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-rw-r--r--tools/perf/builtin-report.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 2e317438980..cdae9b2db1c 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -374,16 +374,23 @@ static int __cmd_report(struct perf_report *rep)
(kernel_map->dso->hit &&
(kernel_kmap->ref_reloc_sym == NULL ||
kernel_kmap->ref_reloc_sym->addr == 0))) {
- const struct dso *kdso = kernel_map->dso;
+ const char *desc =
+ "As no suitable kallsyms nor vmlinux was found, kernel samples\n"
+ "can't be resolved.";
+
+ if (kernel_map) {
+ const struct dso *kdso = kernel_map->dso;
+ if (!RB_EMPTY_ROOT(&kdso->symbols[MAP__FUNCTION])) {
+ desc = "If some relocation was applied (e.g. "
+ "kexec) symbols may be misresolved.";
+ }
+ }
ui__warning(
"Kernel address maps (/proc/{kallsyms,modules}) were restricted.\n\n"
"Check /proc/sys/kernel/kptr_restrict before running 'perf record'.\n\n%s\n\n"
"Samples in kernel modules can't be resolved as well.\n\n",
- RB_EMPTY_ROOT(&kdso->symbols[MAP__FUNCTION]) ?
-"As no suitable kallsyms nor vmlinux was found, kernel samples\n"
-"can't be resolved." :
-"If some relocation was applied (e.g. kexec) symbols may be misresolved.");
+ desc);
}
if (dump_trace) {