[intel-tdx:kvm-upstream-workaround 312/335] arch/x86/kvm/mmu/mmu.c:713:5: warning: no previous prototype for function 'kvm_mmu_topup_memory_cache_for_split'

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

tree:   https://github.com/intel/tdx.git kvm-upstream-workaround
head:   9b1b005c63f21cbc8dc4f1691b05964c90240385
commit: 775207f6d101d7d963d98bf833323efcec435c4d [312/335] [REVERTME] KVM: TDX, x86/tdp_mmu: Protect Secure-EPT page
config: i386-randconfig-a011 (https://download.01.org/0day-ci/archive/20230407/202304070804.xlAhNFOq-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel/tdx/commit/775207f6d101d7d963d98bf833323efcec435c4d
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx kvm-upstream-workaround
        git checkout 775207f6d101d7d963d98bf833323efcec435c4d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kvm/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304070804.xlAhNFOq-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/x86/kvm/mmu/mmu.c:19:
   In file included from arch/x86/kvm/irq.h:15:
   In file included from include/linux/kvm_host.h:42:
   In file included from include/linux/kvm_para.h:5:
   In file included from include/uapi/linux/kvm_para.h:37:
   In file included from arch/x86/include/asm/kvm_para.h:10:
   arch/x86/include/asm/tdx.h:188:49: warning: shift count >= width of type [-Wshift-count-overflow]
                                struct tdx_module_output *out) { return TDX_SEAMCALL_UD; };
                                                                        ^~~~~~~~~~~~~~~
   arch/x86/include/asm/tdx.h:26:28: note: expanded from macro 'TDX_SEAMCALL_UD'
   #define TDX_SEAMCALL_UD                 (TDX_SW_ERROR | X86_TRAP_UD)
                                            ^~~~~~~~~~~~
   arch/x86/include/asm/tdx.h:21:25: note: expanded from macro 'TDX_SW_ERROR'
   #define TDX_SW_ERROR                    (TDX_ERROR | GENMASK_ULL(47, 40))
                                            ^~~~~~~~~
   arch/x86/include/asm/tdx.h:20:21: note: expanded from macro 'TDX_ERROR'
   #define TDX_ERROR                       _BITUL(TDX_ERROR_BIT)
                                           ^~~~~~~~~~~~~~~~~~~~~
   include/uapi/linux/const.h:28:27: note: expanded from macro '_BITUL'
   #define _BITUL(x)       (_UL(1) << (x))
                                   ^  ~~~
>> arch/x86/kvm/mmu/mmu.c:713:5: warning: no previous prototype for function 'kvm_mmu_topup_memory_cache_for_split' [-Wmissing-prototypes]
   int kvm_mmu_topup_memory_cache_for_split(struct kvm *kvm)
       ^
   arch/x86/kvm/mmu/mmu.c:713:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int kvm_mmu_topup_memory_cache_for_split(struct kvm *kvm)
   ^
   static 
   2 warnings generated.


vim +/kvm_mmu_topup_memory_cache_for_split +713 arch/x86/kvm/mmu/mmu.c

   712	
 > 713	int kvm_mmu_topup_memory_cache_for_split(struct kvm *kvm)
   714	{
   715		int r = 0;
   716	#ifdef CONFIG_INTEL_TDX_HOST_DEBUG_MEMORY_CORRUPT
   717		struct kvm_mmu_memory_cache *mc;
   718		int start, end, i;
   719	
   720		mutex_lock(&kvm->arch.private_spt_for_split_lock);
   721		mc = &kvm->arch.private_spt_for_split_cache;
   722		start = kvm_mmu_memory_cache_nr_free_objects(mc);
   723		r = kvm_mmu_topup_memory_cache(mc, KVM_MAX_HUGEPAGE_LEVEL *
   724					       kvm->created_vcpus);
   725		end = kvm_mmu_memory_cache_nr_free_objects(mc);
   726		for (i = start; i < end; i++)
   727			kvm_mmu_split_direct_map(virt_to_page(mc->objects[i]));
   728		mutex_unlock(&kvm->arch.private_spt_for_split_lock);
   729	#endif
   730		return r;
   731	}
   732	

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