[PATCH v3 6/6] perf/util/header: Replace MAX_NR_CPUS with cpu__max_cpu

From: Kyle Meyer <meyerk@hpe.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Kyle Meyer <meyerk@hpe.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	linux-kernel@vger.kernel.org,
	Russ Anderson <russ.anderson@hpe.com>,
	Kyle Meyer <kyle.meyer@hpe.com>
Subject: [PATCH v3 6/6] perf/util/header: Replace MAX_NR_CPUS with cpu__max_cpu
Date: Mon, 19 Aug 2019 15:23:48 -0500	[thread overview]
Message-ID: <20190819202348.88140-1-meyerk@stormcage.eag.rdlabs.hpecorp.net> (raw)

The function cpu__max_cpu returns the possible number of CPUs as defined in the
sysfs and can be used as an alternative for MAX_NR_CPUS in write_cache.
MAX_CACHES is replaced by cpu__max_cpu() * MAX_CACHE_LVL.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: Russ Anderson <russ.anderson@hpe.com>
Signed-off-by: Kyle Meyer <kyle.meyer@hpe.com>
---
 tools/perf/util/header.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index b04c2b6b28b3..16f422bd0acc 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1121,16 +1121,17 @@ static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
 	return 0;
 }
 
-#define MAX_CACHES (MAX_NR_CPUS * 4)
+#define MAX_CACHE_LVL 4
 
 static int write_cache(struct feat_fd *ff,
 		       struct evlist *evlist __maybe_unused)
 {
-	struct cpu_cache_level caches[MAX_CACHES];
+	u32 max_caches = cpu__max_cpu() * MAX_CACHE_LVL;
+	struct cpu_cache_level caches[max_caches];
 	u32 cnt = 0, i, version = 1;
 	int ret;
 
-	ret = build_caches(caches, MAX_CACHES, &cnt);
+	ret = build_caches(caches, max_caches, &cnt);
 	if (ret)
 		goto out;
 
-- 
2.12.3

