drivers/net/ethernet/intel/igc/igc_ptp.c:777:9: error: implicit declaration of function 'convert_art_ns_to_tsc'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   477f70cd2a67904e04c2c2b9bd0fa2e95222f2f6
commit: a90ec84837325df4b9a6798c2cc0df202b5680bd igc: Add support for PTP getcrosststamp()
date:   8 days ago
config: um-allmodconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a90ec84837325df4b9a6798c2cc0df202b5680bd
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout a90ec84837325df4b9a6798c2cc0df202b5680bd
        # save the attached .config to linux build tree
        make W=1 ARCH=um 

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

All errors (new ones prefixed by >>):

   drivers/net/ethernet/intel/igc/igc_ptp.c: In function 'igc_device_tstamp_to_system':
>> drivers/net/ethernet/intel/igc/igc_ptp.c:777:9: error: implicit declaration of function 'convert_art_ns_to_tsc' [-Werror=implicit-function-declaration]
     777 |  return convert_art_ns_to_tsc(tstamp);
         |         ^~~~~~~~~~~~~~~~~~~~~
>> drivers/net/ethernet/intel/igc/igc_ptp.c:777:9: error: incompatible types when returning type 'int' but 'struct system_counterval_t' was expected
     777 |  return convert_art_ns_to_tsc(tstamp);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/ethernet/intel/igc/igc_ptp.c:781:1: error: control reaches end of non-void function [-Werror=return-type]
     781 | }
         | ^
   cc1: some warnings being treated as errors


vim +/convert_art_ns_to_tsc +777 drivers/net/ethernet/intel/igc/igc_ptp.c

   773	
   774	static struct system_counterval_t igc_device_tstamp_to_system(u64 tstamp)
   775	{
   776	#if IS_ENABLED(CONFIG_X86_TSC)
 > 777		return convert_art_ns_to_tsc(tstamp);
   778	#else
   779		return (struct system_counterval_t) { };
   780	#endif
   781	}
   782	

---
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Attachment: .config.gz
Description: application/gzip