[tip:timers/core 34/34] drivers//clocksource/hyperv_timer.c:264:35: error: 'hv_sched_clock_offset' undeclared; did you mean 'sched_clock_register'?

[kbuild test robot]

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 <lkp@xxxxxxxxx>

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	

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