linux-kernel - [intel-tdx:kvm-upstream-workaround 422/422] arch/x86/kvm/mmu/mmu.c:4546:6: error: call to undeclared function 'get_user_page_fast'; ISO C99 and later do not support implicit function declarations

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Date:   Wed, 1 Jun 2022 12:42:53 +0800
From:   kernel test robot <lkp@...el.com>
To:     Xiaoyao Li <xiaoyao.li@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Isaku Yamahata <isaku.yamahata@...el.com>
Subject: [intel-tdx:kvm-upstream-workaround 422/422]
 arch/x86/kvm/mmu/mmu.c:4546:6: error: call to undeclared function
 'get_user_page_fast'; ISO C99 and later do not support implicit function
 declarations

tree:   https://github.com/intel/tdx.git kvm-upstream-workaround
head:   4e487b52e144ed36e4ae202e7103e63679710095
commit: 4e487b52e144ed36e4ae202e7103e63679710095 [422/422] KVM: x86/mmu: Use get_user_page_fast instead of get_user_page_fast_only
config: i386-randconfig-a002 (https://download.01.org/0day-ci/archive/20220601/202206011249.nbPtIS94-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c825abd6b0198fb088d9752f556a70705bc99dfd)
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/4e487b52e144ed36e4ae202e7103e63679710095
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx kvm-upstream-workaround
        git checkout 4e487b52e144ed36e4ae202e7103e63679710095
        # 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 SHELL=/bin/bash arch/x86/kvm/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from arch/x86/kvm/mmu/mmu.c:18:
   In file included from arch/x86/kvm/irq.h:15:
   In file included from include/linux/kvm_host.h:47:
   include/linux/memfile_notifier.h:87:57: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
   static int memfile_register_notifier(struct file *file, flags,
                                                           ^
                                                           int
>> arch/x86/kvm/mmu/mmu.c:4546:6: error: call to undeclared function 'get_user_page_fast'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           if (get_user_page_fast(hva, FOLL_WRITE, page))
               ^
   arch/x86/kvm/mmu/mmu.c:4546:6: note: did you mean 'get_user_pages_fast'?
   include/linux/mm.h:1931:5: note: 'get_user_pages_fast' declared here
   int get_user_pages_fast(unsigned long start, int nr_pages,
       ^
   2 errors generated.


vim +/get_user_page_fast +4546 arch/x86/kvm/mmu/mmu.c

  4527	
  4528	/*
  4529	 * Private page can't be release on mmu_notifier without losing page contents.
  4530	 * The help, callback, from backing store is needed to allow page migration.
  4531	 * For now, pin the page.
  4532	 */
  4533	static int kvm_faultin_pfn_private_mapped(struct kvm_vcpu *vcpu,
  4534					    struct kvm_page_fault *fault)
  4535	{
  4536		hva_t hva = gfn_to_hva_memslot(fault->slot, fault->gfn);
  4537		struct page *page[1];
  4538	
  4539		fault->map_writable = false;
  4540		fault->pfn = KVM_PFN_ERR_FAULT;
  4541		if (hva == KVM_HVA_ERR_RO_BAD || hva == KVM_HVA_ERR_BAD)
  4542			return RET_PF_INVALID;
  4543	
  4544		/* TDX allows only RWX.  Read-only isn't supported. */
  4545		WARN_ON_ONCE(!fault->write);
> 4546		if (get_user_page_fast(hva, FOLL_WRITE, page))
  4547			return RET_PF_INVALID;
  4548	
  4549		fault->map_writable = true;
  4550		fault->pfn = page_to_pfn(page[0]);
  4551		return RET_PF_CONTINUE;
  4552	}
  4553	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp