linux-kernel - Re: [PATCH v2 RT 3.18] irq_work: Provide a soft-irq based queue

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Date:	Fri, 15 May 2015 09:43:14 +0200
From:	Jan Kiszka <jan.kiszka@....de>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	RT <linux-rt-users@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>
Subject: Re: [PATCH v2 RT 3.18] irq_work: Provide a soft-irq based queue

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@...mens.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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