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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>
This commit is contained in:
Jiri Olsa 2016-01-06 11:49:55 +01:00 committed by Arnaldo Carvalho de Melo
parent aef9026356
commit 15d2b9956b
1 changed files with 11 additions and 2 deletions
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13
tools/perf/util/cpumap.c
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@ -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;