Re: [PATCH] x86/hyperv: Fix kdump on Azure CVMs

[kernel test robot]

Hi Vitaly,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/x86/core]
[also build test ERROR on linus/master v6.17-rc1]
[cannot apply to next-20250815]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Vitaly-Kuznetsov/x86-hyperv-Fix-kdump-on-Azure-CVMs/20250815-214053
base:   tip/x86/core
patch link:    https://lore.kernel.org/r/20250815133725.1591863-1-vkuznets%40redhat.com
patch subject: [PATCH] x86/hyperv: Fix kdump on Azure CVMs
config: arm64-randconfig-003-20250816 (https://download.01.org/0day-ci/archive/20250816/202508161430.0GC3nT8J-lkp@xxxxxxxxx/config)
compiler: aarch64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250816/202508161430.0GC3nT8J-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202508161430.0GC3nT8J-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   drivers/hv/vmbus_drv.c: In function 'hv_kexec_handler':
>> drivers/hv/vmbus_drv.c:2786:2: error: implicit declaration of function 'hv_ivm_clear_host_access' [-Werror=implicit-function-declaration]
     hv_ivm_clear_host_access();
     ^~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/hv_ivm_clear_host_access +2786 drivers/hv/vmbus_drv.c

  2778	
  2779	static void hv_kexec_handler(void)
  2780	{
  2781		hv_stimer_global_cleanup();
  2782		vmbus_initiate_unload(false);
  2783		/* Make sure conn_state is set as hv_synic_cleanup checks for it */
  2784		mb();
  2785		cpuhp_remove_state(hyperv_cpuhp_online);
> 2786		hv_ivm_clear_host_access();
  2787	};
  2788	

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