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

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Message-ID: <20160412155149.GJ1087@worktop>
Date:	Tue, 12 Apr 2016 17:51:49 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	xlpang@...hat.com
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	Juri Lelli <juri.lelli@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] sched/deadline/rtmutex: Fix a PI crash for deadline tasks

On Tue, Apr 12, 2016 at 11:08:04AM +0800, Xunlei Pang wrote:
> I spotted another issue, we access pi_task without any lock in enqueue_task_dl(),

OK, so I'm on the road and entirely jetlagged, but how can
enqueue_task_dl() not have rq->lock held?