linux-kernel - Re: [PATCH v4 2/2] sched/rt, dl: Convert functions to return bool

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Date: Tue, 4 Jun 2024 13:26:33 +0100
From: Qais Yousef <qyousef@...alina.io>
To: Metin Kaya <metin.kaya@....com>
Cc: Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v4 2/2] sched/rt, dl: Convert functions to return bool

On 06/03/24 08:33, Metin Kaya wrote:
> On 01/06/2024 10:33 pm, Qais Yousef wrote:
> > {rt, realtime, dl}_{task, prio}() functions return value is actually
> > a bool.  Convert their return type to reflect that.
> > 
> > Suggested-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> > Signed-off-by: Qais Yousef <qyousef@...alina.io>
> > ---
> >   include/linux/sched/deadline.h |  8 ++++----
> >   include/linux/sched/rt.h       | 16 ++++++++--------
> >   2 files changed, 12 insertions(+), 12 deletions(-)
> > 
> > diff --git a/include/linux/sched/deadline.h b/include/linux/sched/deadline.h
> > index 5cb88b748ad6..f2053f46f1d5 100644
> > --- a/include/linux/sched/deadline.h
> > +++ b/include/linux/sched/deadline.h
> > @@ -10,18 +10,18 @@
> >   #include <linux/sched.h>
> > -static inline int dl_prio(int prio)
> > +static inline bool dl_prio(int prio)
> >   {
> >   	if (unlikely(prio < MAX_DL_PRIO))
> > -		return 1;
> > -	return 0;
> > +		return true;
> > +	return false;
> 
> Nit: `return unlikely(prio < MAX_DL_PRIO)` would be simpler.
> The same can be applied to rt_prio() and realtime_prio(). This would make
> {dl, rt, realtime}_task() single-liner. Maybe further simplification can be
> done.

Fair. Thanks.

> 
> >   }
> >   /*
> >    * Returns true if a task has a priority that belongs to DL class. PI-boosted
> >    * tasks will return true. Use dl_policy() to ignore PI-boosted tasks.
> >    */
> > -static inline int dl_task(struct task_struct *p)
> > +static inline bool dl_task(struct task_struct *p)
> >   {
> >   	return dl_prio(p->prio);
> >   }
> > diff --git a/include/linux/sched/rt.h b/include/linux/sched/rt.h
> > index a055dd68a77c..efbdd2e57765 100644
> > --- a/include/linux/sched/rt.h
> > +++ b/include/linux/sched/rt.h
> > @@ -6,25 +6,25 @@
> >   struct task_struct;
> > -static inline int rt_prio(int prio)
> > +static inline bool rt_prio(int prio)
> >   {
> >   	if (unlikely(prio < MAX_RT_PRIO && prio >= MAX_DL_PRIO))
> > -		return 1;
> > -	return 0;
> > +		return true;
> > +	return false;
> >   }
> > -static inline int realtime_prio(int prio)
> > +static inline bool realtime_prio(int prio)
> >   {
> >   	if (unlikely(prio < MAX_RT_PRIO))
> > -		return 1;
> > -	return 0;
> > +		return true;
> > +	return false;
> >   }
> >   /*
> >    * Returns true if a task has a priority that belongs to RT class. PI-boosted
> >    * tasks will return true. Use rt_policy() to ignore PI-boosted tasks.
> >    */
> > -static inline int rt_task(struct task_struct *p)
> > +static inline bool rt_task(struct task_struct *p)
> >   {
> >   	return rt_prio(p->prio);
> >   }
> > @@ -34,7 +34,7 @@ static inline int rt_task(struct task_struct *p)
> >    * PI-boosted tasks will return true. Use realtime_task_policy() to ignore
> >    * PI-boosted tasks.
> >    */
> > -static inline int realtime_task(struct task_struct *p)
> > +static inline bool realtime_task(struct task_struct *p)
> >   {
> >   	return realtime_prio(p->prio);
> >   }
>