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sched/topology: Add partition_sched_domains_locked()

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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>
This commit is contained in:
Mathieu Poirier 2019-07-19 15:59:53 +02:00 committed by Ingo Molnar
parent 60e17f5cef
commit c22645f4c8
2 changed files with 23 additions and 4 deletions
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10
include/linux/sched/topology.h
View File

@ -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)

17
kernel/sched/topology.c
View File

@ -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);
}