linux-kernel - Re: [PATCH] sched/deadline/rtmutex: Fix a PI crash for deadline tasks

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Message-ID: <20160405113233.GL3448@twins.programming.kicks-ass.net>
Date:	Tue, 5 Apr 2016 13:32:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	xlpang@...hat.com
Cc:	linux-kernel@...r.kernel.org, Juri Lelli <juri.lelli@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] sched/deadline/rtmutex: Fix a PI crash for deadline tasks

On Tue, Apr 05, 2016 at 06:48:38PM +0800, Xunlei Pang wrote:
> This is cool, I think we should also init "pi_task" properly for INIT_MUTEX and fork,
> otherwise looks good to me :-)

Indeed..

> Besides, do you think we can kill "pi_waiters_leftmost" from task_struct, as we
> can easily get it from "pi_waiters"?

I don't quickly see a way to do that, different locking rules govern the
two.. which was the whole problem we started with :/

> I will test it further with these new changes soon.

Thanks!