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Subject[PATCH 28/59] perf cpumap: Fix cpu conversion in cpu_map__from_entries
Date
From: Jiri Olsa <jolsa@kernel.org>

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>
---
tools/perf/util/cpumap.c | 13 +++++++++++--
1 file 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;
--
2.1.0
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