linux-kernel - Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter

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Message-ID: <20160926154112.GH5016@twins.programming.kicks-ass.net>
Date:   Mon, 26 Sep 2016 17:41:12 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     mingo@...nel.org, tglx@...utronix.de, juri.lelli@....com,
        xlpang@...hat.com, bigeasy@...utronix.de,
        linux-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
        jdesfossez@...icios.com, bristot@...hat.com,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter

On Mon, Sep 26, 2016 at 11:37:27AM -0400, Steven Rostedt wrote:
> On Mon, 26 Sep 2016 11:35:03 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > Especially now that the code after the spin_unlock(&hb->lock) is now a
> > critical section (preemption is disable). There's nothing obvious in
> > futex.c that says it is.
> 
> Not to mention, this looks like it will break PREEMPT_RT as wake_up_q()
> calls sleepable spin locks.

What locks would that be?