From: Jan Kiszka <jan.kiszka@web.de>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: RT <linux-rt-users@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Mike Galbraith <umgwanakikbuti@gmail.com>
Subject: Re: [PATCH v2 RT 3.18] irq_work: Provide a soft-irq based queue
Date: Fri, 15 May 2015 09:43:14 +0200 [thread overview]
Message-ID: <5555A392.1050203@web.de> (raw)
In-Reply-To: <20150514195811.GJ13442@linutronix.de>
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On 2015-05-14 21:58, Sebastian Andrzej Siewior wrote:
> * Jan Kiszka | 2015-04-23 09:35:59 [+0200]:
>
>> Instead of turning all irq_work requests into lazy ones on -rt, just
>> move their execution from hard into soft-irq context.
>>
>> This resolves deadlocks of ftrace which will queue work from arbitrary
>> contexts, including those that have locks held that are needed for
>> raising a soft-irq.
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> Applied
The thread went on, and Mike suggested an alternative implementation [1]
that works fine and is even cleaner. Let's pick his.
Jan
[1] http://thread.gmane.org/gmane.linux.kernel/1937960
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prev parent reply other threads:[~2015-05-15 7:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-23 7:35 [PATCH v2 RT 3.18] irq_work: Provide a soft-irq based queue Jan Kiszka
2015-05-14 19:58 ` Sebastian Andrzej Siewior
2015-05-15 7:43 ` Jan Kiszka [this message]
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