linux-kernel - Re: [PATCH RT] locking/rtmutex: do lockdep before actual locking in rt_spin

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Message-ID: <20171011162010.izit6ycymwxqic6w@hirez.programming.kicks-ass.net>
Date:   Wed, 11 Oct 2017 18:20:10 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH RT] locking/rtmutex: do lockdep before actual locking in
 rt_spin_lock()

On Wed, Oct 11, 2017 at 06:16:46PM +0200, Sebastian Andrzej Siewior wrote:
> rt_spin_lock() should first do the lock annotation via lockdep and then
> do the actual locking. That way we learn about the deadlock from lockdep
> before it happens.

Yep, that's the right order.