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-rw-r--r--tools/perf/util/event.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 6635fcd..0fe9adf 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -553,9 +553,18 @@ static int perf_event__process_kernel_mmap(union perf_event *event,
goto out_problem;
perf_event__set_kernel_mmap_len(event, machine->vmlinux_maps);
- perf_session__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
- symbol_name,
- event->mmap.pgoff);
+
+ /*
+ * Avoid using a zero address (kptr_restrict) for the ref reloc
+ * symbol. Effectively having zero here means that at record
+ * time /proc/sys/kernel/kptr_restrict was non zero.
+ */
+ if (event->mmap.pgoff != 0) {
+ perf_session__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
+ symbol_name,
+ event->mmap.pgoff);
+ }
+
if (machine__is_default_guest(machine)) {
/*
* preload dso of guest kernel and modules
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