sched/proxy: Yield the donor task

When executing a task in proxy context, handle yields as if they were
requested by the donor task. This matches the traditional PI semantics
of yield() as well.

This avoids scenario like proxy task yielding, pick next task selecting the
same previous blocked donor, running the proxy task again, etc.

Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202510211205.1e0f5223-lkp@intel.com
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Fernand Sieber <sieberf@amazon.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251106104022.195157-1-sieberf@amazon.com

5 files changed, 8 insertions, 7 deletions

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 6b8a9286e2fc..13112c680f92 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -2143,7 +2143,7 @@ static void yield_task_dl(struct rq *rq)
 	 * it and the bandwidth timer will wake it up and will give it
 	 * new scheduling parameters (thanks to dl_yielded=1).
 	 */
-	rq->curr->dl.dl_yielded = 1;
+	rq->donor->dl.dl_yielded = 1;
 
 	update_rq_clock(rq);
 	update_curr_dl(rq);
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index b063444dc003..224b72c8e8da 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -1474,7 +1474,7 @@ static bool dequeue_task_scx(struct rq *rq, struct task_struct *p, int deq_flags
 static void yield_task_scx(struct rq *rq)
 {
 	struct scx_sched *sch = scx_root;
-	struct task_struct *p = rq->curr;
+	struct task_struct *p = rq->donor;
 
 	if (SCX_HAS_OP(sch, yield))
 		SCX_CALL_OP_2TASKS_RET(sch, SCX_KF_REST, yield, rq, p, NULL);
@@ -1485,7 +1485,7 @@ static void yield_task_scx(struct rq *rq)
 static bool yield_to_task_scx(struct rq *rq, struct task_struct *to)
 {
 	struct scx_sched *sch = scx_root;
-	struct task_struct *from = rq->curr;
+	struct task_struct *from = rq->donor;
 
 	if (SCX_HAS_OP(sch, yield))
 		return SCX_CALL_OP_2TASKS_RET(sch, SCX_KF_REST, yield, rq,
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 273e2871b59e..f1d8eb350f59 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -8980,7 +8980,7 @@ static void put_prev_task_fair(struct rq *rq, struct task_struct *prev, struct t
  */
 static void yield_task_fair(struct rq *rq)
 {
-	struct task_struct *curr = rq->curr;
+	struct task_struct *curr = rq->donor;
 	struct cfs_rq *cfs_rq = task_cfs_rq(curr);
 	struct sched_entity *se = &curr->se;
 
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 1fd97f2d7ec6..f1867fe8e5c5 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1490,7 +1490,7 @@ static void requeue_task_rt(struct rq *rq, struct task_struct *p, int head)
 
 static void yield_task_rt(struct rq *rq)
 {
-	requeue_task_rt(rq, rq->curr, 0);
+	requeue_task_rt(rq, rq->donor, 0);
 }
 
 static int find_lowest_rq(struct task_struct *task);
diff --git a/kernel/sched/syscalls.c b/kernel/sched/syscalls.c
index 8f0f603b530b..807879131add 100644
--- a/kernel/sched/syscalls.c
+++ b/kernel/sched/syscalls.c
@@ -1319,7 +1319,7 @@ static void do_sched_yield(void)
 	rq = this_rq_lock_irq(&rf);
 
 	schedstat_inc(rq->yld_count);
-	current->sched_class->yield_task(rq);
+	rq->donor->sched_class->yield_task(rq);
 
 	preempt_disable();
 	rq_unlock_irq(rq, &rf);
@@ -1388,12 +1388,13 @@ EXPORT_SYMBOL(yield);
  */
 int __sched yield_to(struct task_struct *p, bool preempt)
 {
-	struct task_struct *curr = current;
+	struct task_struct *curr;
 	struct rq *rq, *p_rq;
 	int yielded = 0;
 
 	scoped_guard (raw_spinlock_irqsave, &p->pi_lock) {
 		rq = this_rq();
+		curr = rq->donor;
 
 again:
 		p_rq = task_rq(p);