[PATCH] perf tools: Setup initial evlist::all_cpus value

From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jann Horn <jannh@google.com>, lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Michael Petlan <mpetlan@redhat.com>,
	Andi Kleen <ak@linux.intel.com>
Subject: [PATCH] perf tools: Setup initial evlist::all_cpus value
Date: Fri, 10 Jan 2020 16:15:37 +0100	[thread overview]
Message-ID: <20200110151537.153012-1-jolsa@kernel.org> (raw)

Jann Horn reported crash in perf ftrace because evlist::all_cpus
isn't initialized if there's evlist without events, which is the
case for perf ftrace.

Adding initial initialization of evlist::all_cpus from given cpus,
regardless of events in the evlist.

Reported-by: Jann Horn <jannh@google.com>
Link: https://lkml.kernel.org/n/tip-kzioebqr5c3u4t7tafju8pbx@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/lib/perf/evlist.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index ae9e65aa2491..5b9f2ca50591 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -164,6 +164,9 @@ void perf_evlist__set_maps(struct perf_evlist *evlist,
 		evlist->threads = perf_thread_map__get(threads);
 	}
 
+	if (!evlist->all_cpus && cpus)
+		evlist->all_cpus = perf_cpu_map__get(cpus);
+
 	perf_evlist__propagate_maps(evlist);
 }
 
-- 
2.24.1

