[thomas-weissschuh:b4/vdso-alarm-clocks 3/5] kernel/time/alarmtimer.c:105:undefined reference to `vdso_time_enable_alarmclock'

[thomas-weissschuh:b4/vdso-alarm-clocks 3/5] kernel/time/alarmtimer.c:105:undefined reference to `vdso_time_enable_alarmclock'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/vdso-alarm-clocks
head:   c8bb37f3267c7cbf3aed873255994d37a43122c9
commit: 16c670855b6263e33441b6502dd778778a33ae69 [3/5] vdso: Add alarmclock support infrastructure
config: csky-randconfig-r2200-20261016 (https://download.01.org/0day-ci/archive/20261016/202610161018.bTkFTUke-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 14.3.0
smatch: v0.5.0-9187-g5189e3fb
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261016/202610161018.bTkFTUke-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610161018.bTkFTUke-lkp@intel.com/

All errors (new ones prefixed by >>):

   csky-linux-ld: kernel/time/alarmtimer.o: in function `alarmtimer_rtc_add_device':
>> kernel/time/alarmtimer.c:105:(.text+0x8f0): undefined reference to `vdso_time_enable_alarmclock'
   csky-linux-ld: kernel/time/alarmtimer.o: in function `__srcu_read_lock':
>> include/linux/srcutiny.h:90:(.text+0x9a8): undefined reference to `vdso_time_enable_alarmclock'


vim +105 kernel/time/alarmtimer.c

    82	
    83	static int alarmtimer_rtc_add_device(struct device *dev)
    84	{
    85		struct rtc_device *rtc = to_rtc_device(dev);
    86		struct platform_device *pdev;
    87		int ret = 0;
    88	
    89		if (rtcdev)
    90			return -EBUSY;
    91	
    92		if (!test_bit(RTC_FEATURE_ALARM, rtc->features))
    93			return -1;
    94		if (!device_may_wakeup(rtc->dev.parent))
    95			return -1;
    96	
    97		pdev = platform_device_register_data(dev, "alarmtimer",
    98						     PLATFORM_DEVID_AUTO, NULL, 0);
    99		if (!IS_ERR(pdev))
   100			device_init_wakeup(&pdev->dev, true);
   101	
   102		scoped_guard(spinlock_irqsave, &rtcdev_lock) {
   103			if (!IS_ERR(pdev) && !rtcdev && try_module_get(rtc->owner)) {
   104				rtcdev = rtc;
 > 105				vdso_time_enable_alarmclock();
   106				/* hold a reference so it doesn't go away */
   107				get_device(dev);
   108				pdev = NULL;
   109			} else {
   110				ret = -1;
   111			}
   112		}
   113	
   114		platform_device_unregister(pdev);
   115		return ret;
   116	}
   117	

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