linux-kernel - [PATCH v3 4/6] perf/util/session: Replace MAX_NR_CPUS with nr_cpus

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Message-Id: <20190819202333.88032-1-meyerk@stormcage.eag.rdlabs.hpecorp.net>
Date:   Mon, 19 Aug 2019 15:23:33 -0500
From:   Kyle Meyer <meyerk@....com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Kyle Meyer <meyerk@....com>, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org,
        Russ Anderson <russ.anderson@....com>,
        Kyle Meyer <kyle.meyer@....com>
Subject: [PATCH v3 4/6] perf/util/session: Replace MAX_NR_CPUS with nr_cpus_online

nr_cpus_online, the number of CPUs online during a record session, can be
used as a dynamic alternative for MAX_NR_CPUS in perf_session__cpu_bitmap.

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: linux-kernel@...r.kernel.org
Cc: Russ Anderson <russ.anderson@....com>
Signed-off-by: Kyle Meyer <kyle.meyer@....com>
---
 tools/perf/util/session.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: tip/tools/perf/util/session.c
===================================================================
--- tip.orig/tools/perf/util/session.c
+++ tip/tools/perf/util/session.c
@@ -2284,6 +2284,7 @@ int perf_session__cpu_bitmap(struct perf
 {
 	int i, err = -1;
 	struct perf_cpu_map *map;
+	int nr_cpus_online = session->header.env.nr_cpus_online;
 
 	for (i = 0; i < PERF_TYPE_MAX; ++i) {
 		struct evsel *evsel;
@@ -2308,9 +2309,8 @@ int perf_session__cpu_bitmap(struct perf
 	for (i = 0; i < map->nr; i++) {
 		int cpu = map->map[i];
 
-		if (cpu >= MAX_NR_CPUS) {
-			pr_err("Requested CPU %d too large. "
-			       "Consider raising MAX_NR_CPUS\n", cpu);
+		if (cpu >= nr_cpus_online) {
+			pr_err("Requested CPU %d too large\n", cpu);
 			goto out_delete_map;
 		}