linux-kernel - Re: ledtrig-cpu: Limit to 4 CPUs

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Message-ID: <20200920183401.GA21494@duo.ucw.cz>
Date:   Sun, 20 Sep 2020 20:34:01 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     linux-leds@...r.kernel.org, dmurphy@...com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: ledtrig-cpu: Limit to 4 CPUs

Hi!

> >    *
> >    * It can be bound to any LED just like other triggers using either a
> >    * board file or via sysfs interface.
> >    *
> >    * An API named ledtrig_cpu is exported for any user, who want to add CPU
> > - * activity indication in their code
> > + * activity indication in their code.
> >    *
> >    * Copyright 2011 Linus Walleij <linus.walleij@...aro.org>
> >    * Copyright 2011 - 2012 Bryan Wu <bryan.wu@...onical.com>
> > @@ -145,6 +149,9 @@ static int __init ledtrig_cpu_init(void)
> >   	for_each_possible_cpu(cpu) {
> >   		struct led_trigger_cpu *trig = &per_cpu(cpu_trig, cpu);
> > +		if (cpu > 4)
> 
> NACK. The workaround for this trigger was implemented for a reason -
> to make it working on platforms with arbitrary number of logical cpus.
> I've got 8, so I am discriminated now. Not saying, that it precludes
> trigger registration with no single line of warning.

Can I get details of your setup?

What CPU type that is, and how are you mapping CPU activity to LEDs?

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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