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

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Message-ID: <19912883-8AB1-4DFD-A0E1-F23057785243@infradead.org>
Date:	Fri, 01 Apr 2016 15:12:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	xlpang@...hat.com, Xunlei Pang <xpang@...hat.com>
CC:	linux-kernel@...r.kernel.org, Juri Lelli <juri.lelli@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] sched/deadline/rtmutex: Fix a PI crash for deadline tasks



On 1 April 2016 14:23:58 CEST, Xunlei Pang <xpang@...hat.com> wrote:

>>> We need this iff lock owner has the deadline priority.
>> How is this deadline specific, those functions you modify are
>> deadline/rt agnostic.
>
>I checked the code, currently only deadline accesses the
>pi_waiters/pi_waiters_leftmost
>without pi_lock held via rt_mutex_get_top_task(), other cases all have
>pi_lock held.
>
>So adding the condition.

How does that not suggest fixing the deadline code?
-- 
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