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Message-ID: <20091130153223.0e510a9b@lxorguk.ukuu.org.uk>
Date: Mon, 30 Nov 2009 15:32:23 +0000
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: Russell King - ARM Linux <linux@....linux.org.uk>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Rusty Russell <rusty@...tcorp.com.au>,
David Brownell <dbrownell@...rs.sourceforge.net>,
Eric Miao <eric.y.miao@...il.com>,
Andrea Gallo <andrea.gallo@...ricsson.com>,
Peter Zijlstra <peterz@...radead.org>,
John Stultz <johnstul@...ibm.com>,
Nicolas Pitre <nico@...vell.com>,
Jamie Lokier <jamie@...reable.org>,
LKML <linux-kernel@...r.kernel.org>,
Remy Bohmer <linux@...mer.net>,
Hugh Dickins <hugh.dickins@...cali.co.uk>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>,
linux-arm-kernel@...ts.infradead.org
Subject: Re: Get rid of IRQF_DISABLED - (was [PATCH] genirq: warn about
IRQF_SHARED|IRQF_DISABLED)
On Mon, 30 Nov 2009 15:01:00 +0000
Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> On Mon, Nov 30, 2009 at 02:47:02PM +0000, Alan Cox wrote:
> > SHARED|DISABLED ought to WARN_ON() and if that doesn't motivate people
> > then return -EINVAL.
>
> That is an impossibility. There is hardware out there (AT91) where
> the timer interrupt is shared with other peripherals, and you end
> up with a mixture of irqs-disabled and irqs-enabled handlers sharing
> the same interrupt.
Well that will encourage people to fix it.
> My point is that if we outlaw irqs-disabled shared interrupts, it puts
> Atmel AT91 support into immediate difficulties.
If a driver disables the timer irq across a tick aren't you already in
trouble ?
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