linux-kernel - Re: sched: exporting linux-rt migrate

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Message-ID: <20201215090520.609b76dc@gandalf.local.home>
Date:   Tue, 15 Dec 2020 09:05:20 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Mike Galbraith <efault@....de>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Orivej Desh <c@...vej.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-rt-users@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Brian Behlendorf <behlendorf1@...l.gov>
Subject: Re: sched: exporting linux-rt migrate_disable for ZFS

On Tue, 15 Dec 2020 04:19:23 +0100
Mike Galbraith <efault@....de> wrote:

> From 859a31c5ec958326dd046f4e41f6fa0db0ce98c3 Mon Sep 17 00:00:00 2001
> From: Steven Rostedt <srostedt@...hat.com>
> Date: Mon, 16 Apr 2012 21:51:54 -0400
> Subject: rt: Make migrate_disable/enable() and __rt_mutex_init non-GPL only
> 
> Modules that load on the normal vanilla kernel should also load on
> an -rt kernel as well. This does not mean we condone non-GPL modules,
> we are only being consistent.
> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

Yep,

Back in the day (like in 2005), we said that -rt should strive to work
wherever vanilla Linux works. Thus, if we add a symbol that replaces a non
GPL symbol, we need to keep that symbol non GPL.

-- Steve