tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.10 head: 9ced6633127bd25a94939777d9ecda54800859fc commit: 2022a67e630a25e8274ad36e0437d8230d8d716d [58/74] KVM: x86/mmu: Set SPTE_AD_WRPROT_ONLY_MASK if and only if PML is enabled config: x86_64-randconfig-s021-20210318 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-277-gc089cd2d-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.10 git checkout 2022a67e630a25e8274ad36e0437d8230d8d716d # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from arch/x86/kvm/mmu/mmu.c:21: arch/x86/kvm/mmu/mmu_internal.h: In function 'kvm_vcpu_ad_need_write_protect': 87 | kvm_x86_ops.cpu_dirty_log_size; | ^ -- In file included from arch/x86/kvm/mmu/spte.c:14: arch/x86/kvm/mmu/mmu_internal.h: In function 'kvm_vcpu_ad_need_write_protect': 87 | kvm_x86_ops.cpu_dirty_log_size; | ^ arch/x86/kvm/mmu/mmu_internal.h:88:1: error: control reaches end of non-void function [-Werror=return-type] 88 | } | ^ cc1: some warnings being treated as errors -- In file included from arch/x86/kvm/mmu/tdp_iter.c:3: arch/x86/kvm/mmu/mmu_internal.h: In function 'kvm_vcpu_ad_need_write_protect': 87 | kvm_x86_ops.cpu_dirty_log_size; | ^ In file included from arch/x86/kvm/mmu/tdp_iter.c:4: arch/x86/kvm/mmu/tdp_iter.h: At top level: arch/x86/kvm/mmu/tdp_iter.h:8:10: fatal error: mmu.h: No such file or directory 8 | #include "mmu.h" | ^~~~~~~ compilation terminated. vim +87 arch/x86/kvm/mmu/mmu_internal.h 75 76 static inline bool kvm_vcpu_ad_need_write_protect(struct kvm_vcpu *vcpu) 77 { 78 /* 79 * When using the EPT page-modification log, the GPAs in the CPU dirty 80 * log would come from L2 rather than L1. Therefore, we need to rely 81 * on write protection to record dirty pages, which bypasses PML, since 82 * writes now result in a vmexit. Note, the check on CPU dirty logging 83 * being enabled is mandatory as the bits used to denote WP-only SPTEs 84 * are reserved for NPT w/ PAE (32-bit KVM). 85 */ 86 return vcpu->arch.mmu == &vcpu->arch.guest_mmu && 88 } 89 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org