From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Matt Cowell <matt.cowell@nsn.com>
Cc: ext Thomas Gleixner <tglx@linutronix.de>,
"linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>
Subject: Re: [PATCH RT] rtmutex: fix deadlock in spin_trylock
Date: Sat, 16 Nov 2013 14:12:48 +0100 [thread overview]
Message-ID: <20131116131248.GC11518@linutronix.de> (raw)
In-Reply-To: <527AA4FA.2000208@nsn.com>
* Matt Cowell | 2013-11-06 14:22:18 [-0600]:
>I see two ways to fix this:
>1) The way I did in the patch to ensure that spin_trylock never can
>spin on any locks internally.
>2) Converting the timer base lock to a raw_spinlock_t so that it
>actually disables hardirqs in lock_timer_base(). I don't think this
>would be a good idea though.
A third one has been applied where the waiter lock is taken with irqs
off. The thread "CONFIG_NO_HZ_FULL + CONFIG_PREEMPT_RT_FULL = nogo" has
a patch for that.
>
>Thanks,
>-Matt
Sebastian
prev parent reply other threads:[~2013-11-16 13:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-30 15:53 [PATCH RT] rtmutex: fix deadlock in spin_trylock Cowell, Matt (NSN - US/Arlington Heights)
2013-11-06 17:39 ` Thomas Gleixner
2013-11-06 20:22 ` Matt Cowell
2013-11-16 13:12 ` Sebastian Andrzej Siewior [this message]
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