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From: David Brownell <david-b@pacbell.net>
To: Ingo Molnar <mingo@elte.hu>
Subject: Re: lockdep and threaded IRQs (was: ...)
Date: Tue, 17 Mar 2009 18:04:39 -0700
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Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Andrew Morton <akpm@linux-foundation.org>, me@felipebalbi.com,
       linux-kernel@vger.kernel.org, linux-input@vger.kernel.org,
       felipe.balbi@nokia.com, dmitry.torokhov@gmail.com, sameo@openedhand.com,
       tglx@linutronix.de
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On Tuesday 03 March 2009, Ingo Molnar wrote:
> i think you severely over-estimate the importance and ratio of 
> drivers that enable irqs within irq handlers. (Nor does anyone 
> want to break them really - we want to have a sane default and 
> we want to flag the broken cases as broken.)

For the record, I've been running for some time now
with a patch that issues a warning for each IRQ that
lockdep forces to use IRQF_DISABLED.

On my x86 systems, pretty much every driver triggers
that warning.  Which makes me think maybe that shoe
is being placed on the wrong foot:  use of IRQF_DISABLED
is the *EXCEPTION* not the rule.  At least on one major
Linux platform...


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