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@xxxxxxxxxxxxx>
AuthorDate: Fri, 09 Jun 2023 16:59:05 +02:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/core.c | 36 ++++++++++++++----------------------
1 file changed, 14 insertions(+), 22 deletions(-)
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;
}
/**
|