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

From: Steven Rostedt
Date: Mon Sep 26 2016 - 11:37:52 EST

On Mon, 26 Sep 2016 11:35:03 -0400
Steven Rostedt <rostedt@xxxxxxxxxxx> 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.

-- Steve