[PATCH v5 02/12] perf tools: Use allocator for perf_cpu_map

From: James Clark
Date: Tue Nov 17 2020 - 09:49:24 EST


Use the existing allocator for perf_cpu_map to avoid use
of raw malloc. This could cause an issue in later commits
where the size of perf_cpu_map is changed.

No functional changes.

Signed-off-by: James Clark <james.clark@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Thomas Richter <tmricht@xxxxxxxxxxxxx>
Cc: John Garry <john.garry@xxxxxxxxxx>
---
tools/perf/util/cpumap.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index dc5c5e6fc502..20e3a75953fc 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -132,15 +132,16 @@ int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res,
int (*f)(struct perf_cpu_map *map, int cpu, void *data),
void *data)
{
- struct perf_cpu_map *c;
int nr = cpus->nr;
+ struct perf_cpu_map *c = perf_cpu_map__empty_new(nr);
int cpu, s1, s2;

- /* allocate as much as possible */
- c = calloc(1, sizeof(*c) + nr * sizeof(int));
if (!c)
return -1;

+ /* Reset size as it may only be partially filled */
+ c->nr = 0;
+
for (cpu = 0; cpu < nr; cpu++) {
s1 = f(cpus, cpu, data);
for (s2 = 0; s2 < c->nr; s2++) {
@@ -155,7 +156,6 @@ int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res,
/* ensure we process id in increasing order */
qsort(c->map, c->nr, sizeof(int), cmp_ids);

- refcount_set(&c->refcnt, 1);
*res = c;
return 0;
}
--
2.28.0