[PATCH v4 1/5] sched/topology: Add check to backup comment about hotplug lock

From: Juri Lelli
Date: Wed Jun 13 2018 - 08:18:36 EST

From: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>

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

Add an explicit check backing that comment, so to make it impossible
for anyone to miss the requirement.

Suggested-by: Juri Lelli <juri.lelli@xxxxxxxxxx>
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
[modified changelog]
Signed-off-by: Juri Lelli <juri.lelli@xxxxxxxxxx>
kernel/sched/topology.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 61a1125c1ae4..96eee22fafe8 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -1858,6 +1858,7 @@ void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
int i, j, n;
int new_topology;

+ lockdep_assert_cpus_held();

/* Always unregister in case we don't destroy any domains: */