linux-kernel - Re: [PATCH RT 1/3] rt: Move migrate

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Message-ID: <20140502153153.GG9178@linutronix.de>
Date:	Fri, 2 May 2014 17:31:53 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Carsten Emde <C.Emde@...dl.org>,
	John Kacur <jkacur@...hat.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Nicholas Mc Guire <der.herr@...r.at>,
	Clark Williams <williams@...hat.com>
Subject: Re: [PATCH RT 1/3] rt: Move migrate_disable up in trylocks

* Steven Rostedt | 2014-04-30 20:47:58 [-0400]:

>From: Steven Rostedt <rostedt@...dmis.org>
>
>The changes to move the migrate_disable() down in the trylocks()
>caused race conditions to appear in the cpu hotplug code. The
>migrate disables must be done before any of the rtmutexes are
>taken, otherwise a lock may be held that prevents hotplug from
>moving forward.
>
>Link: http://lkml.kernel.org/r/20140429201308.63292691@gandalf.local.home

Okay. I am taking a modified version (so it applies) of this into v3.14
tree. Mike also suggested to drop
migrate_disable-pushd-down-in-atomic_dec_and_spin_lo.patch because we
which is basicaly the some thing. And then we have
migrate_disable-pushd-down-in-rt_spin_trylock_irqsav.patch which we
could drop as well for the same reason.

Sebastian
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