linux-kernel - Re: [PATCH 0/8] git pull request for tip/tracing/core

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Date:	Wed, 11 Feb 2009 18:31:31 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Tony Luck <tony.luck@...el.com>, Mike Travis <travis@....com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 0/8] git pull request for tip/tracing/core


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Wed, 11 Feb 2009, Ingo Molnar wrote:
> > > 
> > > I just looked at alpha and arm, I'm now looking at ia64. And this could
> > > be an issue, since it has 14 bits for hard irqs.
> > > 
> > > What would be the impact to make the preempt count a long?
> > 
> > Assembly code has to be audited i guess, whether it's treated as an int anywhere. 
> > Should work i guess.
> 
> Before we go and make the change, Peter brought up a good point on IRC. Is 
> there any reason that ia64 needs 1 << 14 IRQs?  That's 16384!
> 
> Perhaps the better solution wolud be (if possible), to simply lower the 
> number of bits.

i'm the wrong person to be asked about that. (Cc:-ed the right people)

	Ingo
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