tree: https://android.googlesource.com/kernel/common android-5.4 head: 2eaad10dbde189a44c86dd88b99aa4b7731ec8f9 commit: 70c62d7976e25bb80906db42c8a093d93a6b6185 [2/11] FROMGIT: x86/percpu: Clean up percpu_to_op() config: i386-randconfig-s002-20210812 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-348-gf0e6938b-dirty git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android-5.4 git checkout 70c62d7976e25bb80906db42c8a093d93a6b6185 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kvm/ 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 >>) arch/x86/kvm/svm.c: note: in included file (through include/linux/bitops.h, include/linux/kernel.h, include/linux/list.h, ...): arch/x86/include/asm/bitops.h:77:37: sparse: sparse: cast truncates bits from constant value (ffffff7f becomes 7f) arch/x86/kvm/svm.c:6776:60: sparse: sparse: dereference of noderef expression arch/x86/kvm/svm.c:6776:60: sparse: sparse: dereference of noderef expression arch/x86/kvm/svm.c:6799:14: sparse: sparse: dereference of noderef expression arch/x86/kvm/svm.c:6805:59: sparse: sparse: dereference of noderef expression arch/x86/kvm/svm.c:6805:59: sparse: sparse: dereference of noderef expression arch/x86/kvm/svm.c:6819:14: sparse: sparse: dereference of noderef expression arch/x86/kvm/svm.c:6844:70: sparse: sparse: dereference of noderef expression arch/x86/kvm/svm.c:6844:70: sparse: sparse: dereference of noderef expression vim +945 arch/x86/kvm/svm.c 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 911 0fe1e009541e92 arch/x86/kvm/svm.c Tejun Heo 2009-10-29 912 struct svm_cpu_data *sd; 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 913 uint64_t efer; 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 914 struct desc_struct *gdt; 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 915 int me = raw_smp_processor_id(); 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 916 10474ae8945ce0 arch/x86/kvm/svm.c Alexander Graf 2009-09-15 917 rdmsrl(MSR_EFER, efer); 10474ae8945ce0 arch/x86/kvm/svm.c Alexander Graf 2009-09-15 918 if (efer & EFER_SVME) 10474ae8945ce0 arch/x86/kvm/svm.c Alexander Graf 2009-09-15 919 return -EBUSY; 10474ae8945ce0 arch/x86/kvm/svm.c Alexander Graf 2009-09-15 920 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 921 if (!has_svm()) { 1f5b77f51a221f arch/x86/kvm/svm.c Borislav Petkov 2012-10-20 922 pr_err("%s: err EOPNOTSUPP on %d\n", __func__, me); 10474ae8945ce0 arch/x86/kvm/svm.c Alexander Graf 2009-09-15 923 return -EINVAL; 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 924 } 0fe1e009541e92 arch/x86/kvm/svm.c Tejun Heo 2009-10-29 925 sd = per_cpu(svm_data, me); 0fe1e009541e92 arch/x86/kvm/svm.c Tejun Heo 2009-10-29 926 if (!sd) { 1f5b77f51a221f arch/x86/kvm/svm.c Borislav Petkov 2012-10-20 927 pr_err("%s: svm_data is NULL on %d\n", __func__, me); 10474ae8945ce0 arch/x86/kvm/svm.c Alexander Graf 2009-09-15 928 return -EINVAL; 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 929 } 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 930 0fe1e009541e92 arch/x86/kvm/svm.c Tejun Heo 2009-10-29 931 sd->asid_generation = 1; 0fe1e009541e92 arch/x86/kvm/svm.c Tejun Heo 2009-10-29 932 sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1; 0fe1e009541e92 arch/x86/kvm/svm.c Tejun Heo 2009-10-29 933 sd->next_asid = sd->max_asid + 1; ed3cd233f80740 arch/x86/kvm/svm.c Brijesh Singh 2017-12-04 934 sd->min_asid = max_sev_asid + 1; 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 935 45fc8757d1d212 arch/x86/kvm/svm.c Thomas Garnier 2017-03-14 936 gdt = get_current_gdt_rw(); 0fe1e009541e92 arch/x86/kvm/svm.c Tejun Heo 2009-10-29 937 sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS); 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 938 9962d032bbff02 arch/x86/kvm/svm.c Alexander Graf 2008-11-25 939 wrmsrl(MSR_EFER, efer | EFER_SVME); 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 940 d0316554d3586c arch/x86/kvm/svm.c Linus Torvalds 2009-12-14 941 wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT); 10474ae8945ce0 arch/x86/kvm/svm.c Alexander Graf 2009-09-15 942 fbc0db76b77125 arch/x86/kvm/svm.c Joerg Roedel 2011-03-25 943 if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) { fbc0db76b77125 arch/x86/kvm/svm.c Joerg Roedel 2011-03-25 944 wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT); 89cbc76768c2fa arch/x86/kvm/svm.c Christoph Lameter 2014-08-17 @945 __this_cpu_write(current_tsc_ratio, TSC_RATIO_DEFAULT); fbc0db76b77125 arch/x86/kvm/svm.c Joerg Roedel 2011-03-25 946 } fbc0db76b77125 arch/x86/kvm/svm.c Joerg Roedel 2011-03-25 947 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 948 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 949 /* 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 950 * Get OSVW bits. 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 951 * 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 952 * Note that it is possible to have a system with mixed processor 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 953 * revisions and therefore different OSVW bits. If bits are not the same 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 954 * on different processors then choose the worst case (i.e. if erratum 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 955 * is present on one processor and not on another then assume that the 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 956 * erratum is present everywhere). 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 957 */ 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 958 if (cpu_has(&boot_cpu_data, X86_FEATURE_OSVW)) { 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 959 uint64_t len, status = 0; 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 960 int err; 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 961 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 962 len = native_read_msr_safe(MSR_AMD64_OSVW_ID_LENGTH, &err); 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 963 if (!err) 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 964 status = native_read_msr_safe(MSR_AMD64_OSVW_STATUS, 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 965 &err); 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 966 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 967 if (err) 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 968 osvw_status = osvw_len = 0; 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 969 else { 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 970 if (len < osvw_len) 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 971 osvw_len = len; 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 972 osvw_status |= status; 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 973 osvw_status &= (1ULL << osvw_len) - 1; 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 974 } 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 975 } else 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 976 osvw_status = osvw_len = 0; 2b036c6b861dc5 arch/x86/kvm/svm.c Boris Ostrovsky 2012-01-09 977 67ec66077799f2 arch/x86/kvm/svm.c Joerg Roedel 2010-05-17 978 svm_init_erratum_383(); 67ec66077799f2 arch/x86/kvm/svm.c Joerg Roedel 2010-05-17 979 1018faa6cf23b2 arch/x86/kvm/svm.c Joerg Roedel 2012-02-29 980 amd_pmu_enable_virt(); 1018faa6cf23b2 arch/x86/kvm/svm.c Joerg Roedel 2012-02-29 981 10474ae8945ce0 arch/x86/kvm/svm.c Alexander Graf 2009-09-15 982 return 0; 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 983 } 6aa8b732ca01c3 drivers/kvm/svm.c Avi Kivity 2006-12-10 984 :::::: The code at line 945 was first introduced by commit :::::: 89cbc76768c2fa4ed95545bf961f3a14ddfeed21 x86: Replace __get_cpu_var uses :::::: TO: Christoph Lameter <cl(a)linux.com&gt; :::::: CC: Tejun Heo <tj(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org