diff options
| -rw-r--r-- | tools/perf/util/probe-event.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index a78c8d59a555..3a7649835ec9 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -108,7 +108,6 @@ void exit_probe_symbol_maps(void) static struct ref_reloc_sym *kernel_get_ref_reloc_sym(struct map **pmap) { - /* kmap->ref_reloc_sym should be set if host_machine is initialized */ struct kmap *kmap; struct map *map = machine__kernel_map(host_machine); @@ -819,7 +818,10 @@ post_process_kernel_probe_trace_events(struct probe_trace_event *tevs, reloc_sym = kernel_get_ref_reloc_sym(&map); if (!reloc_sym) { - pr_warning("Relocated base symbol is not found!\n"); + pr_warning("Relocated base symbol is not found! " + "Check /proc/sys/kernel/kptr_restrict\n" + "and /proc/sys/kernel/perf_event_paranoid. " + "Or run as privileged perf user.\n\n"); return -EINVAL; } @@ -3025,7 +3027,10 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev, (!pp->retprobe || kretprobe_offset_is_supported())) { reloc_sym = kernel_get_ref_reloc_sym(NULL); if (!reloc_sym) { - pr_warning("Relocated base symbol is not found!\n"); + pr_warning("Relocated base symbol is not found! " + "Check /proc/sys/kernel/kptr_restrict\n" + "and /proc/sys/kernel/perf_event_paranoid. " + "Or run as privileged perf user.\n\n"); ret = -EINVAL; goto out; } |