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Message-ID: <20190416112235.GU11158@hirez.programming.kicks-ass.net>
Date:   Tue, 16 Apr 2019 13:22:35 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     hpa@...or.com, mingo@...nel.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, tglx@...utronix.de,
        john.ogness@...utronix.de, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched/core: Document that RT task priorities
 are 1...99

On Tue, Apr 16, 2019 at 11:47:27AM +0200, Sebastian Andrzej Siewior wrote:
> On 2019-04-16 11:36:34 [+0200], Peter Zijlstra wrote:
> > On Tue, Apr 16, 2019 at 01:13:11AM -0700, tip-bot for Sebastian Andrzej Siewior wrote:
> > > Commit-ID:  37a8f8590f307db8f8cfa62dfd82b3fc0978607c
> > > Gitweb:     https://git.kernel.org/tip/37a8f8590f307db8f8cfa62dfd82b3fc0978607c
> > > Author:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> > > AuthorDate: Wed, 3 Apr 2019 23:08:21 +0200
> > > Committer:  Ingo Molnar <mingo@...nel.org>
> > > CommitDate: Tue, 16 Apr 2019 10:06:08 +0200
> > > 
> > > sched/core: Document that RT task priorities are 1...99
> > > 
> > > John identified three files which claim that RT task priorities start at
> > > zero. As far as I understand, 0 is used for DL and has nothing to do
> > > wihich RT priorities as identified by the RT policy.
> > 
> > DL is -1, 0 is still very much FIFO/FF
> 
> but it can't be set. The lowest we can set is 1. Is this a bug then?

What cannot be set?

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