diff mbox series

[tip:,sched/core] sched: Simplify sched_rr_get_interval()

Message ID 169461067174.27769.5481930955867667911.tip-bot2@tip-bot2
State New
Headers
Series [tip:,sched/core] sched: Simplify sched_rr_get_interval() |

Commit Message

tip-bot2 for Thomas Gleixner Sept. 13, 2023, 1:11 p.m. UTC 
  The following commit has been merged into the sched/core branch of tip:

Commit-ID:     af7c5763f5e8bc1b3f827354a283ccaf6a8c8098
Gitweb:        https://git.kernel.org/tip/af7c5763f5e8bc1b3f827354a283ccaf6a8c8098
Author:        Peter Zijlstra <peterz@infradead.org>
AuthorDate:    Fri, 09 Jun 2023 16:59:05 +02:00
Committer:     Ingo Molnar <mingo@kernel.org>
CommitterDate: Wed, 13 Sep 2023 15:01:33 +02:00

sched: Simplify sched_rr_get_interval()

Use guards to reduce gotos and simplify control flow.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/sched/core.c | 36 ++++++++++++++----------------------
 1 file changed, 14 insertions(+), 22 deletions(-)
diff mbox series

Patch

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 6c8c40a..d298176 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -9030,38 +9030,30 @@  SYSCALL_DEFINE1(sched_get_priority_min, int, policy)
 
 static int sched_rr_get_interval(pid_t pid, struct timespec64 *t)
 {
-	struct task_struct *p;
-	unsigned int time_slice;
-	struct rq_flags rf;
-	struct rq *rq;
+	unsigned int time_slice = 0;
 	int retval;
 
 	if (pid < 0)
 		return -EINVAL;
 
-	retval = -ESRCH;
-	rcu_read_lock();
-	p = find_process_by_pid(pid);
-	if (!p)
-		goto out_unlock;
+	scoped_guard (rcu) {
+		struct task_struct *p = find_process_by_pid(pid);
+		if (!p)
+			return -ESRCH;
 
-	retval = security_task_getscheduler(p);
-	if (retval)
-		goto out_unlock;
+		retval = security_task_getscheduler(p);
+		if (retval)
+			return retval;
 
-	rq = task_rq_lock(p, &rf);
-	time_slice = 0;
-	if (p->sched_class->get_rr_interval)
-		time_slice = p->sched_class->get_rr_interval(rq, p);
-	task_rq_unlock(rq, p, &rf);
+		scoped_guard (task_rq_lock, p) {
+			struct rq *rq = scope.rq;
+			if (p->sched_class->get_rr_interval)
+				time_slice = p->sched_class->get_rr_interval(rq, p);
+		}
+	}
 
-	rcu_read_unlock();
 	jiffies_to_timespec64(time_slice, t);
 	return 0;
-
-out_unlock:
-	rcu_read_unlock();
-	return retval;
 }
 
 /**