tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/tip/tip.git 
timers/core
head:   b74e1d61dbc614ff35ef3ad9267c61ed06b09051
commit: b74e1d61dbc614ff35ef3ad9267c61ed06b09051 [34/34] clocksource/hyperv: 
Add Hyper-V specific sched clock function
config: i386-randconfig-g002-201933 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-10) 7.4.0
reproduce:
        git checkout b74e1d61dbc614ff35ef3ad9267c61ed06b09051
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <l...@intel.com>

All error/warnings (new ones prefixed by >>):

   drivers//clocksource/hyperv_timer.c: In function 'read_hv_sched_clock_msr':
>> drivers//clocksource/hyperv_timer.c:264:35: error: 'hv_sched_clock_offset' 
>> undeclared (first use in this function); did you mean 'sched_clock_register'?
     return read_hv_clock_msr(NULL) - hv_sched_clock_offset;
                                      ^~~~~~~~~~~~~~~~~~~~~
                                      sched_clock_register
   drivers//clocksource/hyperv_timer.c:264:35: note: each undeclared identifier 
is reported only once for each function it appears in
   drivers//clocksource/hyperv_timer.c: In function 'hv_init_clocksource':
   drivers//clocksource/hyperv_timer.c:334:2: error: 'hv_sched_clock_offset' 
undeclared (first use in this function); did you mean 'sched_clock_register'?
     hv_sched_clock_offset = hyperv_cs->read(hyperv_cs);
     ^~~~~~~~~~~~~~~~~~~~~
     sched_clock_register
   drivers//clocksource/hyperv_timer.c: In function 'read_hv_sched_clock_msr':
>> drivers//clocksource/hyperv_timer.c:265:1: warning: control reaches end of 
>> non-void function [-Wreturn-type]
    }
    ^

vim +264 drivers//clocksource/hyperv_timer.c

   261  
   262  static u64 read_hv_sched_clock_msr(void)
   263  {
 > 264          return read_hv_clock_msr(NULL) - hv_sched_clock_offset;
 > 265  }
   266  

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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