linux-kernel - Re: [RFC PATCH v3 04/24] sched/rt: Move some functions from rt.c to sched.h

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Message-ID: <aN6IR811AtfIUsWS@jlelli-thinkpadt14gen4.remote.csb>
Date: Thu, 2 Oct 2025 15:12:23 +0100
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 v3 04/24] sched/rt: Move some functions from rt.c to
 sched.h

Hello,

On 29/09/25 11:22, 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 | 54 ++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 54 insertions(+), 52 deletions(-)
> 
> diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
> index a7d063d2303..a599f63bf7f 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)

Do we want to move this macro as well, so that rt_task_of() doesn't need
to change?

> -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);
> -}

...

> +#ifdef CONFIG_RT_GROUP_SCHED
> +static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
> +{
> +	WARN_ON_ONCE(rt_se->my_q);
> +
> +	return container_of(rt_se, struct task_struct, rt);
> +}

Thanks,
Juri