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| author | Jiri Olsa <jolsa@kernel.org> | 2016-01-06 11:49:55 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-01-06 20:11:16 -0300 |
| commit | 15d2b9956b41ffb5961b897bf61cdc09f722dfbf (patch) | |
| tree | f8f151bf4f42597a632fb44bcc0605dd139caa4d /tools/perf | |
| parent | aef90263561a87ae6d9c6a0f4071d825ce636eef (diff) | |
| download | linux-15d2b9956b41ffb5961b897bf61cdc09f722dfbf.tar.gz | |
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>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/util/cpumap.c | 13 |
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; |