Re: [PATCH] x86/hyperv: make vapic support x2apic mode

[kbuild test robot]

Hi Roman,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/x86/core]
[cannot apply to v5.4-rc1 next-20190930]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    
https://github.com/0day-ci/linux/commits/Roman-Kagan/x86-hyperv-make-vapic-support-x2apic-mode/20191001-044238
config: x86_64-randconfig-s0-201939 (attached as .config)
compiler: gcc-5 (Ubuntu 5.5.0-12ubuntu1) 5.5.0 20171010
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   arch/x86//hyperv/hv_apic.c: In function 'hv_x2apic_read':
>> arch/x86//hyperv/hv_apic.c:91:10: error: implicit declaration of function 
>> 'native_apic_msr_read' [-Werror=implicit-function-declaration]
      return native_apic_msr_read(reg);
             ^
   arch/x86//hyperv/hv_apic.c: In function 'hv_x2apic_write':
>> arch/x86//hyperv/hv_apic.c:119:3: error: implicit declaration of function 
>> 'native_apic_msr_write' [-Werror=implicit-function-declaration]
      native_apic_msr_write(reg, val);
      ^
   cc1: some warnings being treated as errors

vim +/native_apic_msr_read +91 arch/x86//hyperv/hv_apic.c

    77  
    78  static u32 hv_x2apic_read(u32 reg)
    79  {
    80          u32 reg_val, hi;
    81  
    82          switch (reg) {
    83          case APIC_EOI:
    84                  rdmsr(HV_X64_MSR_EOI, reg_val, hi);
    85                  return reg_val;
    86          case APIC_TASKPRI:
    87                  rdmsr(HV_X64_MSR_TPR, reg_val, hi);
    88                  return reg_val;
    89  
    90          default:
  > 91                  return native_apic_msr_read(reg);
    92          }
    93  }
    94  
    95  static void hv_apic_write(u32 reg, u32 val)
    96  {
    97          switch (reg) {
    98          case APIC_EOI:
    99                  wrmsr(HV_X64_MSR_EOI, val, 0);
   100                  break;
   101          case APIC_TASKPRI:
   102                  wrmsr(HV_X64_MSR_TPR, val, 0);
   103                  break;
   104          default:
   105                  native_apic_mem_write(reg, val);
   106          }
   107  }
   108  
   109  static void hv_x2apic_write(u32 reg, u32 val)
   110  {
   111          switch (reg) {
   112          case APIC_EOI:
   113                  wrmsr(HV_X64_MSR_EOI, val, 0);
   114                  break;
   115          case APIC_TASKPRI:
   116                  wrmsr(HV_X64_MSR_TPR, val, 0);
   117                  break;
   118          default:
 > 119                  native_apic_msr_write(reg, val);
   120          }
   121  }
   122  

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