[PATCH v3 4/4] x86/snp: Convert shared memory back to private on kexec

[kernel test robot]

Hi Ashish,

kernel test robot noticed the following build errors:

[auto build test ERROR on efi/next]
[also build test ERROR on linus/master v6.9-rc2 next-20240405]
[cannot apply to tip/x86/core tip/master tip/x86/mm tip/auto-latest]
[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/Ashish-Kalra/efi-x86-skip-efi_arch_mem_reserve-in-case-of-kexec/20240405-071346
base:   https://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git next
patch link:    https://lore.kernel.org/r/41db1ebbe58fb082dbe848f1c666ed23e83f1752.1712270976.git.ashish.kalra%40amd.com
patch subject: [PATCH v3 4/4] x86/snp: Convert shared memory back to private on kexec
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20240405/202404051912.7Boy0XDE-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240405/202404051912.7Boy0XDE-lkp@intel.com/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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404051912.7Boy0XDE-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   ld: arch/x86/kernel/head64.o: in function `snp_kexec_unshare_mem':
>> head64.c:(.text+0x110): multiple definition of `snp_kexec_unshare_mem'; arch/x86/realmode/init.o:init.c:(.text+0x10): first defined here
   ld: arch/x86/kernel/nmi.o: in function `snp_kexec_unshare_mem':
   nmi.c:(.text+0x820): multiple definition of `snp_kexec_unshare_mem'; arch/x86/realmode/init.o:init.c:(.text+0x10): first defined here
   ld: arch/x86/kernel/probe_roms.o: in function `snp_kexec_unshare_mem':
   probe_roms.c:(.text+0x370): multiple definition of `snp_kexec_unshare_mem'; arch/x86/realmode/init.o:init.c:(.text+0x10): first defined here
   ld: arch/x86/kernel/cpu/common.o: in function `snp_kexec_unshare_mem':
   common.c:(.text+0x530): multiple definition of `snp_kexec_unshare_mem'; arch/x86/realmode/init.o:init.c:(.text+0x10): first defined here
   ld: arch/x86/kernel/cpu/amd.o: in function `snp_kexec_unshare_mem':
   amd.c:(.text+0x12b0): multiple definition of `snp_kexec_unshare_mem'; arch/x86/realmode/init.o:init.c:(.text+0x10): first defined here
   ld: arch/x86/kernel/smpboot.o: in function `snp_kexec_unshare_mem':
   smpboot.c:(.text+0xfa0): multiple definition of `snp_kexec_unshare_mem'; arch/x86/realmode/init.o:init.c:(.text+0x10): first defined here
   ld: arch/x86/kernel/crash.o: in function `snp_kexec_unshare_mem':
   crash.c:(.text+0xa0): multiple definition of `snp_kexec_unshare_mem'; arch/x86/realmode/init.o:init.c:(.text+0x10): first defined here
   ld: arch/x86/mm/fault.o: in function `snp_kexec_unshare_mem':
   fault.c:(.text+0x1ce0): multiple definition of `snp_kexec_unshare_mem'; arch/x86/realmode/init.o:init.c:(.text+0x10): first defined here
   ld: arch/x86/mm/extable.o: in function `snp_kexec_unshare_mem':
   extable.c:(.text+0x330): multiple definition of `snp_kexec_unshare_mem'; arch/x86/realmode/init.o:init.c:(.text+0x10): first defined here
   ld: arch/x86/platform/efi/efi_64.o: in function `snp_kexec_unshare_mem':
   efi_64.c:(.text+0x160): multiple definition of `snp_kexec_unshare_mem'; arch/x86/realmode/init.o:init.c:(.text+0x10): first defined here
   ld: drivers/iommu/amd/init.o: in function `snp_kexec_unshare_mem':
   init.c:(.text+0x15e0): multiple definition of `snp_kexec_unshare_mem'; arch/x86/realmode/init.o:init.c:(.text+0x10): first defined here
--
   In file included from arch/x86/realmode/init.c:12:
>> arch/x86/include/asm/sev.h:265:6: warning: no previous prototype for 'snp_kexec_unshare_mem' [-Wmissing-prototypes]
     265 | void snp_kexec_unshare_mem(void) {}
         |      ^~~~~~~~~~~~~~~~~~~~~
>> arch/x86/include/asm/sev.h:266:13: warning: 'snp_kexec_stop_conversion' defined but not used [-Wunused-function]
     266 | static void snp_kexec_stop_conversion(bool crash) {}
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~

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