[tip:sched/core] sched/topology: Add partition_sched_domains_locked()

[tip-bot for Mathieu Poirier <tipbot@zytor.com>]

Commit-ID:  c22645f4c8f021fb1c5e7189eb1f968132cc0844
Gitweb:     https://git.kernel.org/tip/c22645f4c8f021fb1c5e7189eb1f968132cc0844
Author:     Mathieu Poirier <mathieu.poirier@linaro.org>
AuthorDate: Fri, 19 Jul 2019 15:59:53 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 25 Jul 2019 15:51:57 +0200

sched/topology: Add partition_sched_domains_locked()

Introduce the partition_sched_domains_locked() function by taking
the mutex locking code out of the original function.  That way
the work done by partition_sched_domains_locked() can be reused
without dropping the mutex lock.

No change of functionality is introduced by this patch.

Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: bristot@redhat.com
Cc: claudio@evidence.eu.com
Cc: lizefan@huawei.com
Cc: longman@redhat.com
Cc: luca.abeni@santannapisa.it
Cc: rostedt@goodmis.org
Cc: tommaso.cucinotta@santannapisa.it
Link: https://lkml.kernel.org/r/20190719140000.31694-2-juri.lelli@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 include/linux/sched/topology.h | 10 ++++++++++
 kernel/sched/topology.c        | 17 +++++++++++++----
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h
index 7863bb62d2ab..f341163fedc9 100644
--- a/include/linux/sched/topology.h
+++ b/include/linux/sched/topology.h
@@ -150,6 +150,10 @@ static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
 	return to_cpumask(sd->span);
 }
 
+extern void partition_sched_domains_locked(int ndoms_new,
+					   cpumask_var_t doms_new[],
+					   struct sched_domain_attr *dattr_new);
+
 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
 				    struct sched_domain_attr *dattr_new);
 
@@ -194,6 +198,12 @@ extern void set_sched_topology(struct sched_domain_topology_level *tl);
 
 struct sched_domain_attr;
 
+static inline void
+partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
+			       struct sched_domain_attr *dattr_new)
+{
+}
+
 static inline void
 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
 			struct sched_domain_attr *dattr_new)
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 4eea2c9bc732..5a174ae6ecf3 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -2169,16 +2169,16 @@ static int dattrs_equal(struct sched_domain_attr *cur, int idx_cur,
  * ndoms_new == 0 is a special case for destroying existing domains,
  * and it will not create the default domain.
  *
- * Call with hotplug lock held
+ * Call with hotplug lock and sched_domains_mutex held
  */
-void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
-			     struct sched_domain_attr *dattr_new)
+void partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
+				    struct sched_domain_attr *dattr_new)
 {
 	bool __maybe_unused has_eas = false;
 	int i, j, n;
 	int new_topology;
 
-	mutex_lock(&sched_domains_mutex);
+	lockdep_assert_held(&sched_domains_mutex);
 
 	/* Always unregister in case we don't destroy any domains: */
 	unregister_sched_domain_sysctl();
@@ -2261,6 +2261,15 @@ match3:
 	ndoms_cur = ndoms_new;
 
 	register_sched_domain_sysctl();
+}
 
+/*
+ * Call with hotplug lock held
+ */
+void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
+			     struct sched_domain_attr *dattr_new)
+{
+	mutex_lock(&sched_domains_mutex);
+	partition_sched_domains_locked(ndoms_new, doms_new, dattr_new);
 	mutex_unlock(&sched_domains_mutex);
 }