ev_hw_map' defined but not used [-Wunused-const-variable=]
      91 | static const char * const arc_pmu_ev_hw_map[] = {
         |                           ^~~~~~~~~~~~~~~~~

vim +5379 drivers/regulator/core.c

  5376	
  5377	#ifdef CONFIG_PM
  5378	static const struct dev_pm_ops __maybe_unused regulator_pm_ops = {
> 5379		.prepare	= regulator_prepare,
> 5380		.resume_early	= regulator_resume_early,
  5381		.suspend	= regulator_suspend,
  5382		.resume		= regulator_resume,
  5383	};
  5384	#endif
  5385	

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