linux-kernel - Re: [PATCH RT v2] timer: Raise softirq if there's irq

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Message-ID: <20140124153542.6a92ef27@gandalf.local.home>
Date:	Fri, 24 Jan 2014 15:35:42 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <williams@...hat.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	John Kacur <jkacur@...hat.com>,
	Mike Galbraith <bitbucket@...ine.de>,
	Joakim Hernberg <jbh@...hemy.lu>,
	Joe Korty <joe.korty@...r.com>,
	Muli Baron <muli.baron@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH RT v2] timer: Raise softirq if there's irq_work

On Fri, 24 Jan 2014 21:20:39 +0100
Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:

> * Steven Rostedt | 2014-01-24 15:09:33 [-0500]:
> 
> >[ Talking with Sebastian on IRC, it seems that doing the irq_work_run()
> >  from the interrupt in -rt is a bad thing. Here we simply raise the
> >  softirq if there's irq work to do. This too boots on my i7 ]
> 
> It is okay in general because most of the users should not run in bare
> interrupt context. The only exception here is the nohz_full_kick_work
> thing.
> 

I know we discussed this on IRC, but I wanted to publicly state that
the missing irq work callback was the RCU's rsp_wakeup() function.

-- Steve
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