tree: https://github.com/rhvgoyal/linux asyncpf-error-v1 head: 94f54bb2e6f969aa7ceb778bb15ac986f3c9cecf commit: 94f54bb2e6f969aa7ceb778bb15ac986f3c9cecf [7/7] kvm, async_pf: Use FOLL_WRITE only for write faults config: s390-randconfig-s032-20200622 (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-dirty git checkout 94f54bb2e6f969aa7ceb778bb15ac986f3c9cecf # save the attached .config to linux build tree make W=1 C=1 ARCH=s390 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +3982 arch/s390/kvm/kvm-s390.c 3c038e6be0e299d Dominik Dingel 2013-10-07 3956 3c038e6be0e299d Dominik Dingel 2013-10-07 3957 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu) 3c038e6be0e299d Dominik Dingel 2013-10-07 3958 { 3c038e6be0e299d Dominik Dingel 2013-10-07 3959 hva_t hva; 3c038e6be0e299d Dominik Dingel 2013-10-07 3960 struct kvm_arch_async_pf arch; 3c038e6be0e299d Dominik Dingel 2013-10-07 3961 int rc; 3c038e6be0e299d Dominik Dingel 2013-10-07 3962 3c038e6be0e299d Dominik Dingel 2013-10-07 3963 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 3c038e6be0e299d Dominik Dingel 2013-10-07 3964 return 0; 3c038e6be0e299d Dominik Dingel 2013-10-07 3965 if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) != 3c038e6be0e299d Dominik Dingel 2013-10-07 3966 vcpu->arch.pfault_compare) 3c038e6be0e299d Dominik Dingel 2013-10-07 3967 return 0; 3c038e6be0e299d Dominik Dingel 2013-10-07 3968 if (psw_extint_disabled(vcpu)) 3c038e6be0e299d Dominik Dingel 2013-10-07 3969 return 0; 9a022067ad75b11 David Hildenbrand 2014-08-05 3970 if (kvm_s390_vcpu_has_irq(vcpu, 0)) 3c038e6be0e299d Dominik Dingel 2013-10-07 3971 return 0; b9224cd7381aea7 David Hildenbrand 2018-04-30 3972 if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK)) 3c038e6be0e299d Dominik Dingel 2013-10-07 3973 return 0; 3c038e6be0e299d Dominik Dingel 2013-10-07 3974 if (!vcpu->arch.gmap->pfault_enabled) 3c038e6be0e299d Dominik Dingel 2013-10-07 3975 return 0; 3c038e6be0e299d Dominik Dingel 2013-10-07 3976 81480cc19c56efb Heiko Carstens 2014-01-01 3977 hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr)); 81480cc19c56efb Heiko Carstens 2014-01-01 3978 hva += current->thread.gmap_addr & ~PAGE_MASK; 81480cc19c56efb Heiko Carstens 2014-01-01 3979 if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8)) 3c038e6be0e299d Dominik Dingel 2013-10-07 3980 return 0; 3c038e6be0e299d Dominik Dingel 2013-10-07 3981 3c038e6be0e299d Dominik Dingel 2013-10-07 @3982 rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch); 3c038e6be0e299d Dominik Dingel 2013-10-07 3983 return rc; 3c038e6be0e299d Dominik Dingel 2013-10-07 3984 } 3c038e6be0e299d Dominik Dingel 2013-10-07 3985 :::::: The code at line 3982 was first introduced by commit :::::: 3c038e6be0e299d4d3762d0a9a29f02de6e04991 KVM: async_pf: Async page fault support on s390 :::::: TO: Dominik Dingel <dingel(a)linux.vnet.ibm.com&gt; :::::: CC: Christian Borntraeger <borntraeger(a)de.ibm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org