Hi Vitaly,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/auto-latest]
[also build test WARNING on v4.15-rc8 next-20180118]
[cannot apply to tip/x86/core kvm/linux-next]
[if your patch is applied to the wrong git tree, please drop us a note to help 
improve the system]

url:    
https://github.com/0day-ci/linux/commits/Vitaly-Kuznetsov/x86-kvm-hyperv-stable-clocksorce-for-L2-guests-when-running-nested-KVM-on-Hyper-V/20180119-160814
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

   arch/x86/kvm/x86.c:2120:38: sparse: incorrect type in argument 1 (different 
address spaces) @@ expected void const @@ got d const @@
   arch/x86/kvm/x86.c:2120:38: expected void const
   arch/x86/kvm/x86.c:2120:38: got unsigned char COPYING CREDITS Documentation 
Kbuild Kconfig MAINTAINERS Makefile README arch block certs crypto drivers 
firmware fs include init ipc kernel lib mm net samples scripts security sound 
tools usr virt
>> arch/x86/kvm/x86.c:5936:6: sparse: symbol 'kvm_hyperv_tsc_notifier' was not 
>> declared. Should it be
   arch/x86/kvm/x86.c:7585:5: sparse: symbol 'kvm_valid_sregs' was not 
declared. Should it be
   arch/x86/kvm/x86.c:8401:16: sparse: incompatible types in comparison 
expression (different address spaces)
   arch/x86/include/asm/paravirt.h:782:9: sparse: context imbalance in 
'vcpu_enter_guest' - unexpected unlock

Please review and possibly fold the followup patch.

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