perf cpumap: Use perf_cpu_map__for_each_cpu when possible

Rather than manually iterating the CPU map, use
perf_cpu_map__for_each_cpu(). When possible tidy local variables.

Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Ghiti <alexghiti@rivosinc.com>
Cc: Andrew Jones <ajones@ventanamicro.com>
Cc: André Almeida <andrealmeid@igalia.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Atish Patra <atishp@rivosinc.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paran Lee <p4ranlee@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Steinar H. Gunderson <sesse@google.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: Yang Li <yang.lee@linux.alibaba.com>
Cc: Yanteng Si <siyanteng@loongson.cn>
Link: https://lore.kernel.org/r/20240202234057.2085863-9-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

6 files changed, 38 insertions, 39 deletions

diff --git a/tools/perf/util/bpf_kwork.c b/tools/perf/util/bpf_kwork.c
index 6eb2c78fd7f4..44f0f708a15d 100644
--- a/tools/perf/util/bpf_kwork.c
+++ b/tools/perf/util/bpf_kwork.c
@@ -147,12 +147,12 @@ static bool valid_kwork_class_type(enum kwork_class_type type)
 
 static int setup_filters(struct perf_kwork *kwork)
 {
-	u8 val = 1;
-	int i, nr_cpus, key, fd;
-	struct perf_cpu_map *map;
-
 	if (kwork->cpu_list != NULL) {
-		fd = bpf_map__fd(skel->maps.perf_kwork_cpu_filter);
+		int idx, nr_cpus;
+		struct perf_cpu_map *map;
+		struct perf_cpu cpu;
+		int fd = bpf_map__fd(skel->maps.perf_kwork_cpu_filter);
+
 		if (fd < 0) {
 			pr_debug("Invalid cpu filter fd\n");
 			return -1;
@@ -165,8 +165,8 @@ static int setup_filters(struct perf_kwork *kwork)
 		}
 
 		nr_cpus = libbpf_num_possible_cpus();
-		for (i = 0; i < perf_cpu_map__nr(map); i++) {
-			struct perf_cpu cpu = perf_cpu_map__cpu(map, i);
+		perf_cpu_map__for_each_cpu(cpu, idx, map) {
+			u8 val = 1;
 
 			if (cpu.cpu >= nr_cpus) {
 				perf_cpu_map__put(map);
@@ -181,6 +181,8 @@ static int setup_filters(struct perf_kwork *kwork)
 	}
 
 	if (kwork->profile_name != NULL) {
+		int key, fd;
+
 		if (strlen(kwork->profile_name) >= MAX_KWORKNAME) {
 			pr_err("Requested name filter %s too large, limit to %d\n",
 			       kwork->profile_name, MAX_KWORKNAME - 1);
diff --git a/tools/perf/util/bpf_kwork_top.c b/tools/perf/util/bpf_kwork_top.c
index 035e02272790..22a3b00a1e23 100644
--- a/tools/perf/util/bpf_kwork_top.c
+++ b/tools/perf/util/bpf_kwork_top.c
@@ -122,11 +122,11 @@ static bool valid_kwork_class_type(enum kwork_class_type type)
 
 static int setup_filters(struct perf_kwork *kwork)
 {
-	u8 val = 1;
-	int i, nr_cpus, fd;
-	struct perf_cpu_map *map;
-
 	if (kwork->cpu_list) {
+		int idx, nr_cpus, fd;
+		struct perf_cpu_map *map;
+		struct perf_cpu cpu;
+
 		fd = bpf_map__fd(skel->maps.kwork_top_cpu_filter);
 		if (fd < 0) {
 			pr_debug("Invalid cpu filter fd\n");
@@ -140,8 +140,8 @@ static int setup_filters(struct perf_kwork *kwork)
 		}
 
 		nr_cpus = libbpf_num_possible_cpus();
-		for (i = 0; i < perf_cpu_map__nr(map); i++) {
-			struct perf_cpu cpu = perf_cpu_map__cpu(map, i);
+		perf_cpu_map__for_each_cpu(cpu, idx, map) {
+			u8 val = 1;
 
 			if (cpu.cpu >= nr_cpus) {
 				perf_cpu_map__put(map);
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index 356e30c42cd8..6a270d640acb 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -655,10 +655,10 @@ static char hex_char(unsigned char val)
 
 size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
 {
-	int i, cpu;
+	int idx;
 	char *ptr = buf;
 	unsigned char *bitmap;
-	struct perf_cpu last_cpu = perf_cpu_map__cpu(map, perf_cpu_map__nr(map) - 1);
+	struct perf_cpu c, last_cpu = perf_cpu_map__max(map);
 
 	if (buf == NULL)
 		return 0;
@@ -669,12 +669,10 @@ size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
 		return 0;
 	}
 
