linux-kernel - Re: [PATCH v7 17/23] sched: Initial sched

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Date: Thu, 4 Jan 2024 21:22:10 -0800
From: John Stultz <jstultz@...gle.com>
To: Metin Kaya <metin.kaya@....com>
Cc: LKML <linux-kernel@...r.kernel.org>, Joel Fernandes <joelaf@...gle.com>, 
	Qais Yousef <qyousef@...gle.com>, Ingo Molnar <mingo@...hat.com>, 
	Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>, 
	Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>, 
	Valentin Schneider <vschneid@...hat.com>, Steven Rostedt <rostedt@...dmis.org>, 
	Ben Segall <bsegall@...gle.com>, Zimuzo Ezeozue <zezeozue@...gle.com>, 
	Youssef Esmat <youssefesmat@...gle.com>, Mel Gorman <mgorman@...e.de>, 
	Daniel Bristot de Oliveira <bristot@...hat.com>, Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>, 
	Boqun Feng <boqun.feng@...il.com>, "Paul E. McKenney" <paulmck@...nel.org>, 
	Xuewen Yan <xuewen.yan94@...il.com>, K Prateek Nayak <kprateek.nayak@....com>, 
	Thomas Gleixner <tglx@...utronix.de>, kernel-team@...roid.com
Subject: Re: [PATCH v7 17/23] sched: Initial sched_football test implementation

On Thu, Dec 28, 2023 at 7:19 AM Metin Kaya <metin.kaya@....com> wrote:
> On 20/12/2023 12:18 am, John Stultz wrote:
> > +static int __init test_sched_football_init(void)
> > +{
> > +     struct task_struct *kth;
> > +     int i;
> > +
> > +     players_per_team = num_online_cpus();
> > +
> > +     mutex_low_list = kmalloc_array(players_per_team,  sizeof(struct mutex), GFP_ATOMIC);
> > +     mutex_mid_list = kmalloc_array(players_per_team,  sizeof(struct mutex), GFP_ATOMIC);
> > +
> > +     for (i = 0; i < players_per_team; i++) {
> > +             mutex_init(&mutex_low_list[i]);
> > +             mutex_init(&mutex_mid_list[i]);
> > +     }
> > +
> > +     kth = create_fifo_thread(ref_thread, (void *)10, "ref-thread", 20);
> > +
> > +     return 0;
> > +}
> > +module_init(test_sched_football_init);
>
> Hit `modpost: missing MODULE_LICENSE() in
> kernel/sched/test_sched_football.o` error when I build this module.
>
> JFYI: the module does not have MODULE_NAME(), MODULE_DESCRIPTION(),
> MODULE_AUTHOR(), module_exit(), ... as well.

Good point. I've only been using it as a built-in.
Added all of those except for module_exit() for now, as I don't want
it to be unloaded while the kthreads are running.

thanks
-john