linux-kernel - Re: [ANNOUNCE] 3.18.7-rt2

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Date:	Thu, 26 Feb 2015 11:53:04 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Gustavo Bittencourt <gbitten@...il.com>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>, rostedt@...dmis.org,
	John Kacur <jkacur@...hat.com>
Subject: Re: [ANNOUNCE] 3.18.7-rt2

* Mike Galbraith | 2015-02-26 09:02:05 [+0100]:

>I found what was breaking my core2 lappy in 4.0-rt as well, namely the
4.0-rt? So you are a time traveler?

>locking, ww_mutex: fix ww_mutex vs self-deadlock
>
>If the caller already holds the mutex, task_blocks_on_rt_mutex()
>returns -EDEADLK, we proceed directly to rt_mutex_handle_deadlock()
>where it's instant game over.

The EDDEADLK / ELREADY seem to got broken duering the rtmutex rework.
Now I see:
| Wound/wait tests |
---------------------
                ww api failures:  ok  |  ok  |  ok  |
             ww contexts mixing:  ok  |  ok  |
           finishing ww context:  ok  |  ok  |  ok  |  ok  |
             locking mismatches:  ok  |  ok  |  ok  |
               EDEADLK handling:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
         spinlock nest unlocked:  ok  |

with no backtrace from the ww code which I haven't seen before that
patch. Applied.

Sebastian
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