From: Ian Rogers <irogers@google.com> A typical "cpu" PMU has no "cpus" or "cpumask" file meaning the CPU map is set to NULL, which also encodes an empty CPU map. Update pmu_cpumask so that if the "cpu" PMU fails to load a CPU map, use a default of all online PMUs. Remove const from cpu_map__online for the sake of reference counting. Reviewed-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ali Saidi <alisaidi@amazon.com> Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Cc: Dmitrii Dolgov <9erthalion6@gmail.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jing Zhang <renyu.zj@linux.alibaba.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.g.garry@oracle.com> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Kang Minchul <tegongkang@gmail.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Cc: Ming Wang <wangming01@loongson.cn> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Rob Herring <robh@kernel.org> Cc: Sandipan Das <sandipan.das@amd.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Suzuki Poulouse <suzuki.poulose@arm.com> Cc: Thomas Richter <tmricht@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com> Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20230527072210.2900565-8-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/cpumap.c | 4 ++-- tools/perf/util/cpumap.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c index dc5c5e6fc502..337f0afa5007 100644 --- a/tools/perf/util/cpumap.c +++ b/tools/perf/util/cpumap.c @@ -577,9 +577,9 @@ size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size) return ptr - buf; } -const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */ +struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */ { - static const struct perf_cpu_map *online = NULL; + static struct perf_cpu_map *online = NULL; if (!online) online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */ diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h index 3a442f021468..87e586144628 100644 --- a/tools/perf/util/cpumap.h +++ b/tools/perf/util/cpumap.h @@ -26,7 +26,7 @@ int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **s int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep); int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep); int cpu_map__build_node_map(struct perf_cpu_map *cpus, struct perf_cpu_map **nodep); -const struct perf_cpu_map *cpu_map__online(void); /* thread unsafe */ +struct perf_cpu_map *cpu_map__online(void); /* thread unsafe */ static inline int cpu_map__socket(struct perf_cpu_map *sock, int s) { -- 2.33.0