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perf tools: Do backtrace post unwind only if we regs and stack were captured

Bail out without error if we want to do backtrace post unwind, but were
not able to capture user registers or user stack during the record
phase, which is possible and valid case.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1347295819-23177-2-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Jiri Olsa 13 năm trước cách đây
mục cha
commit
bdde37163e
1 tập tin đã thay đổi với 5 bổ sung0 xóa
  1. 5 0
      tools/perf/util/session.c

+ 5 - 0
tools/perf/util/session.c

@@ -388,6 +388,11 @@ int machine__resolve_callchain(struct machine *machine,
 	      (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER)))
 		return 0;
 
+	/* Bail out if nothing was captured. */
+	if ((!sample->user_regs.regs) ||
+	    (!sample->user_stack.size))
+		return 0;
+
 	return unwind__get_entries(unwind_entry, &callchain_cursor, machine,
 				   thread, evsel->attr.sample_regs_user,
 				   sample);