Date: Tue, 3 Mar 2009 11:13:53 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
       David Brownell <david-b@pacbell.net>,
       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
Subject: Re: lockdep and threaded IRQs (was: ...)
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Organization: None.. I'm free I'm free bwhahahahaha!
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> Hm, that reads like the boot IRQ erratas of certain chipsets - 
> the APIC could throw a fit essentially locking up the system. 
> FYI, we have fixes for that upstream already.

Good - certainly it used to be the case that masking APIC IRQs and
leaving them masked from the IRQ handled used to do funny things
sometimes.

> 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.)

IDE. A lot less people use the IDE stack nowdays but its a big item and
getting it wrong tends to eat your files.


I do object to the attitude shown about "forcing" people. It's a
community project built by a large number of people on a mix of
pragmatic and elegant design balances. Maybe it's just unfortunate choice
of wording but it is the wrong sentiment.
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