./include/linux/math64.h:184:undefined reference to `ntp_get_time_state'

./include/linux/math64.h:184:undefined reference to `ntp_get_time_state'

[kernel test robot]

tree:   https://github.com/intel-lab-lkp/linux/commits/David-Woodhouse/MAINTAINERS-Add-Miroslav-as-timekeeping-reviewer/20260520-221128
head:   9f455e02d06fb889c99cbc8e086de8a7e0e6ad23
commit: 9f455e02d06fb889c99cbc8e086de8a7e0e6ad23 kernel/time: Add /dev/vmclock_host miscdev
date:   19 hours ago
config: riscv-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260521/202605211131.4itLcRA7-lkp@intel.com/config)
compiler: riscv64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260521/202605211131.4itLcRA7-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/202605211131.4itLcRA7-lkp@intel.com/

All errors (new ones prefixed by >>):

   riscv64-linux-gnu-ld: kernel/time/timekeeping.o: in function `timekeeping_set_reference':
   kernel/time/timekeeping.c:2353:(.text+0xb9a): undefined reference to `ntp_get_status'
   riscv64-linux-gnu-ld: kernel/time/timekeeping.o: in function `mul_u64_u64_shr':
>> ./include/linux/math64.h:184:(.text+0xba6): undefined reference to `ntp_get_time_state'


vim +184 ./include/linux/math64.h

be5e610c0fd6ef Peter Zijlstra 2013-11-18  180  
35181e86df97e4 Haozhong Zhang 2015-10-20  181  #ifndef mul_u64_u64_shr
fc4a0db4149afc Peter Zijlstra 2023-05-19  182  static __always_inline u64 mul_u64_u64_shr(u64 a, u64 mul, unsigned int shift)
35181e86df97e4 Haozhong Zhang 2015-10-20  183  {
35181e86df97e4 Haozhong Zhang 2015-10-20 @184  	return (u64)(((unsigned __int128)a * mul) >> shift);
35181e86df97e4 Haozhong Zhang 2015-10-20  185  }
35181e86df97e4 Haozhong Zhang 2015-10-20  186  #endif /* mul_u64_u64_shr */
35181e86df97e4 Haozhong Zhang 2015-10-20  187  

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