diff mbox series

[v5,2/5] sched/core: Streamlining calls to task_rq_unlock()

Message ID 20180903142801.20046-3-juri.lelli@redhat.com
State Superseded
Headers show
Series [v5,1/5] sched/topology: Adding function partition_sched_domains_locked() | expand

Commit Message

Juri Lelli Sept. 3, 2018, 2:27 p.m. UTC 
From: Mathieu Poirier <mathieu.poirier@linaro.org>


Calls to task_rq_unlock() are done several times in function
__sched_setscheduler().  This is fine when only the rq lock needs to be
handled but not so much when other locks come into play.

This patch streamlines the release of the rq lock so that only one
location need to be modified when dealing with more than one lock.

No change of functionality is introduced by this patch.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

---
 kernel/sched/core.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

-- 
2.17.1
diff mbox series

Patch

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index deafa9fe602b..22f5622cba69 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4232,8 +4232,8 @@  static int __sched_setscheduler(struct task_struct *p,
 	 * Changing the policy of the stop threads its a very bad idea:
 	 */
 	if (p == rq->stop) {
-		task_rq_unlock(rq, p, &rf);
-		return -EINVAL;
+		retval = -EINVAL;
+		goto unlock;
 	}
 
 	/*
@@ -4249,8 +4249,8 @@  static int __sched_setscheduler(struct task_struct *p,
 			goto change;
 
 		p->sched_reset_on_fork = reset_on_fork;
-		task_rq_unlock(rq, p, &rf);
-		return 0;
+		retval = 0;
+		goto unlock;
 	}
 change:
 
@@ -4263,8 +4263,8 @@  static int __sched_setscheduler(struct task_struct *p,
 		if (rt_bandwidth_enabled() && rt_policy(policy) &&
 				task_group(p)->rt_bandwidth.rt_runtime == 0 &&
 				!task_group_is_autogroup(task_group(p))) {
-			task_rq_unlock(rq, p, &rf);
-			return -EPERM;
+			retval = -EPERM;
+			goto unlock;
 		}
 #endif
 #ifdef CONFIG_SMP
@@ -4279,8 +4279,8 @@  static int __sched_setscheduler(struct task_struct *p,
 			 */
 			if (!cpumask_subset(span, &p->cpus_allowed) ||
 			    rq->rd->dl_bw.bw == 0) {
-				task_rq_unlock(rq, p, &rf);
-				return -EPERM;
+				retval = -EPERM;
+				goto unlock;
 			}
 		}
 #endif
@@ -4299,8 +4299,8 @@  static int __sched_setscheduler(struct task_struct *p,
 	 * is available.
 	 */
 	if ((dl_policy(policy) || dl_task(p)) && sched_dl_overflow(p, policy, attr)) {
-		task_rq_unlock(rq, p, &rf);
-		return -EBUSY;
+		retval = -EBUSY;
+		goto unlock;
 	}
 
 	p->sched_reset_on_fork = reset_on_fork;
@@ -4356,6 +4356,10 @@  static int __sched_setscheduler(struct task_struct *p,
 	preempt_enable();
 
 	return 0;
+
+unlock:
+	task_rq_unlock(rq, p, &rf);
+	return retval;
 }
 
 static int _sched_setscheduler(struct task_struct *p, int policy,