linux-kernel - Re: [RFC PATCH v2 05/25] sched/rt: Move some functions from rt.c to sched.h

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Message-ID: <aJ2jcIaHsKKFdUIL@jlelli-thinkpadt14gen4.remote.csb>
Date: Thu, 14 Aug 2025 10:50:56 +0200
From: Juri Lelli <juri.lelli@...hat.com>
To: Yuri Andriaccio <yurand2000@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org,
	Luca Abeni <luca.abeni@...tannapisa.it>,
	Yuri Andriaccio <yuri.andriaccio@...tannapisa.it>
Subject: Re: [RFC PATCH v2 05/25] sched/rt: Move some functions from rt.c to
 sched.h

Hi!

On 31/07/25 12:55, Yuri Andriaccio wrote:
> From: luca abeni <luca.abeni@...tannapisa.it>
> 
> Make the following functions be non-static and move them in sched.h, so that
> they can be used also in other source files:
> - rt_task_of()
> - rq_of_rt_rq()
> - rt_rq_of_se()
> - rq_of_rt_se()
> 
> There are no functional changes. This is needed by future patches.
> 
> Signed-off-by: luca abeni <luca.abeni@...tannapisa.it>
> Signed-off-by: Yuri Andriaccio <yurand2000@...il.com>
> ---
>  kernel/sched/rt.c    | 52 --------------------------------------------
>  kernel/sched/sched.h | 51 +++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 51 insertions(+), 52 deletions(-)
> 
> diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
> index 945e3d705cc..3ea92b08a0e 100644
> --- a/kernel/sched/rt.c
> +++ b/kernel/sched/rt.c
> @@ -168,34 +168,6 @@ static void destroy_rt_bandwidth(struct rt_bandwidth *rt_b)
>  
>  #define rt_entity_is_task(rt_se) (!(rt_se)->my_q)
>  
> -static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
> -{
> -	WARN_ON_ONCE(!rt_entity_is_task(rt_se));
> -
> -	return container_of(rt_se, struct task_struct, rt);
> -}
> -
> -static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
> -{
> -	/* Cannot fold with non-CONFIG_RT_GROUP_SCHED version, layout */
> -	WARN_ON(!rt_group_sched_enabled() && rt_rq->tg != &root_task_group);
> -	return rt_rq->rq;
> -}
> -
> -static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
> -{
> -	WARN_ON(!rt_group_sched_enabled() && rt_se->rt_rq->tg != &root_task_group);
> -	return rt_se->rt_rq;
> -}
> -
> -static inline struct rq *rq_of_rt_se(struct sched_rt_entity *rt_se)
> -{
> -	struct rt_rq *rt_rq = rt_se->rt_rq;
> -
> -	WARN_ON(!rt_group_sched_enabled() && rt_rq->tg != &root_task_group);
> -	return rt_rq->rq;
> -}

Looks like we are losing WARN_ON checks with the change? Why is that?

...

> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index a8073d0824d..a1e6d2852ca 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -3042,6 +3042,57 @@ extern void set_rq_offline(struct rq *rq);
>  
>  extern bool sched_smp_initialized;
>  
> +#ifdef CONFIG_RT_GROUP_SCHED
> +static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
> +{
> +#ifdef CONFIG_SCHED_DEBUG
> +	WARN_ON_ONCE(rt_se->my_q);
> +#endif

And gaining this one above. :)

Thanks,
Juri