linux-kernel - Re: [PATCH] sched/deadline: fix switching to -deadline

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Message-ID: <20170421101705.a34gmcbp727o7hgl@hirez.programming.kicks-ass.net>
Date:   Fri, 21 Apr 2017 12:17:05 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juri Lelli <juri.lelli@....com>
Cc:     luca abeni <luca.abeni@...tannapisa.it>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Claudio Scordino <claudio@...dence.eu.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tommaso Cucinotta <tommaso.cucinotta@...up.it>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: Re: [PATCH] sched/deadline: fix switching to -deadline

On Fri, Apr 21, 2017 at 10:47:29AM +0100, Juri Lelli wrote:

> Oh, I think it works "by coincidence", as ENQUEUE_RESTORE == DEQUEUE_SAVE
> == 0x02 ? :)

That's very much on purpose, also see:

#define DEQUEUE_SAVE            0x02 /* matches ENQUEUE_RESTORE */