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

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Date: Tue, 4 Jun 2024 11:27:59 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Metin Kaya <metin.kaya@....com>
Cc: Qais Yousef <qyousef@...alina.io>, Ingo Molnar <mingo@...nel.org>, Peter
 Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>,
 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 Mon, 3 Jun 2024 08:33:53 +0100
Metin Kaya <metin.kaya@....com> 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.

Agreed.

-- Steve