linux-kernel - Re: [PATCH 00/07] dyn_array/nr_irqs/sparse_irq support v10

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Date:	Fri, 15 Aug 2008 12:28:04 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/07] dyn_array/nr_irqs/sparse_irq support v10 - fix

On Fri, 2008-08-15 at 12:19 +0200, Ingo Molnar wrote:
> * Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> 
> > On Fri, 2008-08-15 at 11:35 +0200, Ingo Molnar wrote:
> > 
> > > looks wrong - it should be unconditional (i've done that via the patch 
> > > below). I dont remember why we made early_init_irq_lock_class() 
> > > dependent on CONFIG_TRACE_IRQFLAGS before. Peter, do you have any 
> > > memories?
> > 
> > Nope, git suggests I poke you about it.. :-)
> 
> muhaha - i dont even know that guy who did this sloppy commit 2 years 
> ago - "Ingo Molnar", or however he is called.
> 
> I believe my (mistaken) thinking would have been that desc->irq lockdep 
> class does not matter as long as we dont do irq-tracing. Which might 
> have been borderline correct then but is wrong now, for things like 
> lockstat?

/me pokes a bit at kconfig dependancies, and yes, it seems you're right
- lockstat doesn't require irq tracing..



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