tree:   git://github.com/linux-chenxing/linux.git rperier-rtc
head:   c3937f8420a5b44e0a7779c71519bb957a978ad5
commit: 2a634e5f7844b41d99f96989a044b2b183b42ecc [5/9] rtc: Add support for the MSTAR MSC313 RTC
config: sparc-allyesconfig (attached as .config)
compiler: sparc64-linux-gcc (GCC) 11.2.0
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/linux-chenxing/linux/commit/2a634e5f7844b41d99f96989a044b2b183b42ecc
        git remote add linux-chenxing git://github.com/linux-chenxing/linux.git
        git fetch --no-tags linux-chenxing rperier-rtc
        git checkout 2a634e5f7844b41d99f96989a044b2b183b42ecc
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=sparc 

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/rtc/rtc-msc313.c: In function 'msc313_rtc_read_alarm':
>> drivers/rtc/rtc-msc313.c:55:19: error: implicit declaration of function 'readw' [-Werror=implicit-function-declaration]
      55 |         seconds = readw(priv->rtc_base + REG_RTC_MATCH_VAL_L)
         |                   ^~~~~
   drivers/rtc/rtc-msc313.c: In function 'msc313_rtc_alarm_irq_enable':
>> drivers/rtc/rtc-msc313.c:76:9: error: implicit declaration of function 'writew' [-Werror=implicit-function-declaration]
      76 |         writew(reg, priv->rtc_base + REG_RTC_CTRL);
         |         ^~~~~~
   cc1: some warnings being treated as errors


vim +/readw +55 drivers/rtc/rtc-msc313.c

    49	
    50	static int msc313_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
    51	{
    52		struct msc313_rtc *priv = dev_get_drvdata(dev);
    53		unsigned long seconds;
    54	
  > 55		seconds = readw(priv->rtc_base + REG_RTC_MATCH_VAL_L)
    56				| (readw(priv->rtc_base + REG_RTC_MATCH_VAL_H) << 16);
    57	
    58		rtc_time64_to_tm(seconds, &alarm->time);
    59	
    60		if (!(readw(priv->rtc_base + REG_RTC_CTRL) & INT_MASK_BIT))
    61			alarm->enabled = 1;
    62	
    63		return 0;
    64	}
    65	
    66	static int msc313_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
    67	{
    68		struct msc313_rtc *priv = dev_get_drvdata(dev);
    69		u16 reg;
    70	
    71		reg = readw(priv->rtc_base + REG_RTC_CTRL);
    72		if (enabled)
    73			reg &= ~INT_MASK_BIT;
    74		else
    75			reg |= INT_MASK_BIT;
  > 76		writew(reg, priv->rtc_base + REG_RTC_CTRL);
    77		return 0;
    78	}
    79	

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