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-rw-r--r--tools/perf/builtin-ftrace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 66d5a6658daf..019312810405 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -173,7 +173,7 @@ static int set_tracing_cpumask(struct cpu_map *cpumap)
int last_cpu;
last_cpu = cpu_map__cpu(cpumap, cpumap->nr - 1);
- mask_size = (last_cpu + 3) / 4 + 1;
+ mask_size = last_cpu / 4 + 2; /* one more byte for EOS */
mask_size += last_cpu / 32; /* ',' is needed for every 32th cpus */
cpumask = malloc(mask_size);