linux-kernel - [PATCH V3 01/10] sched/topology: Add check to backup comment about hotplug lock

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Date:   Tue, 13 Feb 2018 13:32:38 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     peterz@...radead.org
Cc:     lizefan@...wei.com, mingo@...hat.com, rostedt@...dmis.org,
        claudio@...dence.eu.com, bristot@...hat.com,
        tommaso.cucinotta@...tannapisa.it, juri.lelli@...hat.com,
        luca.abeni@...tannapisa.it, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH V3 01/10] sched/topology: Add check to backup comment about hotplug lock

The comment above function partition_sched_domains() clearly state that
the cpu_hotplug_lock should be held but doesn't mandate one to abide to
it.  Adding an explicit check backs that comment and make it impossible
for anyone to miss the requirement.

Suggested-by: Juri Lelli <juri.lelli@...hat.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 kernel/sched/topology.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 8010c2974d30..7c744c7425ec 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -1863,6 +1863,7 @@ void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
 	int i, j, n;
 	int new_topology;
 
+	lockdep_assert_cpus_held();
 	mutex_lock(&sched_domains_mutex);
 
 	/* Always unregister in case we don't destroy any domains: */
-- 
2.7.4