Re: [RESEND][PATCH v31 1/9] sched/deadline: Ignore proxy-exec sched_yield()

[K Prateek Nayak]

On 8/11/2026 9:25 AM, K Prateek Nayak wrote:
> P.S. I dropped this patch and added the following on top of this
> series on top of tip:sched/core and nothing has crashed (yet):
> 
> diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
> index a3003b0f4522..797cb316fcd1 100644
> --- a/kernel/sched/deadline.c
> +++ b/kernel/sched/deadline.c
> @@ -101,7 +101,11 @@ static inline struct sched_dl_entity *pi_of(struct sched_dl_entity *dl_se)
>  
>  static inline bool is_dl_boosted(struct sched_dl_entity *dl_se)
>  {
> -	return false;
> +	struct dl_rq *dl_rq = dl_rq_of_se(dl_se);
> +	struct rq *rq = rq_of_dl_rq(dl_rq);
> +
> +	return sched_proxy_exec() && rq->donor != rq->curr && dl_task_of(dl_se) == rq->donor;
> +
>  }
>  #endif /* !CONFIG_RT_MUTEXES */
>  
> ---

Nevermind, I had CONFIG_RT_MUTEXES enabled and on doing:

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 97d6dc039e9b..909174e332ca 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -94,7 +94,7 @@ static inline bool is_dl_boosted(struct sched_dl_entity *dl_se)
 	struct dl_rq *dl_rq = dl_rq_of_se(dl_se);
 	struct rq *rq = rq_of_dl_rq(dl_rq);
 
-	return (pi_of(dl_se) != dl_se) || (sched_proxy_exec() && rq->donor != rq->curr && dl_task_of(dl_se) == rq->donor);
+	return (pi_of(dl_se) != dl_se) || (sched_proxy_exec() && rq->donor != rq->curr);
 }
 #else /* !CONFIG_RT_MUTEXES: */
 static inline struct sched_dl_entity *pi_of(struct sched_dl_entity *dl_se)
@@ -107,7 +107,7 @@ static inline bool is_dl_boosted(struct sched_dl_entity *dl_se)
 	struct dl_rq *dl_rq = dl_rq_of_se(dl_se);
 	struct rq *rq = rq_of_dl_rq(dl_rq);
 
-	return sched_proxy_exec() && rq->donor != rq->curr && dl_task_of(dl_se) == rq->donor;
+	return sched_proxy_exec() && rq->donor != rq->curr;
 
 }
 #endif /* !CONFIG_RT_MUTEXES */
---

I see only a bunch of SCHED_OTHER tasks proxying so clearly that doesn't
work but I think proxy should do something similar how rt_mutex handle
this under PI.

-- 
Thanks and Regards,
Prateek