linux-kernel - Re: Get rid of IRQF_DISABLED - (was [PATCH] genirq: warn about IRQF_SHARED|IRQF

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Date:	Mon, 30 Nov 2009 15:24:40 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Nicolas Pitre <nico@...vell.com>,
	Eric Miao <eric.y.miao@...il.com>,
	John Stultz <johnstul@...ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Remy Bohmer <linux@...mer.net>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrea Gallo <andrea.gallo@...ricsson.com>,
	Jamie Lokier <jamie@...reable.org>,
	linux-arm-kernel@...ts.infradead.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: Get rid of IRQF_DISABLED - (was [PATCH] genirq: warn about
 IRQF_SHARED|IRQF_DISABLED)

On Mon, 30 Nov 2009, Peter Zijlstra wrote:
> On Mon, 2009-11-30 at 14:54 +0100, Thomas Gleixner wrote:
> > The correct solution IMNSHO is to get rid of IRQF_DISABLED and run
> > interrupt handlers always with interrupts disabled and require them
> > not to reenable interrupts themself.
> > 
> > Thoughts ?
> 
> I'm all for removing that brain damage:
> 
>   http://lkml.org/lkml/2009/3/2/33

Darn, I knew that we discussed that before, but my memory tricked me
into believing that it was years ago :)

> We should convert the broken hardware PIO and 3com interrupt things to
> threaded interrupts, and simply mandate all IRQ handlers run short and
> with IRQs disabled.

The ide stuff seems to be the only one which uses
local_irq_enable_in_hardirq() so that at least it tripped over lockdep
already.

What's the 3com wreckage about ?

> Except I guess that will upset some of the IRQ priority folks, like
> power, where they (iirc) have a stack per irq prio level.

Is that actually used ? Ben ?
 
> But its not like the core kernel knows about these nesting rules and can
> actually track any of that muck.

True.

	tglx
 
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