-	for (i = 0; i < perf_cpu_map__nr(map); i++) {
-		cpu = perf_cpu_map__cpu(map, i).cpu;
-		bitmap[cpu / 8] |= 1 << (cpu % 8);
-	}
+	perf_cpu_map__for_each_cpu(c, idx, map)
+		bitmap[c.cpu / 8] |= 1 << (c.cpu % 8);
 
-	for (cpu = last_cpu.cpu / 4 * 4; cpu >= 0; cpu -= 4) {
+	for (int cpu = last_cpu.cpu / 4 * 4; cpu >= 0; cpu -= 4) {
 		unsigned char bits = bitmap[cpu / 8];
 
 		if (cpu % 8)
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index b4f0f60e60a6..8aa301948de5 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -1699,13 +1699,15 @@ static void python_process_stat(struct perf_stat_config *config,
 {
 	struct perf_thread_map *threads = counter->core.threads;
 	struct perf_cpu_map *cpus = counter->core.cpus;
-	int cpu, thread;
 
-	for (thread = 0; thread < perf_thread_map__nr(threads); thread++) {
-		for (cpu = 0; cpu < perf_cpu_map__nr(cpus); cpu++) {
-			process_stat(counter, perf_cpu_map__cpu(cpus, cpu),
+	for (int thread = 0; thread < perf_thread_map__nr(threads); thread++) {
+		int idx;
+		struct perf_cpu cpu;
+
+		perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
+			process_stat(counter, cpu,
 				     perf_thread_map__pid(threads, thread), tstamp,
-				     perf_counts(counter->counts, cpu, thread));
+				     perf_counts(counter->counts, idx, thread));
 		}
 	}
 }
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 06d0bd7fb459..02a932a83c51 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -2749,6 +2749,7 @@ int perf_session__cpu_bitmap(struct perf_session *session,
 	int i, err = -1;
 	struct perf_cpu_map *map;
 	int nr_cpus = min(session->header.env.nr_cpus_avail, MAX_NR_CPUS);
+	struct perf_cpu cpu;
 
 	for (i = 0; i < PERF_TYPE_MAX; ++i) {
 		struct evsel *evsel;
@@ -2770,9 +2771,7 @@ int perf_session__cpu_bitmap(struct perf_session *session,
 		return -1;
 	}
 
-	for (i = 0; i < perf_cpu_map__nr(map); i++) {
-		struct perf_cpu cpu = perf_cpu_map__cpu(map, i);
-
+	perf_cpu_map__for_each_cpu(cpu, i, map) {
 		if (cpu.cpu >= nr_cpus) {
 			pr_err("Requested CPU %d too large. "
 			       "Consider raising MAX_NR_CPUS\n", cpu.cpu);
diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c
index 1892e9b6aa7f..2b04f47f4db0 100644
--- a/tools/perf/util/svghelper.c
+++ b/tools/perf/util/svghelper.c
@@ -725,26 +725,24 @@ static void scan_core_topology(int *map, struct topology *t, int nr_cpus)
 
 static int str_to_bitmap(char *s, cpumask_t *b, int nr_cpus)
 {
-	int i;
-	int ret = 0;
-	struct perf_cpu_map *m;
-	struct perf_cpu c;
+	int idx, ret = 0;
+	struct perf_cpu_map *map;
+	struct perf_cpu cpu;
 
-	m = perf_cpu_map__new(s);
-	if (!m)
+	map = perf_cpu_map__new(s);
+	if (!map)
 		return -1;
 
-	for (i = 0; i < perf_cpu_map__nr(m); i++) {
-		c = perf_cpu_map__cpu(m, i);
-		if (c.cpu >= nr_cpus) {
+	perf_cpu_map__for_each_cpu(cpu, idx, map) {
+		if (cpu.cpu >= nr_cpus) {
 			ret = -1;
 			break;
 		}
 
-		__set_bit(c.cpu, cpumask_bits(b));
+		__set_bit(cpu.cpu, cpumask_bits(b));
 	}
 
-	perf_cpu_map__put(m);
+	perf_cpu_map__put(map);
 
 	return ret;
 }