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perf cpumap: Add "any" CPU handling to cpu_map__snprint_mask

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If the perf_cpu_map is empty or is just the any CPU value, then early
return. Don't process the "any" CPU when creating the bitmap.

Tested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Ian Rogers 2025-12-03 13:47:02 -08:00 committed by Namhyung Kim
parent a0a4173631
commit e2de90bdc9
1 changed files with 7 additions and 2 deletions
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9
tools/perf/util/cpumap.c
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@ -684,16 +684,21 @@ size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
unsigned char *bitmap;
struct perf_cpu c, last_cpu = perf_cpu_map__max(map);
if (buf == NULL)
if (buf == NULL || size == 0)
return 0;
if (last_cpu.cpu < 0) {
buf[0] = '\0';
return 0;
}
bitmap = zalloc(last_cpu.cpu / 8 + 1);
if (bitmap == NULL) {
buf[0] = '\0';
return 0;
}
perf_cpu_map__for_each_cpu(c, idx, map)
perf_cpu_map__for_each_cpu_skip_any(c, idx, map)
bitmap[c.cpu / 8] |= 1 << (c.cpu % 8);
for (int cpu = last_cpu.cpu / 4 * 4; cpu >= 0; cpu -= 4) {