Re: [PATCH v2 7/9] KVM: x86/mmu: Use BUILD_BUG_ON_INVALID() for KVM_MMU_WARN_ON() stub

[kernel test robot <lkp@intel.com>]

Hi Sean,

kernel test robot noticed the following build errors:

[auto build test ERROR on 294ebdda1560d3eb515da88b805ba7f88eb28d21]

url:    https://github.com/intel-lab-lkp/linux/commits/Sean-Christopherson/KVM-x86-mmu-Delete-rmap_printk-and-all-its-usage/20230722-070218
base:   294ebdda1560d3eb515da88b805ba7f88eb28d21
patch link:    https://lore.kernel.org/r/20230721230006.2337941-8-seanjc%40google.com
patch subject: [PATCH v2 7/9] KVM: x86/mmu: Use BUILD_BUG_ON_INVALID() for KVM_MMU_WARN_ON() stub
config: i386-buildonly-randconfig-r006-20230725 (https://download.01.org/0day-ci/archive/20230726/202307260015.1ZsP65rd-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce: (https://download.01.org/0day-ci/archive/20230726/202307260015.1ZsP65rd-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307260015.1ZsP65rd-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/x86/kvm/mmu/mmu.c:1738:19: error: call to undeclared function 'is_empty_shadow_page'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           KVM_MMU_WARN_ON(!is_empty_shadow_page(sp->spt));
                            ^
   1 error generated.


vim +/is_empty_shadow_page +1738 arch/x86/kvm/mmu/mmu.c

43a063cab325ee arch/x86/kvm/mmu/mmu.c Yosry Ahmed         2022-08-23  1735  
876546436db977 arch/x86/kvm/mmu/mmu.c David Matlack       2022-06-22  1736  static void kvm_mmu_free_shadow_page(struct kvm_mmu_page *sp)
260746c03dcb2e drivers/kvm/mmu.c      Avi Kivity          2007-01-05  1737  {
14960b3718bba4 arch/x86/kvm/mmu/mmu.c Sean Christopherson 2023-07-21 @1738  	KVM_MMU_WARN_ON(!is_empty_shadow_page(sp->spt));
7775834a233478 arch/x86/kvm/mmu.c     Xiao Guangrong      2010-06-04  1739  	hlist_del(&sp->hash_link);
bd4c86eaa6ff10 arch/x86/kvm/mmu.c     Xiao Guangrong      2011-07-12  1740  	list_del(&sp->link);
bd4c86eaa6ff10 arch/x86/kvm/mmu.c     Xiao Guangrong      2011-07-12  1741  	free_page((unsigned long)sp->spt);
834be0d83f9451 arch/x86/kvm/mmu.c     Gleb Natapov        2013-01-30  1742  	if (!sp->role.direct)
6a97575d5cffb7 arch/x86/kvm/mmu/mmu.c David Matlack       2022-06-22  1743  		free_page((unsigned long)sp->shadowed_translation);
e8ad9a707496c1 arch/x86/kvm/mmu.c     Xiao Guangrong      2010-05-13  1744  	kmem_cache_free(mmu_page_header_cache, sp);
260746c03dcb2e drivers/kvm/mmu.c      Avi Kivity          2007-01-05  1745  }
260746c03dcb2e drivers/kvm/mmu.c      Avi Kivity          2007-01-05  1746  

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