linux-kernel - [PATCH v3 1/2] perf bench numa: fix cpumask memory leak in node_has

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Message-ID: <20200813113041.GA1685@oc3871087118.ibm.com>
Date:   Thu, 13 Aug 2020 13:30:42 +0200
From:   Alexander Gordeev <agordeev@...ux.ibm.com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Balamuruhan S <bala24@...ux.vnet.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH v3 1/2] perf bench numa: fix cpumask memory leak in
 node_has_cpus()

Couple numa_allocate_cpumask() and numa_free_cpumask() functions

Signed-off-by: Alexander Gordeev <agordeev@...ux.ibm.com>
---
 tools/perf/bench/numa.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/tools/perf/bench/numa.c b/tools/perf/bench/numa.c
index 31e2601..9066511 100644
--- a/tools/perf/bench/numa.c
+++ b/tools/perf/bench/numa.c
@@ -248,16 +248,21 @@ static int is_node_present(int node)
 static bool node_has_cpus(int node)
 {
 	struct bitmask *cpu = numa_allocate_cpumask();
+	bool ret = false; /* fall back to nocpus */
 	unsigned int i;
 
-	if (cpu && !numa_node_to_cpus(node, cpu)) {
+	BUG_ON(!cpu);
+	if (!numa_node_to_cpus(node, cpu)) {
 		for (i = 0; i < cpu->size; i++) {
-			if (numa_bitmask_isbitset(cpu, i))
-				return true;
+			if (numa_bitmask_isbitset(cpu, i)) {
+				ret = true;
+				break;
+			}
 		}
 	}
+	numa_free_cpumask(cpu);
 
-	return false; /* lets fall back to nocpus safely */
+	return ret;
 }
 
 static cpu_set_t bind_to_cpu(int target_cpu)
-- 
1.8.3.1