tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: e0a00cd6ae6571f9fc6f9f42313f70879df89904 commit: d11dbe8b4e8ad4c5bd90147912352ef6f13a2bb6 [9781/30000] trace: Add osnoise tracer config: x86_64-randconfig-102-20240227 (https://download.01.org/0day-ci/archive/20240229/202402290415.QIyguW8r-lkp@i...) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240229/202402290415.QIyguW8r-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202402290415.QIyguW8r-lkp@intel.com/ All errors (new ones prefixed by >>): ld: warning: arch/x86/lib/retpoline.o: missing .note.GNU-stack section implies executable stack ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker ld: warning: arch/x86/lib/retpoline.o: missing .note.GNU-stack section implies executable stack ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker ld: warning: .tmp_vmlinux.kallsyms1 has a LOAD segment with RWX permissions ld: kernel/trace/trace_osnoise.o: in function `run_osnoise':

...

kernel/trace/trace_osnoise.c:933: undefined reference to `latency_fsnotify'

vim +933 kernel/trace/trace_osnoise.c 784 785 /* 786 * run_osnoise - Sample the time and look for osnoise 787 * 788 * Used to capture the time, looking for potential osnoise latency repeatedly. 789 * Different from hwlat_detector, it is called with preemption and interrupts 790 * enabled. This allows irqs, softirqs and threads to run, interfering on the 791 * osnoise sampling thread, as they would do with a regular thread. 792 */ 793 static int run_osnoise(void) 794 { 795 struct osnoise_variables *osn_var = this_cpu_osn_var(); 796 u64 noise = 0, sum_noise = 0, max_noise = 0; 797 struct trace_array *tr = osnoise_trace; 798 u64 start, sample, last_sample; 799 u64 last_int_count, int_count; 800 s64 total, last_total = 0; 801 struct osnoise_sample s; 802 unsigned int threshold; 803 int hw_count = 0; 804 u64 runtime, stop_in; 805 int ret = -1; 806 807 /* 808 * Considers the current thread as the workload. 809 */ 810 osn_var->pid = current->pid; 811 812 /* 813 * Save the current stats for the diff 814 */ 815 save_osn_sample_stats(osn_var, &s); 816 817 /* 818 * if threshold is 0, use the default value of 5 us. 819 */ 820 threshold = tracing_thresh ? : 5000; 821 822 /* 823 * Make sure NMIs see sampling first 824 */ 825 osn_var->sampling = true; 826 barrier(); 827 828 /* 829 * Transform the *_us config to nanoseconds to avoid the 830 * division on the main loop. 831 */ 832 runtime = osnoise_data.sample_runtime * NSEC_PER_USEC; 833 stop_in = osnoise_data.stop_tracing * NSEC_PER_USEC; 834 835 /* 836 * Start timestemp 837 */ 838 start = time_get(); 839 840 /* 841 * "previous" loop. 842 */ 843 last_int_count = set_int_safe_time(osn_var, &last_sample); 844 845 do { 846 /* 847 * Get sample! 848 */ 849 int_count = set_int_safe_time(osn_var, &sample); 850 851 noise = time_sub(sample, last_sample); 852 853 /* 854 * This shouldn't happen. 855 */ 856 if (noise < 0) { 857 osnoise_taint("negative noise!"); 858 goto out; 859 } 860 861 /* 862 * Sample runtime. 863 */ 864 total = time_sub(sample, start); 865 866 /* 867 * Check for possible overflows. 868 */ 869 if (total < last_total) { 870 osnoise_taint("total overflow!"); 871 break; 872 } 873 874 last_total = total; 875 876 if (noise >= threshold) { 877 int interference = int_count - last_int_count; 878 879 if (noise > max_noise) 880 max_noise = noise; 881 882 if (!interference) 883 hw_count++; 884 885 sum_noise += noise; 886 887 trace_sample_threshold(last_sample, noise, interference); 888 889 if (osnoise_data.stop_tracing) 890 if (noise > stop_in) 891 osnoise_stop_tracing(); 892 } 893 894 /* 895 * For the non-preemptive kernel config: let threads runs, if 896 * they so wish. 897 */ 898 cond_resched(); 899 900 last_sample = sample; 901 last_int_count = int_count; 902 903 } while (total < runtime && !kthread_should_stop()); 904 905 /* 906 * Finish the above in the view for interrupts. 907 */ 908 barrier(); 909 910 osn_var->sampling = false; 911 912 /* 913 * Make sure sampling data is no longer updated. 914 */ 915 barrier(); 916 917 /* 918 * Save noise info. 919 */ 920 s.noise = time_to_us(sum_noise); 921 s.runtime = time_to_us(total); 922 s.max_sample = time_to_us(max_noise); 923 s.hw_count = hw_count; 924 925 /* Save interference stats info */ 926 diff_osn_sample_stats(osn_var, &s); 927 928 trace_osnoise_sample(&s); 929 930 /* Keep a running maximum ever recorded osnoise "latency" */ 931 if (max_noise > tr->max_latency) { 932 tr->max_latency = max_noise;

933 latency_fsnotify(tr); 934 } 935 936 if (osnoise_data.stop_tracing_total) 937 if (s.noise > osnoise_data.stop_tracing_total) 938 osnoise_stop_tracing(); 939 940 return 0; 941 out: 942 return ret; 943 } 944

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