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authorJiri Olsa <jolsa@kernel.org>2016-01-06 11:49:55 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-01-06 20:11:16 -0300
commit15d2b9956b41ffb5961b897bf61cdc09f722dfbf (patch)
treef8f151bf4f42597a632fb44bcc0605dd139caa4d
parentaef90263561a87ae6d9c6a0f4071d825ce636eef (diff)
perf cpumap: Fix cpu conversion in cpu_map__from_entries
We can't convert u16 cpu_map_entries::cpu[x] value directly to int, because it could hold -1, which would be converted as 65535. Adding special treatment for -1, which is not real cpu number, to be converted to (int -1). Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org> Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Kan Liang <kan.liang@intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1452077397-31958-2-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/util/cpumap.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index a0717b93d8f5..fa935093a599 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -188,8 +188,17 @@ static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
if (map) {
unsigned i;
- for (i = 0; i < cpus->nr; i++)
- map->map[i] = (int)cpus->cpu[i];
+ for (i = 0; i < cpus->nr; i++) {
+ /*
+ * Special treatment for -1, which is not real cpu number,
+ * and we need to use (int) -1 to initialize map[i],
+ * otherwise it would become 65535.
+ */
+ if (cpus->cpu[i] == (u16) -1)
+ map->map[i] = -1;
+ else
+ map->map[i] = (int) cpus->cpu[i];
+ }
}
return map;