[tip:x86/hyperv 1/5] arch/x86/hyperv/hv_apic.c:68:10: error: implicit declaration of function 'native_apic_mem_read'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/hyperv
head:   9a2d78e291a7dea0ae4b4a06ce6bbbe4f1ab7c13
commit: 6b48cb5f8347bc0153ff1d7b075db92e6723ffdb [1/5] X86/Hyper-V: Enlighten APIC access
config: x86_64-randconfig-s1-05192043 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout 6b48cb5f8347bc0153ff1d7b075db92e6723ffdb
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   arch/x86/hyperv/hv_apic.c: In function 'hv_apic_read':
>> arch/x86/hyperv/hv_apic.c:68:10: error: implicit declaration of function 'native_apic_mem_read' [-Werror=implicit-function-declaration]
      return native_apic_mem_read(reg);
             ^~~~~~~~~~~~~~~~~~~~
   arch/x86/hyperv/hv_apic.c: In function 'hv_apic_write':
>> arch/x86/hyperv/hv_apic.c:82:3: error: implicit declaration of function 'native_apic_mem_write' [-Werror=implicit-function-declaration]
      native_apic_mem_write(reg, val);
      ^~~~~~~~~~~~~~~~~~~~~
   arch/x86/hyperv/hv_apic.c: In function 'hv_apic_init':
>> arch/x86/hyperv/hv_apic.c:95:3: error: implicit declaration of function 'apic_set_eoi_write' [-Werror=implicit-function-declaration]
      apic_set_eoi_write(hv_apic_eoi_write);
      ^~~~~~~~~~~~~~~~~~
   arch/x86/hyperv/hv_apic.c:96:3: error: 'apic' undeclared (first use in this function)
      apic->read      = hv_apic_read;
      ^~~~
   arch/x86/hyperv/hv_apic.c:96:3: note: each undeclared identifier is reported only once for each function it appears in
   cc1: some warnings being treated as errors

vim +/native_apic_mem_read +68 arch/x86/hyperv/hv_apic.c

    54	
    55	static u32 hv_apic_read(u32 reg)
    56	{
    57		u32 reg_val, hi;
    58	
    59		switch (reg) {
    60		case APIC_EOI:
    61			rdmsr(HV_X64_MSR_EOI, reg_val, hi);
    62			return reg_val;
    63		case APIC_TASKPRI:
    64			rdmsr(HV_X64_MSR_TPR, reg_val, hi);
    65			return reg_val;
    66	
    67		default:
  > 68			return native_apic_mem_read(reg);
    69		}
    70	}
    71	
    72	static void hv_apic_write(u32 reg, u32 val)
    73	{
    74		switch (reg) {
    75		case APIC_EOI:
    76			wrmsr(HV_X64_MSR_EOI, val, 0);
    77			break;
    78		case APIC_TASKPRI:
    79			wrmsr(HV_X64_MSR_TPR, val, 0);
    80			break;
    81		default:
  > 82			native_apic_mem_write(reg, val);
    83		}
    84	}
    85	
    86	static void hv_apic_eoi_write(u32 reg, u32 val)
    87	{
    88		wrmsr(HV_X64_MSR_EOI, val, 0);
    89	}
    90	
    91	void __init hv_apic_init(void)
    92	{
    93		if (ms_hyperv.hints & HV_X64_APIC_ACCESS_RECOMMENDED) {
    94			pr_info("Hyper-V: Using MSR based APIC access\n");
  > 95			apic_set_eoi_write(hv_apic_eoi_write);
    96			apic->read      = hv_apic_read;
    97			apic->write     = hv_apic_write;
    98			apic->icr_write = hv_apic_icr_write;
    99			apic->icr_read  = hv_apic_icr_read;
   100		}
   101	}
   102	

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