[tip: perf/core] libperf: Setup initial evlist::all_cpus value

["tip-bot2 for Jiri Olsa" <tip-bot2@linutronix.de>]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     cb71f7d43ece3d5a4f400f510c61b2ec7c9ce9a1
Gitweb:        https://git.kernel.org/tip/cb71f7d43ece3d5a4f400f510c61b2ec7c9ce9a1
Author:        Jiri Olsa <jolsa@kernel.org>
AuthorDate:    Fri, 10 Jan 2020 16:15:37 +01:00
Committer:     Arnaldo Carvalho de Melo <acme@redhat.com>
CommitterDate: Tue, 14 Jan 2020 12:02:19 -03:00

libperf: Setup initial evlist::all_cpus value

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.

Fixes: 7736627b865d ("perf stat: Use affinity for closing file descriptors")
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200110151537.153012-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 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 ae9e65a..5b9f2ca 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);
 }