Hi Anton, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on kvm/master] [also build test WARNING on mst-vhost/linux-next v5.18-rc3 next-20220420] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/intel-lab-lkp/linux/commits/Anton-Romanov/KVM-x86-Use-current-rather-than-snapshotted-TSC-frequency-if-it-is-constant/20220421-090221 base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git master config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220421/202204211558.rjkmRfSe-lkp@xxxxxxxxx/config) compiler: gcc-11 (Debian 11.2.0-20) 11.2.0 reproduce (this is a W=1 build): # https://github.com/intel-lab-lkp/linux/commit/c60b3070bd6e7e804de118dac10002e4f5f714a6 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Anton-Romanov/KVM-x86-Use-current-rather-than-snapshotted-TSC-frequency-if-it-is-constant/20220421-090221 git checkout c60b3070bd6e7e804de118dac10002e4f5f714a6 # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kvm/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): arch/x86/kvm/x86.c: In function '__get_kvmclock': arch/x86/kvm/x86.c:2936:17: error: expected expression before 'struct' 2936 | struct timespec64 ts; | ^~~~~~ >> arch/x86/kvm/x86.c:2933:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation] 2933 | if (ka->use_master_clock && | ^~ arch/x86/kvm/x86.c:2938:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if' 2938 | if (kvm_get_walltime_and_clockread(&ts, &data->host_tsc)) { | ^~ arch/x86/kvm/x86.c:2938:53: error: 'ts' undeclared (first use in this function); did you mean 'tms'? 2938 | if (kvm_get_walltime_and_clockread(&ts, &data->host_tsc)) { | ^~ | tms arch/x86/kvm/x86.c:2938:53: note: each undeclared identifier is reported only once for each function it appears in arch/x86/kvm/x86.c: At top level: arch/x86/kvm/x86.c:2952:11: error: expected identifier or '(' before 'else' 2952 | } else { | ^~~~ In file included from include/linux/percpu.h:6, from include/linux/context_tracking_state.h:5, from include/linux/hardirq.h:5, from include/linux/kvm_host.h:7, from arch/x86/kvm/x86.c:19: include/linux/preempt.h:219:1: error: expected identifier or '(' before 'do' 219 | do { \ | ^~ include/linux/smp.h:268:33: note: in expansion of macro 'preempt_enable' 268 | #define put_cpu() preempt_enable() | ^~~~~~~~~~~~~~ arch/x86/kvm/x86.c:2956:9: note: in expansion of macro 'put_cpu' 2956 | put_cpu(); | ^~~~~~~ include/linux/preempt.h:223:3: error: expected identifier or '(' before 'while' 223 | } while (0) | ^~~~~ include/linux/smp.h:268:33: note: in expansion of macro 'preempt_enable' 268 | #define put_cpu() preempt_enable() | ^~~~~~~~~~~~~~ arch/x86/kvm/x86.c:2956:9: note: in expansion of macro 'put_cpu' 2956 | put_cpu(); | ^~~~~~~ arch/x86/kvm/x86.c:2957:1: error: expected identifier or '(' before '}' token 2957 | } | ^ vim +/if +2933 arch/x86/kvm/x86.c 2922 2923 /* Called within read_seqcount_begin/retry for kvm->pvclock_sc. */ 2924 static void __get_kvmclock(struct kvm *kvm, struct kvm_clock_data *data) 2925 { 2926 struct kvm_arch *ka = &kvm->arch; 2927 struct pvclock_vcpu_time_info hv_clock; 2928 2929 /* both __this_cpu_read() and rdtsc() should be on the same cpu */ 2930 get_cpu(); 2931 2932 data->flags = 0; > 2933 if (ka->use_master_clock && 2934 (static_cpu_has(X86_FEATURE_CONSTANT_TSC) || __this_cpu_read(cpu_tsc_khz))) 2935 #ifdef CONFIG_X86_64 2936 struct timespec64 ts; 2937 2938 if (kvm_get_walltime_and_clockread(&ts, &data->host_tsc)) { 2939 data->realtime = ts.tv_nsec + NSEC_PER_SEC * ts.tv_sec; 2940 data->flags |= KVM_CLOCK_REALTIME | KVM_CLOCK_HOST_TSC; 2941 } else 2942 #endif 2943 data->host_tsc = rdtsc(); 2944 2945 data->flags |= KVM_CLOCK_TSC_STABLE; 2946 hv_clock.tsc_timestamp = ka->master_cycle_now; 2947 hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset; 2948 kvm_get_time_scale(NSEC_PER_SEC, get_cpu_tsc_khz() * 1000LL, 2949 &hv_clock.tsc_shift, 2950 &hv_clock.tsc_to_system_mul); 2951 data->clock = __pvclock_read_cycles(&hv_clock, data->host_tsc); 2952 } else { 2953 data->clock = get_kvmclock_base_ns() + ka->kvmclock_offset; 2954 } 2955 2956 put_cpu(); 2957 } 2958 -- 0-DAY CI Kernel Test Service https://01.org/lkp
