linux-kernel - Re: lockdep and threaded IRQs (was: ...)

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Message-ID: <20090303111353.5d9e4a8d@lxorguk.ukuu.org.uk>
Date:	Tue, 3 Mar 2009 11:13:53 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Brownell <david-b@...bell.net>,
	Andrew Morton <akpm@...ux-foundation.org>, me@...ipebalbi.com,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	felipe.balbi@...ia.com, dmitry.torokhov@...il.com,
	sameo@...nedhand.com, tglx@...utronix.de
Subject: Re: lockdep and threaded IRQs (was: ...)

> 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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