linux-kernel - [PATCH v1 4/5] perf, tools: Add fallback in perf_evsel__nr

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Date:   Thu,  9 Nov 2017 06:55:27 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     acme@...nel.org
Cc:     jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v1 4/5] perf, tools: Add fallback in perf_evsel__nr_cpus for no map

From: Andi Kleen <ak@...ux.intel.com>

Support the case of the event having no cpumap in perf_evsel__nr_cpus.
Just return 1 in this case.  This can happen in perf script
when it uses the perf stat shadow functions.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/util/evsel.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index db658785d828..25f21cde8826 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -157,7 +157,8 @@ static inline struct cpu_map *perf_evsel__cpus(struct perf_evsel *evsel)
 
 static inline int perf_evsel__nr_cpus(struct perf_evsel *evsel)
 {
-	return perf_evsel__cpus(evsel)->nr;
+	struct cpu_map *map = perf_evsel__cpus(evsel);
+	return map ? map->nr : 1;
 }
 
 void perf_counts_values__scale(struct perf_counts_values *count,
-- 
2.13.6