[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 warnings:

[auto build test WARNING on efi/next]
[also build test WARNING 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-rhel-8.3-rust (https://download.01.org/0day-ci/archive/20240405/202404051917.mk4DoDkI-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240405/202404051917.mk4DoDkI-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/202404051917.mk4DoDkI-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/x86/kernel/sev.c:1006:14: error: call to undeclared function 'pte_decrypted'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1006 |                 if (pte && pte_decrypted(*pte) && !pte_none(*pte)) {
         |                            ^
   arch/x86/kernel/sev.c:1035:16: error: call to undeclared function 'pte_decrypted'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1035 |                 if (!pte || !pte_decrypted(*pte) || pte_none(*pte))
         |                              ^
>> arch/x86/kernel/sev.c:1025:16: warning: variable 'size' set but not used [-Wunused-but-set-variable]
    1025 |         unsigned long size;
         |                       ^
   arch/x86/kernel/sev.c:1056:7: error: call to undeclared function 'stop_memory_enc_conversion'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1056 |         if (!stop_memory_enc_conversion(wait_for_lock))
         |              ^
   1 warning and 3 errors generated.


vim +/size +1025 arch/x86/kernel/sev.c

  1021	
  1022	static void unshare_all_bss_decrypted_memory(void)
  1023	{
  1024		unsigned long vaddr, vaddr_end;
> 1025		unsigned long size;
  1026		unsigned int level;
  1027		unsigned int npages;
  1028		pte_t *pte;
  1029	
  1030		vaddr = (unsigned long)__start_bss_decrypted;
  1031		vaddr_end = (unsigned long)__start_bss_decrypted_unused;
  1032		npages = (vaddr_end - vaddr) >> PAGE_SHIFT;
  1033		for (; vaddr < vaddr_end; vaddr += PAGE_SIZE) {
  1034			pte = lookup_address(vaddr, &level);
  1035			if (!pte || !pte_decrypted(*pte) || pte_none(*pte))
  1036				continue;
  1037	
  1038			size = page_level_size(level);
  1039			set_pte_enc(pte, level, (void *)vaddr);
  1040		}
  1041		vaddr = (unsigned long)__start_bss_decrypted;
  1042		snp_set_memory_private(vaddr, npages);
  1043	}
  1044	

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